This subpart contains definitions, test procedures, and energy conservation requirements for pumps, pursuant to Part A-1 of Title III of the Energy Policy and Conservation Act, as amended, 42 U.S.C. 6311-6317.

The following definitions are applicable to this subpart, including appendices A, B, and C. In cases where definitions reference design intent, DOE will consider marketing materials, labels and certifications, and equipment design to determine design intent.

Adaptive pressure control means a pressure control that senses the head requirements in the system in which it is installed and adjusts the pump control curve accordingly.

Bare pump means a pump excluding mechanical equipment, driver, and controls.

Basic model means all units of a given class of pump manufactured by one manufacturer, having the same primary energy source, and having essentially identical electrical, physical, and functional (or hydraulic) characteristics that affect energy consumption, energy efficiency, water consumption, or water efficiency; and, in addition, for pumps that are subject to the test procedures specified in § 431.464(a), the following provisions also apply:

(1) All variations in numbers of stages of bare RSV and ST pumps must be considered a single basic model;

(2) Pump models for which the bare pump differs in impeller diameter and/or impeller trim, may be considered a single basic model; and

(3) Pump models for which the bare pump differs in number of stages and/or impeller diameter and which are sold with motors (or motors and controls) of varying horsepower may only be considered a single basic model if:

(i) For ESCC, ESFM, IL, and RSV pumps, each motor offered in the basic model has a nominal full load motor efficiency rated at the Federal minimum (see the applicable table at § 431.25) or the same number of bands above the Federal minimum for each respective motor horsepower (see table 3 of appendix A to this subpart); or for pumps sold with inverter-only synchronous electric motors, any number of bands above the Federal minimum for each respective motor horsepower provided that the rating is based on the lowest number of bands; or

(ii) For ST pumps, each motor offered in the basic model has a full load motor efficiency at the default nominal full load submersible motor efficiency shown in table 2 of appendix A to subpart Y of this part or the same number of bands above the default nominal full load submersible motor efficiency for each respective motor horsepower (see table 3 of appendix A to this subpart) or for inverter-only synchronous electric motors, any number of bands above the default nominal full load submersible motor efficiency provided the rating is based on the lowest number of bands.

Basket strainer means a perforated or otherwise porous receptacle, mounted within a housing on the suction side of a pump, that prevents solid debris from entering a pump. The basket strainer receptacle is capable of passing spherical solids of 1 mm in diameter, and can be removed by hand or using only simple tools (e.g., screwdriver, pliers, open-ended wrench).

Best efficiency point (BEP) means the pump hydraulic power operating point (consisting of both flow and head conditions) that results in the maximum efficiency.

Bowl means a casing in which the impeller rotates, and that directs flow axially to the next stage or the discharge column.

Bowl diameter means the maximum dimension of an imaginary straight line passing through and in the plane of the circular shape of the bowl of the bare pump that is perpendicular to the pump shaft and that intersects the outermost circular shape of the bowl of the bare pump at both of its ends.

Circulator-less-volute means a circulator pump distributed in commerce without a volute and for which a paired volute is also distributed in commerce. Whether a paired volute is distributed in commerce will be determined based on published data, marketing literature, and other publicly available information.

Circulator pump means is a pump that is either a wet rotor circulator pumps; a dry rotor, two-piece circulator pump; or a dry rotor, three-piece circulator pump. A circulator pump may be distributed in commerce with or without a volute.

Clean water pump means a pump that is designed for use in pumping water with a maximum non-absorbent free solid content of 0.016 pounds per cubic foot, and with a maximum dissolved solid content of 3.1 pounds per cubic foot, provided that the total gas content of the water does not exceed the saturation volume, and disregarding any additives necessary to prevent the water from freezing at a minimum of 14 °F.

Close-coupled pump means a pump in which the driver's bearings are designed to absorb the pump's axial load.

Continuous control means a control that adjusts the speed of the pump driver continuously over the driver operating speed range in response to incremental changes in the required pump flow, head, or power output.

Control means any device that can be used to operate the driver. Examples include, but are not limited to, continuous or non-continuous controls, schedule-based controls, on/off switches, and float switches.

Dedicated-purpose pool pump comprises self-priming pool filter pumps, non-self-priming pool filter pumps, waterfall pumps, pressure cleaner booster pumps, integral sand-filter pool pumps, integral-cartridge filter pool pumps, storable electric spa pumps, and rigid electric spa pumps.

Dedicated-purpose pool pump motor total horsepower means the product of the dedicated-purpose pool pump nominal motor horsepower and the dedicated-purpose pool pump service factor of a motor used on a dedicated-purpose pool pump based on the maximum continuous duty motor power output rating allowable for the motor's nameplate ambient rating and insulation class. (Dedicated-purpose pool pump motor total horsepower is also referred to in the industry as service factor horsepower or motor capacity.)

Dedicated-purpose pool pump service factor means a multiplier applied to the rated horsepower of a pump motor to indicate the percent above nameplate horsepower at which the motor can operate continuously without exceeding its allowable insulation class temperature limit.

Designed and marketed means that the equipment is designed to fulfill the indicated application and, when distributed in commerce, is designated and marketed for that application, with the designation on the packaging and any publicly available documents (e.g., product literature, catalogs, and packaging labels).

Driver means the machine providing mechanical input to drive a bare pump directly or through the use of mechanical equipment. Examples include, but are not limited to, an electric motor, internal combustion engine, or gas/steam turbine.

Dry rotor pump means a pump in which the motor rotor is not immersed in the pumped fluid.

Dry rotor, three-piece circulator pump means:

(1) A single stage, rotodynamic, single-axis flow, mechanically-coupled, dry rotor pump that:

(i) Has a rated hydraulic power less than or equal to 5 hp at the best efficiency point at full impeller diameter,

(ii) Is distributed in commerce with a horizontal motor, and

(iii) Discharges the pumped liquid through a volute in a plane perpendicular to the shaft.

(2) Examples include, but are not limited to, pumps generally referred to in industry as CP3.

Dry rotor, two-piece circulator pump means:

(1) A single stage, rotodynamic, single-axis flow, close-coupled, dry rotor pump that:

(i) Has a rated hydraulic power less than or equal to 5 hp at best efficiency point at full impeller diameter,

(ii) Is distributed in commerce with a horizontal motor, and

(iii) Discharges the pumped liquid through a volute in a plane perpendicular to the shaft.

(2) Examples include, but are not limited to, pumps generally referred to in industry as CP2.

End-suction close-coupled (ESCC) pump means a close-coupled, dry rotor, end-suction pump that has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and that is not a dedicated-purpose pool pump.

End-suction frame mounted/own bearings (ESFM) pump means a mechanically-coupled, dry rotor, end-suction pump that has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and that is not a dedicated-purpose pool pump.

End-suction pump means a single-stage, rotodynamic pump in which the liquid enters the bare pump in a direction parallel to the impeller shaft and on the side opposite the bare pump's driver-end. The liquid is discharged in a plane perpendicular to the shaft.

External input signal control means a variable speed drive that adjusts the speed of the driver in response to an input signal from an external logic and/or user interface.

Fire pump means a pump that is compliant with NFPA 20-2016 (incorporated by reference, see § 431.463), “Standard for the Installation of Stationary Pumps for Fire Protection,” and is either:

(1) UL listed under ANSI/UL 448-2013 (incorporated by reference, see § 431.463), “Standard for Safety Centrifugal Stationary Pumps for Fire-Protection Service,” or

(2) FM Global (FM) approved under the January 2015 edition of FM Class Number 1319, “Approval Standard for Centrifugal Fire Pumps (Horizontal, End Suction Type),” (incorporated by reference, see § 431.463).

Freeze protection control means a pool pump control that, at a certain ambient temperature, turns on the dedicated-purpose pool pump to circulate water for a period of time to prevent the pool and water in plumbing from freezing.

Full impeller diameter means the maximum diameter impeller with which a given pump basic model is distributed in commerce.

Header pump means a circulator pump distributed in commerce without a volute and for which a paired volute is not distributed in commerce. Whether a paired volute is distributed in commerce will be determined based on published data, marketing literature, and other publicly available information.

Horizontal motor means a motor, for which the motor shaft position when functioning under operating conditions specified in manufacturer literature, includes a horizontal position.

In-line (IL) pump means a pump that is either a twin head pump or a single-stage, single-axis flow, dry rotor, rotodynamic pump that has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter, in which liquid is discharged in a plane perpendicular to the shaft. Such pumps do not include circulator pumps.

Integral means a part of the device that cannot be removed without compromising the device's function or destroying the physical integrity of the unit.

Integral cartridge-filter pool pump means a pump that requires a removable cartridge filter, installed on the suction side of the pump, for operation; and the cartridge filter cannot be bypassed.

Integral sand-filter pool pump means a pump distributed in commerce with a sand filter that cannot be bypassed.

Magnet driven pump means a pump in which the bare pump is isolated from the motor via a containment shell and torque is transmitted from the motor to the bare pump via magnetic force. The motor shaft is not physically coupled to the impeller or impeller shaft.

Manual speed control means a control (variable speed drive and user interface) that adjusts the speed of the driver based on manual user input.

Mechanical equipment means any component of a pump that transfers energy from the driver to the bare pump.

Mechanically-coupled pump means a pump in which bearings external to the driver are designed to absorb the pump's axial load.

Multi-speed dedicated-purpose pool pump means a dedicated-purpose pool pump that is capable of operating at more than two discrete, pre-determined operating speeds separated by speed increments greater than 100 rpm, where the lowest speed is less than or equal to half of the maximum operating speed and greater than zero, and must be distributed in commerce with an on-board pool pump control (i.e., variable speed drive and user interface or programmable switch) that changes the speed in response to pre-programmed user preferences and allows the user to select the duration of each speed and/or the on/off times.

Non-continuous control means a control that adjusts the speed of a driver to one of a discrete number of non-continuous preset operating speeds, and does not respond to incremental reductions in the required pump flow, head, or power output.

Non-self-priming pool filter pump means a pool filter pump that is not certified under NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) to be self-priming and is not capable of re-priming to a vertical lift of at least 5.0 feet with a true priming time less than or equal to 10.0 minutes, when tested in accordance with section F of appendix B or C of this subpart, and is not a waterfall pump.

On-demand circulator pump means a circulator pump that is distributed in commerce with an integral control that:

(1) Initiates water circulation based on receiving a signal from the action of a user [of a fixture or appliance] or sensing the presence of a user of a fixture and cannot initiate water circulation based on other inputs, such as water temperature or a pre-set schedule.

(2) Automatically terminates water circulation once hot water has reached the pump or desired fixture.

(3) Does not allow the pump to operate when the temperature in the pipe exceeds 104 °F or for more than 5 minutes continuously.

Pool filter pump means an end suction pump that:

(1) Either:

(i) Includes an integrated basket strainer; or

(ii) Does not include an integrated basket strainer, but requires a basket strainer for operation, as stated in manufacturer literature provided with the pump; and

(2) May be distributed in commerce connected to, or packaged with, a sand filter, removable cartridge filter, or other filtration accessory, so long as the filtration accessory are connected with consumer-removable connections that allow the filtration accessory to be bypassed.

Pool pump timer means a pool pump control that automatically turns off a dedicated-purpose pool pump after a run-time of no longer than 10 hours.

Pressure cleaner booster pump means an end suction, dry rotor pump designed and marketed for pressure-side pool cleaner applications, and which may be UL listed under ANSI/UL 1081-2016 (incorporated by reference, see § 431.463).

Pressure control means a control (variable speed drive and integrated logic) that automatically adjusts the speed of the driver in response to pressure.

Prime-assist pump means a pump that:

(1) Is designed to lift liquid that originates below the centerline of the pump inlet;

(2) Requires no manual intervention to prime or re-prime from a dry-start condition; and

(3) Includes a device, such as a vacuum pump or air compressor and venturi eductor, to remove air from the suction line in order to automatically perform the prime or re-prime function at any point during the pump's operating cycle.

Pump means equipment designed to move liquids (which may include entrained gases, free solids, and totally dissolved solids) by physical or mechanical action and includes a bare pump and, if included by the manufacturer at the time of sale, mechanical equipment, driver, and controls.

Radially-split, multi-stage, horizontal, diffuser casing (RSH) pump means a horizontal, multi-stage, dry rotor, rotodynamic pump:

(1) That has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and at the number of stages required for testing;

(2) In which liquid is discharged in a plane perpendicular to the impeller shaft;

(3) For which each stage (or bowl) consists of an impeller and diffuser; and

(4) For which no external part of such a pump is designed to be submerged in the pumped liquid.

Radially-split, multi-stage, horizontal, end-suction diffuser casing (RSHES) pump means a RSH pump in which the liquid enters the bare pump in a direction parallel to the impeller shaft and on the side opposite the bare pump's driver-end.

Radially-split, multi-stage, horizontal, in-line diffuser casing (RSHIL) pump means a single-axis flow RSH pump in which the liquid enters the pump in a plane perpendicular to the impeller shaft.

Radially-split, multi-stage, vertical, diffuser casing (RSV) pump means a vertically suspended, multi-stage, single-axis flow, dry rotor, rotodynamic pump:

(1) That has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and at the number of stages required for testing;

(2) In which liquid is discharged in a plane perpendicular to the impeller shaft;

(3) For which each stage (or bowl) consists of an impeller and diffuser; and

(4) For which no external part of such a pump is designed to be submerged in the pumped liquid.

Removable cartridge filter means a filter component with fixed dimensions that captures and removes suspended particles from water flowing through the unit. The removable cartridge filter is not capable of passing spherical solids of 1 mm in diameter or greater, and can be removed from the filter housing by hand or using only simple tools (e.g., screwdrivers, pliers, open-ended wrench).

Rigid electric spa pump means an end suction pump that does not contain an integrated basket strainer or require a basket strainer for operation as stated in manufacturer literature provided with the pump and that meets the following three criteria:

(1) Is assembled with four through bolts that hold the motor rear endplate, rear bearing, rotor, front bearing, front endplate, and the bare pump together as an integral unit;

(2) Is constructed with buttress threads at the inlet and discharge of the bare pump; and

(3) Uses a casing or volute and connections constructed of a non-metallic material.

Rotodynamic pump means a pump in which energy is continuously imparted to the pumped fluid by means of a rotating impeller, propeller, or rotor.

Sand filter means a device designed to filter water through sand or an alternate sand-type media.

Self-priming pool filter pump means a pool filter pump that is certified under NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) to be self-priming or is capable of re-priming to a vertical lift of at least 5.0 feet with a true priming time less than or equal to 10.0 minutes, when tested in accordance with section F of appendix B or C of this subpart, and is not a waterfall pump.

Self-priming pump means a pump that either is a self-priming pool filter pump or a pump that:

(1) Is designed to lift liquid that originates below the centerline of the pump inlet;

(2) Contains at least one internal recirculation passage; and

(3) Requires a manual filling of the pump casing prior to initial start-up, but is able to re-prime after the initial start-up without the use of external vacuum sources, manual filling, or a foot valve.

Single axis flow pump means a pump in which the liquid inlet of the bare pump is on the same axis as the liquid discharge of the bare pump.

Single-speed dedicated-purpose pool pump means a dedicated-purpose pool pump that is capable of operating at only one speed.

Small vertical in-line (SVIL) pump means a small vertical twin-head pump or a single stage, single-axis flow, dry rotor, rotodynamic pump that:

(1) Has a shaft input power less than 1 horsepower at its BEP at full impeller diameter; and

(2) In which liquid is discharged in a plane perpendicular to the shaft; and

(3) Is not a circulator pump.

Small vertical twin-head pump means a dry rotor, single-axis flow, rotodynamic pump that contains two equivalent impeller assemblies, each of which:

(1) Contains an impeller, impeller shaft (or motor shaft in the case of close-coupled pumps), shaft seal or packing, driver (if present), and mechanical equipment (if present); and

(2) Has a shaft input power that is less than or equal to 1 hp at BEP and full impeller diameter; and

(3) Has the same primary energy source (if sold with a driver) and the same electrical, physical, and functional characteristics that affect energy consumption or energy efficiency; and

(4) Is mounted in its own volute; and

(5) Discharges liquid through its volute and the common discharge in a plane perpendicular to the impeller shaft.

Storable electric spa pump means a pump that is distributed in commerce with one or more of the following:

(1) An integral heater; and

(2) An integral air pump.

Submersible pump means a pump that is designed to be operated with the motor and bare pump fully submerged in the pumped liquid.

Submersible turbine (ST) pump means a single-stage or multi-stage, dry rotor, rotodynamic pump that is designed to be operated with the motor and stage(s) fully submerged in the pumped liquid; that has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and at the number of stages required for testing; and in which each stage of this pump consists of an impeller and diffuser, and liquid enters and exits each stage of the bare pump in a direction parallel to the impeller shaft.

Temperature control means a control (variable speed drive and integrated logic) that automatically adjusts the speed of the driver continuously over the driver operating speed range in response to temperature.

Twin head pump means a dry rotor, single-axis flow, rotodynamic pump that contains two impeller assemblies, which both share a common casing, inlet, and discharge, and each of which

(1) Contains an impeller, impeller shaft (or motor shaft in the case of close-coupled pumps), shaft seal or packing, driver (if present), and mechanical equipment (if present);

(2) Has a shaft input power that is greater than or equal to 1 hp and less than or equal to 200 hp at best efficiency point (BEP) and full impeller diameter;

(3) Has the same primary energy source (if sold with a driver) and the same electrical, physical, and functional characteristics that affect energy consumption or energy efficiency;

(4) Is mounted in its own volute; and

(5) Discharges liquid through its volute and the common discharge in a plane perpendicular to the impeller shaft.

Two-speed dedicated-purpose pool pump means a dedicated-purpose pool pump that is capable of operating at only two different pre-determined operating speeds, where the low operating speed is less than or equal to half of the maximum operating speed and greater than zero, and must be distributed in commerce either:

(1) With a pool pump control (e.g., variable speed drive and user interface or switch) that is capable of changing the speed in response to user preferences; or

(2) Without a pool pump control that has the capability to change speed in response to user preferences, but is unable to operate without the presence of such a pool pump control.

Variable-speed dedicated-purpose pool pump means a dedicated-purpose pool pump that is capable of operating at a variety of user-determined speeds, where all the speeds are separated by at most 100 rpm increments over the operating range and the lowest operating speed is less than or equal to one-third of the maximum operating speed and greater than zero. Such a pump must include a variable speed drive and be distributed in commerce either:

(1) With a user interface that changes the speed in response to pre-programmed user preferences and allows the user to select the duration of each speed and/or the on/off times; or

(2) Without a user interface that changes the speed in response to pre-programmed user preferences and allows the user to select the duration of each speed and/or the on/off times, but is unable to operate without the presence of a user interface.

Variable speed drive means equipment capable of varying the speed of the motor.

Vertical turbine (VT) pump means a vertically suspended, single-stage or multi-stage, dry rotor, single inlet, rotodynamic pump:

(1) That has a shaft input power greater than or equal to 1 hp and less than or equal to 200 hp at BEP and full impeller diameter and at the number of stages required for testing;

(2) For which the pump driver is not designed to be submerged in the pumped liquid;

(3) That has a single pressure containing boundary (i.e., is single casing), which may consist of, but is not limited, to bowls, columns, and discharge heads; and

(4) That discharges liquid through the same casing in which the impeller shaft is contained.

Waterfall pump means a pool filter pump with a certified maximum head less than or equal to 30.0 feet, and a maximum speed less than or equal to 1,800 rpm.

Wet rotor circulator pump means a single stage, rotodynamic, close-coupled, wet rotor pump. Examples include, but are not limited to, pumps generally referred to in industry as CP1.

[81 FR 4145, Jan. 25, 2016, as amended at 82 FR 5742, Jan. 18, 2017; 82 FR 36920, Aug. 7, 2017; 87 FR 57298, Sept. 19, 2022; 88 FR 17975, Mar. 24, 2023]

(a) Certain material is incorporated by reference into this subpart with the approval of the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that specified in this section, DOE must publish a document in the Federal Register and the material must be available to the public. All approved incorporation by reference (IBR) is available for inspection at DOE, and at the National Archives and Records Administration (NARA). Contact DOE at: the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Building Technologies Program, Sixth Floor, 950 L'Enfant Plaza SW, Washington, DC 20024, (202) 586-9127, [email protected], https://www.energy.gov/eere/buildings/building-technologies-office. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations.html or email [email protected]. The material may be obtained from the following sources:

(b) ASME. American Society of Mechanical Engineers, Two Park Avenue, New York, NY 10016-5990; (800) 843-2763; www.asme.org.

(1) ASME MFC-3M-2004 (Reaffirmed 2017) (“ASME MFC-3M-2004”), Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi, Issued January 1, 2004; IBR approved for appendix A to this subpart.

(2) ANSI/ASME MFC-5M-1985 (Reaffirmed 2006) (“ASME MFC-5M-1985”), Measurement of Liquid Flow in Closed Conduits Using Transit-Time Ultrasonic Flowmeters, Issued July 15, 1985; IBR approved for appendix A to this subpart.

(3) ASME MFC-8M-2001 (Reaffirmed 2011) (“ASME MFC-8M-2001”), Fluid Flow in Closed Conduits: Connections for Pressure Signal Transmissions Between Primary and Secondary Devices, Issued September 1, 2001; IBR approved for appendix A to this subpart.

(4) ASME MFC-12M-2006 (Reaffirmed 2014) (“ASME MFC-12M-2006”), Measurement of Fluid Flow in Closed Conduits Using Multiport Averaging Pitot Primary Elements, Issued October 9, 2006; IBR approved for appendix A to this subpart.

(5) ASME MFC-16-2014, Measurement of Liquid Flow in Closed Conduits with Electromagnetic Flowmeters, Issued March 14, 2014; IBR approved for appendix A to this subpart.

(6) ASME MFC-22-2007 (Reaffirmed 2014) (“ASME MFC-22-2007”), Measurement of Liquid by Turbine Flowmeters, Issued April 14, 2008; IBR approved for appendix A to this subpart.

(c) AWWA. American Water Works Association, Headquarters, 6666 W Quincy Ave, Denver, CO 80235; (303) 794-7711; www.awwa.org.

(1) ANSI/AWWA E103-2015 (“AWWA E103-2015”), Horizontal and Vertical Line-Shaft Pumps, approved 7, 2015; IBR approved for appendix A to this subpart.

(2) [Reserved]

(d) CSA. Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, L4W 5N6, Canada; (800) 463-6727; www.csagroup.org.

(1) CSA C390-10 Test methods, marking requirements, and energy efficiency levels for three-phase induction motors, Updated March 2010; IBR approved for appendix A to this subpart.

(2) CSA C747-2009 (Reaffirmed 2014) (“CSA C747-2009 (RA 2014)”), Energy efficiency test methods for small motors, CSA reaffirmed 2014; IBR approved for appendices B and C to this subpart, as follows:

(i) Section 1, “Scope”;

(ii) Section 3, “Definitions”;

(iii) Section 5, “General Test Requirements”; and

(iv) Section 6, “Test Method.”

(e) FM. FM Global, 1151 Boston-Providence Turnpike, P.O. Box 9102, Norwood, MA 02062; (781) 762-4300; www.fmglobal.com.

(1) FM Class Number 1319, Approval Standard for Centrifugal Fire Pumps (Horizontal, End Suction Type), January 2015; IBR approved for § 431.462.

(2) [Reserved]

(f) HI. Hydraulic Institute, 300 Interpace Parkway, 3rd Floor, Parsippany, NJ 07054-4406; 973-267-9700; www.Pumps.org.

(1) ANSI/HI 9.6.1-2017 (“HI 9.6.1-2017”) “Rotodynamic Pumps—Guideline for NPSH Margin, ANSI-approved January 6, 2017; IBR approved for appendix A to this subpart.

(2) ANSI/HI 9.6.6-2016 (“HI 9.6.6-2016”) “Rotodynamic Pumps for Pump Piping, ANSI-approved March 23, 2016; IBR approved for appendix A to this subpart.

(3) ANSI/HI 9.8-2018 (“HI 9.8-2018”) “Rotodynamic Pumps for Pump Intake Design, ANSI-approved January 8, 2018; IBR approved for appendix A to this subpart.

(4) ANSI/HI 14.1-14.2-2019 (“HI 14.1-14.2-2019”) “Rotodynamic Pumps for Nomenclature and Definitions, ANSI-approved April 9, 2019; IBR approved for appendix A to this subpart.

(5) HI 40.6-2014 (“HI 40.6-2014-B”), Methods for Rotodynamic Pump Efficiency Testing, copyright 2014, IBR approved for appendices B and C to this subpart, excluding the following:

(i) Section 40.6.4.1 “Vertically suspended pumps”;

(ii) Section 40.6.4.2 “Submersible pumps”;

(iii) Section 40.6.5.3 “Test report”;

(iv) Section 40.6.5.5 “Test conditions”;

(v) Section 40.6.5.5.2 “Speed of rotation during test”;

(vi) Section 40.6.6.1 “Translation of test results to rated speed of rotation”;

(vii) Appendix A “Test arrangements (normative)”: A.7 “Testing at temperatures exceeding 30 °C (86 °F)”; and

(viii) Appendix B, “Reporting of test results (normative)”).

(6) HI 40.6-2021, Hydraulic Institute Standard for Methods for Rotodynamic Pump Efficiency Testing, approved February 17, 2021; IBR approved for appendices A and D to this subpart.

(7) HI 41.5-2022, Hydraulic Institute Program Guideline for Circulator Pump Energy Rating Program, approved June 16, 2022; IBR approved for appendix D to this subpart.

(8) HI Engineering Data Book, Second Edition copyright 1990; IBR approved for appendix A to this subpart.

(g) IEEE. Institute of Electrical and Electronics Engineers, Inc., 45 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331; (732) 981-0060; www.ieee.org.

(1) IEEE 112-2017, IEEE Standard Test Procedure for Polyphase Induction Motors and Generators, published February 14, 2018; IBR approved for appendix A to this subpart.

(2) IEEE 113-1985, IEEE Guide: Test Procedures for Direct-Current Machines,” copyright 1985, IBR approved for appendices B and C to this subpart, as follows:

(i) Section 3, Electrical Measurements and Power Sources for all Test Procedures:

(A) Section 3.1, “Instrument Selection Factors”;

(B) Section 3.4 “Power Measurement”; and

(C) Section 3.5 “Power Sources”;

(ii) Section 4, Preliminary Tests:

(A) Section 4.1, Reference Conditions, Section 4.1.2, “Ambient Air”; and

(B) Section 4.1, Reference Conditions, Section 4.1.4 “Direction of Rotation”; and

(iii) Section 5, Performance Determination:

(A) Section 5.4, Efficiency, Section 5.4.1, “Reference Conditions”; and

(B) Section 5.4.3, Direct Measurements of Input and Output, Section 5.4.3.2 “Dynomometer or Torquemeter Method.”

(3) IEEE 114-2010 (“IEEE 114-2010-A”), IEEE Standard Test Procedure for Single-Phase Induction Motors, published December 23, 2010; IBR approved for appendix A to this subpart.

(4) IEEE 114-2010 (“IEEE 114-2010”), “IEEE Standard Test Procedure for Single-Phase Induction Motors,” approved September 30, 2010, IBR approved for appendices B and C to this subpart, as follows:

(i) Section 3, “General tests”, Section 3.2, “Tests with load”;

(ii) Section 4 “Testing facilities”; and

(iii) Section 5, “Measurements”:

(A) Section 5.2 “Mechanical measurements”;

(B) Section 5.3 “Temperature measurements”; and

(iv) Section 6 “Tests.”

(h) ISO. International Organization for Standardization, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland, +41 22 749 01 11. www.iso.org.

(1) ISO 1438:2017(E) (“ISO 1438:2017”), Hydrometry—Open channel flow measurement using thin-plate weirs, Third edition, April 2017; IBR approved for appendix A to this subpart.

(2) ISO 2186:2007(E) (“ISO 2186:2007”), Fluid flow in closed conduits—Connections for pressure signal transmissions between primary and secondary elements, Second edition, March 1, 2007; IBR approved for appendix A to this subpart.

(3) ISO 2715:2017(E) (“ISO 2715:2017”), Liquid hydrocarbons—Volumetric measurement by turbine flowmeter, Second edition, November 1, 2017; IBR approved for appendix A to this subpart.

(4) ISO 3354:2008(E) (“ISO 3354:2008”), Measurement of clean water flow in closed conduits—Velocity-area method using current-meters in full conduits and under regular flow conditions, Third edition, July 15, 2008; IBR approved for appendix A to this subpart.

(5) ISO 3966:2020(E) (“ISO 3966:2020”), Measurement of fluid flow in closed conduits—Velocity area method using Pitot static tubes, Third edition, July 27, 2020; IBR approved for appendix A to this subpart.

(6) ISO 5167-1:2003(E) (“ISO 5167-1:2003”), Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full—Part 1: General principles and requirements, Second edition, March 1, 2003; IBR approved for appendix A to this subpart.

(7) ISO 5198:1987(E) (“ISO 5198:1987”), Centrifugal, mixed flow and axial pumps—Code for hydraulic performance tests—Precision class, First edition, July 1, 1987; IBR approved for appendix A to this subpart.

(8) ISO 6416:2017(E) (“ISO 6416:2017”), Hydrometry—Measurement of discharge by the ultrasonic transit time (time of flight) method, Fourth edition, October 2017; IBR approved for appendix A to this subpart.

(9) ISO 20456:2017(E) (“ISO 20456:2017”), Measurement of fluid flow in closed conduits—Guidance for the use of electromagnetic flowmeters for conductive liquids, First edition, September 2017; IBR approved for appendix A to this subpart.

(i) NFPA. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471; (617) 770-3000; www.nfpa.org.

(1) NFPA 20 (“NFPA 20-2016”), Standard for the Installation of Stationary Pumps for Fire Protection, 2016 Edition, approved June 15, 2015, IBR approved for § 431.462.

(2) [Reserved]

(j) NSF. NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105; (743) 769-8010; www.nsf.org.

(1) NSF/ANSI 50-2015, Equipment for Swimming Pools, Spas, Hot Tubs and Other Recreational Water Facilities, Annex C, normative Test methods for the evaluation of centrifugal pumps, Section C.3, Self-priming capability, ANSI-approved January 26, 2015; IBR approved for § 431.462 and appendices B and C to this subpart.

(2) [Reserved]

(k) UL. UL, 333 Pfingsten Road, Northbrook, IL 60062; (847) 272-8800; www.ul.com.

(1) UL 448 (“ANSI/UL 448-2013”), Standard for Safety Centrifugal Stationary Pumps for Fire-Protection Service, 10th Edition, June 8, 2007, including revisions through July 12, 2013; IBR approved for § 431.462.

(2) UL 1081 (“ANSI/UL 1081-2016”), Standard for Swimming Pool Pumps, Filters, and Chlorinators, 7th Edition, ANSI-approved October 21, 2016; IBR approved for § 431.462.

[88 FR 17976, Mar. 24, 2023, as amended at 88 FR 24471, Apr. 21, 2023]

(a) General pumps—(1) Scope. This paragraph (a) provides the test procedures for determining the constant and variable load pump energy index for:

(i) The following categories of clean water pumps that have the characteristics listed in paragraph (a)(1)(iii) of this section.

(A) End suction close-coupled (ESCC);

(B) End suction frame mounted/own bearings (ESFM);

(C) In-line (IL);

(D) Radially split, multi-stage, vertical, in-line casing diffuser (RSV); and

(E) Submersible turbine (ST) pumps.

(ii) The additional following categories of clean water pumps that have the characteristics listed in paragraph (a)(1)(iii) of this section:

(A) Radially-split, multi-stage, horizontal, end-suction diffuser casing (RSHES);

(B) Radially-split, multi-stage, horizontal, in-line diffuser casing (RSHIL);

(C) Small vertical in-line (SVIL); and

(D) Vertical Turbine (VT).

(iii) Pump characteristics:

(A) Flow rate of 25 gpm or greater at BEP and full impeller diameter;

(B) Maximum head of 459 feet at BEP and full impeller diameter and the number of stages required for testing (see section 1.2.2 of appendix A of this subpart);

(C) Design temperature range wholly or partially in the range of 15 to 250 °F;

(D) Designed to operate with either:

(1) A 2- or 4- or 6-pole induction motor, or

(2) A non-induction motor with a speed of rotation operating range that includes speeds of rotation between 2,880 and 4,320 revolutions per minute (rpm) and/or 1,440 and 2,160 rpm and/or 960 and 1,439 revolutions per minute, and in each case, the driver and impeller must rotate at the same speed;

(E) For ST, and VT pumps, a 6-inch or smaller bowl diameter; and

(F) For ESCC, and ESFM pumps, a specific speed less than or equal to 5,000 when calculated using U.S. customary units.

(2) Testing and calculations. Determine the applicable constant load pump energy index (PEICL) or variable load pump energy index (PEIVL) using the test procedure set forth in appendix A of this subpart.

(b) Dedicated-purpose pool pumps—(1) Scope. This paragraph (b) provides the test procedures for determining the weighted energy factor (WEF), rated hydraulic horsepower, dedicated-purpose pool pump nominal motor horsepower, dedicated-purpose pool pump motor total horsepower, dedicated-purpose pool pump service factor, and other pump performance parameters for:

(i) The following varieties of dedicated-purpose pool pumps:

(A) Self-priming pool filter pumps;

(B) Non-self-priming pool filter pumps;

(C) Waterfall pumps; and

(D) Pressure cleaner booster pumps;

(ii) Served by single-phase or polyphase input power;

(iii) Except for:

(A) Submersible pumps; and

(B) Self-priming and non-self-priming pool filter pumps with hydraulic output power greater than or equal to 2.5 horsepower.

(2) Testing and calculations. Determine the weighted energy factor (WEF) using the test procedure set forth in appendix B or appendix C of this subpart, as applicable.

(c) Circulator pumps—(1) Scope. This paragraph (c) provides the test procedures for determining the circulator energy index for circulator pumps that are also clean water pumps, including on-demand circulator pumps and circulators-less-volute, and excluding submersible pumps and header pumps.

(2) Testing and calculations. Determine the circulator energy index (CEI) using the test procedure set forth in appendix D of this subpart Y.

[82 FR 36923, Aug. 7, 2017, as amended at 87 FR 57299, Sept. 19, 2022; 88 FR 17978, Mar. 24, 2023]

(a) For the purposes of paragraph (b) of this section, “PEICL” means the constant load pump energy index and “PEIVL” means the variable load pump energy index, both as determined in accordance with the test procedure in § 431.464. For the purposes of paragraph (c) of this section, “BEP” means the best efficiency point as determined in accordance with the test procedure in § 431.464.

(b) Each pump that is manufactured starting on January 27, 2020 and that:

(1) Is in one of the equipment classes listed in the table in paragraph (b)(4) of this section;

(2) Meets the definition of a clean water pump in § 431.462;

(3) Is not listed in paragraph (c) of this section; and

(4) Conforms to the characteristics listed in paragraph (d) of this section must have a PEICL or PEIVL rating of not more than 1.00 using the appropriate C-value in the table in this paragraph (b)(4):

(c) The energy efficiency standards in paragraph (b) of this section do not apply to the following pumps:

(1) Fire pumps;

(2) Self-priming pumps;

(3) Prime-assist pumps;

(4) Magnet driven pumps;

(5) Pumps designed to be used in a nuclear facility subject to 10 CFR part 50, “Domestic Licensing of Production and Utilization Facilities”;

(6) Pumps meeting the design and construction requirements set forth in Military Specification MIL-P-17639F, “Pumps, Centrifugal, Miscellaneous Service, Naval Shipboard Use” (as amended); MIL-P-17881D, “Pumps, Centrifugal, Boiler Feed, (Multi-Stage)” (as amended); MIL-P-17840C, “Pumps, Centrifugal, Close-Coupled, Navy Standard (For Surface Ship Application)” (as amended); MIL-P-18682D, “Pump, Centrifugal, Main Condenser Circulating, Naval Shipboard” (as amended); MIL-P-18472G, “Pumps, Centrifugal, Condensate, Feed Booster, Waste Heat Boiler, And Distilling Plant” (as amended). Military specifications and standards are available for review at http://everyspec.com/MIL-SPECS.

(d) The energy conservation standards in paragraph (b) of this section apply only to pumps that have the following characteristics:

(1) Flow rate of 25 gpm or greater at BEP at full impeller diameter;

(2) Maximum head of 459 feet at BEP at full impeller diameter and the number of stages required for testing;

(3) Design temperature range from 14 to 248 °F;

(4) Designed to operate with either:

(i) A 2- or 4-pole induction motor; or

(ii) A non-induction motor with a speed of rotation operating range that includes speeds of rotation between 2,880 and 4,320 revolutions per minute and/or 1,440 and 2,160 revolutions per minute; and

(iii) In either case, the driver and impeller must rotate at the same speed;

(5) For ST pumps, a 6-inch or smaller bowl diameter; and

(6) For ESCC and ESFM pumps, specific speed less than or equal to 5,000 when calculated using U.S. customary units.

(e) For the purposes of paragraph (f) of this section, “WEF” means the weighted energy factor and “hhp” means the rated hydraulic horsepower, as determined in accordance with the test procedure in § 431.464(b) and applicable sampling plans in § 429.59 of this chapter.

(f) Each dedicated-purpose pool pump that is not a submersible pump and is manufactured starting on July 19, 2021 must have a WEF rating that is not less than the value calculated from the following table:

(g) Each integral cartridge filter pool pump and integral sand filter pool pump that is manufactured starting on July 19, 2021 must be distributed in commerce with a pool pump timer that is either integral to the pump or a separate component that is shipped with the pump.

(h) For all dedicated-purpose pool pumps distributed in commerce with freeze protection controls, the pump must be shipped with freeze protection disabled or with the following default, user-adjustable settings:

(1) The default dry-bulb air temperature setting is no greater than 40 °F;

(2) The default run time setting shall be no greater than 1 hour (before the temperature is rechecked); and

(3) The default motor speed shall not be more than 1/2 of the maximum available speed.

(i) Each circulator pump that is manufactured starting on May 22, 2028 and that meets the criteria in paragraphs (i)(1) through (i)(2) of this section must have a circulator energy index (“CEI”) rating (as determined in accordance with the test procedure in § 431.464(c)(2)) of not more than 1.00 using the instructions in paragraph (i)(3) of this section and with a control mode as specified in paragraph (i)(4) of this section:

(1) Is a clean water pump as defined in § 431.462.

(2) Is not a submersible pump or a header pump, each as defined in § 431.462.

(3) The relationships in this paragraph (i)(3) are necessary to calculate maximum CEI.

(i) Calculate CEI according to the following equation:

Equation 1 to Paragraph (i)(3)(i) Where: CEI = the circulator energy index (dimensionless); CER = the circulator energy rating (hp), determined in accordance with section 6 of appendix D to subpart Y of part 431; and CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp), determined in accordance with paragraph (i)(3)(ii) of this section.

(ii) Calculate CERSTD according to the following equation:

Equation 2 to Paragraph (i)(3)(ii) Where: CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp); i = the index variable of the summation notation used to express CERSTD (dimensionless) as described in the table 3 to paragraph (i)(3)(ii), in which i is expressed as a percentage of circulator pump flow at best efficiency point, determined in accordance with the test procedure in § 431.464(c)(2); ωi = the weighting factor (dimensionless) at each corresponding test point, i, as described in table 3 to paragraph (i)(3)(ii); and Piin,STD = the reference power input to the circulator pump driver (hp) at test point i, calculated using the equations and method specified in paragraph (i)(3)(iii) of this section.

(iii) Calculate Piin,STD according to the following equation:

Equation 3 to Paragraph (i)(3)(iii) Where: Piin,STD = the reference power input to the circulator pump driver at test point i (hp); Pu,i = circulator pump basic model rated hydraulic horsepower (hp) determined in accordance with 10 CFR 429.59(a)(2)(i); αi = part-load efficiency factor (dimensionless) at each test point i as described in table 4 to paragraph (i)(3)(iii); and ηWTW,100% = reference circulator pump wire-to-water efficiency at best efficiency point (%) at the applicable energy conservation standard level, as described in table 5 to paragraph (i)(3)(iii) as a function of circulator pump basic model rated hydraulic horsepower at 100% BEP flow, Pu,100%.

(4) A circulator pump subject to energy conservation standards as described in this paragraph (i) must achieve the maximum CEI as described in paragraph (i)(3)(i) of this section and in accordance with the test procedure in § 431.464(c)(2) in the least consumptive control mode in which it is capable of operating.

[81 FR 4431, Jan. 26, 2016, as amended at 82 FR 5742, Jan. 18, 2017; 89 FR 44356, May 20, 2024]

(a) General pumps. For the pumps described in § 431.464(a), the following requirements apply to units manufactured on the same date that compliance is required with any applicable standards prescribed in § 431.465.

(1) Pump nameplate—(i) Required information. The permanent nameplate must be marked clearly with the following information:

(A) For bare pumps and pumps sold with electric motors but not continuous or non-continuous controls, the rated pump energy index—constant load (PEICL), and for pumps sold with motors and continuous or non-continuous controls, the rated pump energy index—variable load (PEIVL);

(B) The bare pump model number; and

(C) If transferred directly to an end-user, the unit's impeller diameter, as distributed in commerce. Otherwise, a space must be provided for the impeller diameter to be filled in.

(ii) Display of required information. All orientation, spacing, type sizes, typefaces, and line widths to display this required information must be the same as or similar to the display of the other performance data on the pump's permanent nameplate. The PEICL or PEIVL, as appropriate to a given pump model, must be identified in the form “PEICL ________” or “PEIVL ________.” The model number must be in one of the following forms: “Model ________” or “Model number ________” or “Model No. ________.” The unit's impeller diameter must be in the form “Imp. Dia. ________(in.).”

(2) Disclosure of efficiency information in marketing materials. (i) The same information that must appear on a pump's permanent nameplate pursuant to paragraph (a)(1)(i) of this section, must also be prominently displayed:

(A) On each page of a catalog that lists the pump; and

(B) In other materials used to market the pump.

(ii) [Reserved]

(b) Dedicated-purpose pool pumps. For the pumps described in § 431.464(b), the following requirements apply on the same date that compliance is required with any applicable standards prescribed in § 431.465.

(1) Pump nameplate—(i) Required information. The permanent nameplate must be marked clearly with the following information:

(A) The weighted energy factor (WEF); and

(B) The dedicated-purpose pool pump motor total horsepower.

(ii) Display of required information. All orientation, spacing, type sizes, typefaces, and line widths to display this required information must be the same as or similar to the display of the other performance data on the pump's permanent nameplate.

(A) The WEF must be identified in the form “WEF ________.”

(B) The dedicated-purpose pool pump motor total horsepower must be identified in one of the following forms: “Dedicated-purpose pool pump motor total horsepower __________,” “DPPP motor total horsepower __________,” “motor total horsepower __________,” “motor THP __________,” or “THP __________.”

(2) [Reserved]

[82 FR 36923, Aug. 7, 2017]

Note: Prior to September 20, 2023, representations with respect to the energy use or efficiency (including compliance certifications) of pumps specified in § 431.464(a)(1)(i), excluding pumps listed in § 431.464(a)(1)(iv), must be based on testing conducted in accordance with the applicable provisions of this appendix as they appeared in the January 1, 2022 edition of the Code of Federal Regulations of subpart Y of part 431 in 10 CFR parts 200 through 499.

On or after September 20, 2023, representations with respect to the energy use or efficiency (including compliance certifications) of pumps specified in § 431.464(a)(1)(i), excluding pumps listed in § 431.464(a)(1)(iv), must be based on testing conducted in accordance with the applicable provisions of this appendix.

Any representations with respect to the energy use or efficiency of pumps specified in § 431.464(a)(1)(ii), excluding pumps listed in § 431.464(a)(1)(iv), made on or after September 20, 2023 must be made in accordance with the results of testing pursuant to this appendix. Manufacturers must use the results of testing under this appendix to determine compliance with any energy conservation standards established for pumps specified in § 431.464(a)(1)(ii), excluding pumps listed in § 431.464(a)(1)(iv), that are published after January 1, 2022.

I. Test Procedure for Pumps

0. Incorporation by Reference.

DOE incorporated by reference in § 431.463 the entire standard for HI 40.6-2021, HI 9.6.1-2017, HI 9.6.6-2016, HI 9.8-2018, HI 14.1-14.2-2019, the HI Engineering Data Book, ASME MFC-5M-1985, ASME MFC-3M-2004, ASME MFC-8M-2001, ASME MFC-12M-2006, ASME MFC-16-2014, ASME MFC-22-2007, AWWA E103-2015, CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, ISO 1438:2017, ISO 2186:2007, ISO 2715:2017, ISO 3354:2008, ISO 3966:2020, ISO 5167-1:2003, ISO 5198:1987, ISO 6416:2017, and ISO 20456:2017; however, certain enumerated provisions of HI 40.6-2021, as follows are inapplicable. To the extent that there is a conflict between the terms or provisions of a referenced industry standard and the CFR, the CFR provisions control.

0.1 HI 40.6-2021

(a) Section 40.6.1 Scope

(b) Section 40.6.5.3 Test report

(c) Appendix B Reporting of test results (informative)

(d) Appendix E Testing Circulator Pumps (normative)

(e) Appendix G DOE Compared to HI 40.6 Nomenclature

0.2 [Reserved]

A. General. To determine the constant load pump energy index (PEICL) for bare pumps and pumps sold with electric motors or the variable load pump energy index (PEIVL) for pumps sold with electric motors and continuous or non-continuous controls, perform testing in accordance with HI 40.6-2021, except section 40.6.5.3, “Test report”, including the applicable provisions of HI 9.6.1-2017, HI 9.6.6-2016, HI 9.8-2018, HI 14.1-14.2-2019, the HI Engineering Data Book, ASME MFC-3M-2004, ASME MFC-5M-1985, ASME MFC-8M-2001, ASME MFC-12M-2006, ASME MFC-16-2014, ASME MFC-22-2007, AWWA E103-2015, CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, ISO 1438:2017, ISO 2186:2007, ISO 2715:2017, ISO 3354:2008, ISO 3966:2020, ISO 5167-1:2003, ISO 5198:1987, ISO 6416:2017, and ISO 20456:2017, as referenced in HI 40.6, with the modifications and additions as noted throughout the provisions below. Where HI 40.6-2021 refers to “pump,” the term refers to the “bare pump,” as defined in § 431.462. Also, for the purposes of applying this appendix, the term “volume per unit time,” as defined in section 40.6.2, “Terms and definitions,” of HI 40.6-2021 shall be deemed to be synonymous with the term “flow rate” used throughout that standard and this appendix. In addition, the specifications in section 40.6.4.1 of HI 40.6-2021, “Vertically suspended pumps,” do not apply to ST pumps and the performance of ST bare pumps considers bowl performance only. However, the specifications in the first paragraph of section 40.6.4.1 of HI 40.6-2021 (including the applicable provisions of HI 14.1-14.2-2019, the HI Engineering Data Book, and AWWA E103-2015, as referenced in section 40.6.4.1 of HI 40.6), “Vertically suspended pumps,” do apply to VT pumps and the performance of VT bare pumps considers bowl performance only.

A.1 Scope. Section II of this appendix applies to all pumps and describes how to calculate the pump energy index (section II.A) based on the pump energy rating for the minimally-compliant reference pump (PERSTD; section II.B) and the constant load pump energy rating (PERCL) or variable load pump energy rating (PERVL) determined in accordance with one of sections III through VII of this appendix, based on the configuration in which the pump is distributed in commerce and the applicable testing method specified in sections III through VII and as described in Table 1 of this appendix.

A.2 Section III of this appendix addresses the test procedure applicable to bare pumps. This test procedure also applies to pumps sold with drivers other than motors and ESCC, ESFM, IL, RSHES, RSHIL, RSV, ST, and VT pumps sold with single-phase induction motors.

A.3 Section IV of this appendix addresses the testing-based approach for pumps sold with motors, which applies to all pumps sold with electric motors, except for pumps sold with inverter-only synchronous electric motors, but including pumps sold with single-phase induction motors. This test procedure also applies to pumps sold with controls other than continuous or non-continuous controls (e.g., on/off switches).

A.4 Section V of this appendix addresses the calculation-based approach for pumps sold with motors, which applies to:

A.4.1 Pumps sold with polyphase electric motors regulated by DOE's energy conservation standards for electric motors at § 431.25(g), and

A.4.2 SVIL pumps sold with small electric motors regulated by DOE's energy conservation standards at § 431.446 or sold with SNEMs regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part but including motors of such varieties that are less than 0.25 hp, and

A.4.3 Pumps sold with submersible motors.

A.5 Section VI of this appendix addresses the testing-based approach for pumps sold with motors and controls, which applies to all pumps sold with electric motors (including single-phase induction motors) and continuous or non-continuous controls and to pumps sold with inverter-only synchronous electric motors with or without controls.

A.6 Section VII of this appendix discusses the calculation-based approach for pumps sold with motors and controls, which applies to:

A.6.1 Pumps sold with polyphase electric motors regulated by DOE's energy conservation standards for electric motors at § 431.25(g) and continuous controls and

A.6.2 Pumps sold with inverter-only synchronous electric motors regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part,

A.6.3 SVIL pumps sold with small electric motors regulated by DOE's energy conservation standards at § 431.446 (but including motors of such varieties that are less than 0.25 hp) and continuous controls or with SNEMs regulated by DOE's test procedure and/or energy conservation standards at subpart B of this part (but including motors of such varieties that are less than 0.25 hp) and continuous controls, and

A.6.4 Pumps sold with submersible motors and continuous controls.

B. Measurement Equipment.

B.1 Instrument Accuracy. For the purposes of measuring pump power input, driver power input to the motor or controls, and pump power output, the equipment specified in HI 40.6-2021 Appendix C (including the applicable provisions of ASME MFC-5M-1985, ASME MFC-3M-2004, ASME MFC-8M-2001, ASME MFC-12M-2006, ASME MFC-16-2014, ASME MFC-22-2007, CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, ISO 1438:2017, ISO 2186:2007, ISO 2715:2017, ISO 3354:2008, ISO 3966:2020, ISO 5167-1:2003, ISO 5198:1987, ISO 6416:2017, and ISO 20456:2017, as referenced in Appendix C of HI 40.6) necessary to measure head, speed of rotation, flow rate, temperature, torque, and electrical power must be used and must comply with the stated accuracy requirements in HI 40.6-2021 Table 40.6.3.2.3 except as noted in sections III.B, IV.B, V.B, VI.B, and VII.B of this appendix. When more than one instrument is used to measure a given parameter, the combined accuracy, calculated as the root sum of squares of individual instrument accuracies, must meet the specified accuracy requirements.

B.2 Calibration. Calibration requirements for instrumentation are specified in Appendix D of HI 40.6-2021.

C. Test Conditions. Conduct testing at full impeller diameter in accordance with the test conditions, stabilization requirements, and specifications of HI 40.6-2021 Section 40.6.3, “Pump efficiency testing;” Section 40.6.4, “Considerations when determining the efficiency of certain pumps” including the applicable provisions of HI 14.1-14.2-2019, the HI Engineering Data Book, and AWWA E103-2015, as referenced in section 40.6.4 of HI 40.6; section 40.6.5.4 (including appendix A), “Test arrangements,” including the applicable provisions of HI 9.6.1-2017, HI 9.6.6-2016, HI 9.8-2018, HI Engineering Data Book, and AWWA E103-2015 as referenced in appendix A of HI 40.6; and section 40.6.5.5, “Test conditions” including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6-2021. For ST pumps, head measurements must be based on the bowl assembly total head as described in section A.5 of 40.6-2021, including the applicable provisions of the HI Engineering Data Book and AWWA E103-2015 as referenced in ins section A.5 of HI 40.6-2021, and the pump power input or driver power input, as applicable, must be based on the measured input power to the driver or bare pump, respectively; section 40.6.4.1, “Vertically suspended pumps,” does not apply to ST pumps.

C.1 Nominal Speed of Rotation. Determine the nominal speed of rotation based on the range of speeds of rotation at which the pump is designed to operate, in accordance with sections I.C.1.1, I.C.1.2, and I.C.1.3 of this appendix, as applicable. When determining the range of speeds at which the pump is designed to operate, DOE will refer to published data, marketing literature, and other publicly-available information about the pump model and motor, as applicable.

C.1.1 For pumps sold without motors, select the nominal speed of rotation based on the speed for which the pump is designed.

C.1.1.1 For bare pumps designed for speeds of rotation including 2,880 to 4,320 revolutions per minute (rpm), the nominal speed of rotation shall be 3,600 rpm.

C.1.1.2 For bare pumps designed for speeds of rotation including 1,440 to 2,160 rpm, the nominal speed of rotation shall be 1,800 rpm.

C.1.1.3 For bare pumps designed for speeds of rotation including 960 to 1,439 rpm, the nominal speed of rotation shall be 1,200 rpm.

C.1.2 For pumps sold with induction motors, select the appropriate nominal speed of rotation.

C.1.2.1 For pumps sold with 6-pole induction motors, the nominal speed of rotation shall be 1,200 rpm.

C.1.2.2 For pumps sold with 4-pole induction motors, the nominal speed of rotation shall be 1,800 rpm.

C.1.2.3 For pumps sold with 2-pole induction motors, the nominal speed of rotation shall be 3,600 rpm.

C.1.3 For pumps sold with non-induction motors, select the appropriate nominal speed of rotation.

C.1.3.1 Where the operating range of the pump and motor includes speeds of rotation between 2,880 and 4,320 rpm, the nominal speed of rotation shall be 3,600 rpm.

C.1.3.2 Where the operating range of the pump and motor includes speeds of rotation between 1,440 and 2,160 rpm, the nominal speed of rotation shall be 1,800 rpm.

C.1.3.3 Where the operating range of the pump and motor includes speeds of rotation between 960 and 1,439, the nominal speed of rotation shall be 1,200 rpm.

C.2 Multi-Stage Pumps. Perform testing on the pump with three stages for RSH and RSV pumps, and nine stages for ST and VT pumps. If the basic model of pump being tested is only available with fewer than the required number of stages, test the pump with the maximum number of stages with which the basic model is distributed in commerce in the United States. If the basic model of pump being tested is only available with greater than the required number of stages, test the pump with the lowest number of stages with which the basic model is distributed in commerce in the United States. If the basic model of pump being tested is available with both fewer and greater than the required number of stages, but not the required number of stages, test the pump with the number of stages closest to the required number of stages. If both the next lower and next higher number of stages are equivalently close to the required number of stages, test the pump with the next higher number of stages.

C.3 Twin-Head Pumps. For twin-head pumps, perform testing on an equivalent single impeller IL or SVIL pump as applicable, constructed by incorporating one of the driver and impeller assemblies of the twin-head pump being rated into an adequate IL-style or SVIL-style, single impeller volute and casing. An adequate IL-style or SVIL-style, single impeller volute and casing means a volute and casing for which any physical and functional characteristics that affect energy consumption and energy efficiency are the same as their corresponding characteristics for a single impeller in the twin-head pump volute and casing.

D. Data Collection and Analysis.

D.1 Damping Devices. Use of damping devices, as described in section 40.6.3.2.2 of HI 40.6-2021, are only permitted to integrate up to the data collection interval used during testing.

D.2 Stabilization. Record data at any tested load point only under stabilized conditions, as defined in HI 40.6-2021 section 40.6.5.5.1, including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6, where a minimum of two measurements are used to determine stabilization.

D.3 Calculations and Rounding. Normalize all measured data to the nominal speed of rotation of 3,600 or 1,800 or 1,200 rpm based on the nominal speed of rotation selected for the pump in section I.C.1 of this appendix, in accordance with the procedures specified in section 40.6.6.1.1 of HI 40.6-2021. Except for the “expected BEP flow rate,” all terms and quantities refer to values determined in accordance with the procedures set forth in this appendix for the rated pump. Perform all calculations using raw measured values without rounding. Round PER CL and PER VL to three significant digits, and round PEI CL, and PEI VL values, as applicable, to the hundredths place (i.e., 0.01).

D.4 Pumps with BEP at Run Out. Test pumps for which the expected BEP corresponds to a volume rate of flow that is within 20 percent of the expected maximum flow rate at which the pump is designed to operate continuously or safely (i.e., pumps with BEP at run-out) in accordance with the test procedure specified in this appendix, but with the following exceptions:

D.4.1 Use the following seven flow points—40, 50, 60, 70, 80, 90, and 100 percent of the expected maximum flow rate for determination of BEP in sections III.D, IV.D, V.D, VI.D, and VII.D of this appendix instead of the flow points specified in those sections.

D.4.2 Use flow points of 60, 70, 80, 90, and 100 percent of the expected maximum flow rate of the pump to determine pump power input or driver power input instead of the flow points of 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate specified in sections III.E.1.1, IV.E.1, V.E.1.1, VI.E.1, and VII.E.1.1 of this appendix.

D.4.3 To determine PER CL in sections III.E, IV.E, and V.E and to determine PER STD in section II.B, use load points of 65, 90, and 100 percent of the BEP flow rate determined with the modified flow points specified in this section I.D.4 of this appendix instead of 75, 100, and 110 percent of BEP flow. In section II.B.1.1, where alpha values are specified for the load points 75, 100, and 110 percent of BEP flow rate, instead apply the alpha values to the load points of 65, 90, and 100 percent of the BEP flow rate determined with the modified flow points specified in this section I.D.4 of this appendix. However, in sections II.B.1.1.1 and II.B.1.1.1.1 of this appendix, use 100 percent of the BEP flow rate as specified to determine ηpump,STD and Ns as specified. To determine motor sizing for bare pumps in sections II.B.1.2.1.1 and III.E.1.2.1.1 of this appendix, use a load point of 100 percent of the BEP flow rate instead of 120 percent.

II. Calculation of the Pump Energy Index

A. Determine the PEI of each tested pump based on the configuration in which it is sold, as follows:

A.1. For pumps rated as bare pumps or pumps sold with motors (other than inverter-only synchronous electric motors), determine the PEI CL using the following equation:

Where: PEI CL = the pump energy index for a constant load (hp), PER CL = the pump energy rating for a constant load (hp), determined in accordance with either section III (for bare pumps; ESCC, ESFM, IL, RSHES, RSHIL, RSV, ST or VT pumps sold with single-phase induction motors; and pumps sold with drivers other than electric motors), section IV (for pumps sold with motors and rated using the testing-based approach), or section V (for pumps sold with motors and rated using the calculation-based approach) of this appendix, and PER STD = the PER CL for a pump that is minimally compliant with DOE's energy conservation standards with the same flow and specific speed characteristics as the tested pump (hp), as determined in accordance with section II.B of this appendix.

A.2 For pumps rated as pumps sold with motors and continuous controls or non-continuous controls (including pumps sold with inverter-only synchronous electric motors with or without controls), determine the PEI VL using the following equation:

PEI VL = the pump energy index for a variable load (hp), PER VL = the pump energy rating for a variable load (hp), determined in accordance with section VI (for pumps sold with motors and continuous or non-continuous controls rated using the testing-based approach) or section VII of this appendix (for pumps sold with motors and continuous controls rated using the calculation-based approach), and PER STD = the PER CL for a pump that is minimally compliant with DOE's energy conservation standards with the same flow and specific speed characteristics as the tested pump (hp), as determined in accordance with section II.B of this appendix.

B. Determine the pump energy rating for the minimally compliant reference pump (PERSTD), according to the following equation:

Where: PERSTD = the PERCL for a pump that is minimally compliant with DOE's energy conservation standards with the same flow and specific speed characteristics as the tested pump (hp), ωi = 0.3333, Piin,m = calculated driver power input to the motor at load point i for the minimally compliant pump (hp), calculated in accordance with section II.B.1of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

B.1. Determine the driver power input at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: Piin,m = driver power input to the motor at load point i (hp), Pi = pump power input to the bare pump at load point i (hp), calculated in accordance with section II.B.1.1 of this appendix, Li = the part load motor losses at load point i (hp), calculated in accordance with section II.B.1.2 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

B.1.1. Determine the pump power input to the minimally compliant pump at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: Pi = pump power input to the bare pump at load point i (hp), αi = 0.947 for 75 percent of the BEP flow rate, 1.000 for 100 percent of the BEP flow rate, and 0.985 for 110 percent of the BEP flow rate; Pu,i = the pump power output at load point i of the tested pump (hp), as determined in accordance with section II.B.1.1.2 of this appendix; ηpump,STD = the minimally compliant pump efficiency (%), calculated in accordance with section II.B.1.1.1 of this appendix; and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

B.1.1.1 Calculate the minimally compliant pump efficiency based on the following equation:

ηpump,STD = −0.8500 × ln(Q100%) 2 −0.3800 × ln(Ns) × ln(Q100%) − 11.480 × ln(Ns) 2 + 17.800 × ln(Q100%) + 179.80 × ln(Ns) − (C + 555.60 Where: ηpump,STD = minimally compliant pump efficiency (%), Q100% = the BEP flow rate of the tested pump at full impeller and nominal speed of rotation (gpm), Ns = specific speed of the tested pump determined in accordance with section II.B.1.1.1.1 of this appendix, and C = the appropriate C-value for the category and nominal speed of rotation of the tested pump, as listed at § 431.466.

B.1.1.1.1 Determine the specific speed of the rated pump using the following equation:

Where: Ns = specific speed, nsp = the nominal speed of rotation (rpm), Q'100% = the measured BEP flow rate of the tested pump at full impeller and nominal speed of rotation (gpm), H100% = pump total head at 100 percent of the BEP flow rate of the tested pump at full impeller and nominal speed of rotation (ft), and S = the number of stages with which the pump is being rated

B.1.1.2 Determine the pump power output at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate using the following equation:

Where: Pu,i = the measured pump power output at load point i of the tested pump (hp), Qi = the measured flow rate at load point i of the tested pump (gpm), Hi = pump total head at load point i of the tested pump (ft), SG = the specific gravity of water at specified test conditions, which is equivalent to 1.00, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

B.1.2 Determine the motor part load losses at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Li = Lfull × yi Where: Li = part load motor losses at load point i (hp), Lfull = motor losses at full load (hp), as determined in accordance with section II.B.1.2.1 of this appendix, yi = part load loss factor at load point i determined in accordance with section II.B.1.2.2 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

B.1.2.1 Determine the full load motor losses using the appropriate motor efficiency value and horsepower as shown in the following equation:

Where: Lfull = motor losses at full load (hp), MotorHP = the motor horsepower as determined in accordance with section II.B.1.2.1.1 of this appendix (hp), and ηmotor,full = the default nominal full load motor efficiency as determined in accordance with section II.B.1.2.1.2 of this appendix (%).

B.1.2.1.1 Determine the motor horsepower as follows:

• For bare pumps other than ST pumps, the motor horsepower is determined as the horsepower rating listed in Table 2 of this appendix that is either equivalent to, or the next highest horsepower greater than, the pump power input to the bare pump at 120 percent of the BEP flow rate of the tested pump.

• For ST bare pumps, the motor horsepower is determined as the horsepower rating listed in Table 2 of this appendix that, is either equivalent to, or the next highest horsepower greater than, the pump power input to the bare pump at 120 percent of the BEP flow rate of the tested pump divided by a service factor of 1.15.

• For pumps sold with motors, pumps sold with motors and continuous controls, or pumps sold with motors and non-continuous controls, the motor horsepower is the rated horsepower of the motor with which the pump is being tested.

B.1.2.1.2 Determine the default nominal full load motor efficiency as described in section II.B.1.2.1.2.1 of this appendix for ESCC, ESFM, IL, RSHES, RSHIL, RSV, and VT pumps; section II.B.1.2.1.2.2 of this appendix for ST pumps; and section II.B.1.2.1.2.3 for SVIL pumps.

B.1.2.1.2.1. For ESCC, ESFM, IL, RSHES, RSHIL, RSV, and VT pumps, the default nominal full load motor efficiency is the minimum of the nominal full load motor efficiency standards (open or enclosed) from the table containing the current energy conservation standards for NEMA Design B motors at § 431.25, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section II.B.1.2.1.1 of this appendix.

B.1.2.1.2.2. For ST pumps, prior to the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load motor efficiency is the default nominal full load submersible motor efficiency listed in table 2 of this appendix, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section II.B.1.2.1.1 of this appendix. Starting on the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load motor efficiency shall be the minimum of any nominal full load motor efficiency standard from the table containing energy conservation standards for submersible motors in subpart B of this part, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section II.B.1.2.1.1 of this appendix.

B.1.2.1.2.3. For SVIL pumps, the default nominal full load motor efficiency is the minimum full load motor efficiency standard from the tables containing the current energy conservation standards for polyphase or CSCR/CSIR small electric motors at § 431.446, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section II.B.1.2.1.1 of this appendix, or for SVIL pumps sold with motors less than 0.25 hp, the default nominal full load motor efficiency is 58.3% for 6-pole, 64.6% for 4-pole, and 61.7% for 2-pole motors.

B.1.2.2 Determine the part load loss factor at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: yi = the part load loss factor at load point i, Pi = pump power input to the bare pump at load point i (hp), MotorHP = the motor horsepower (hp), as determined in accordance with section II.B.1.2.1.1 of this appendix, III. Test Procedure for Bare Pumps

A. Scope. This section III applies only to:

A.1 Bare pumps,

A.2 Pumps sold with drivers other than electric motors, and

A.3 ESCC, ESFM, IL, RSHES, RSHIL, RSV, ST, and VT pumps sold with single-phase induction motors.

B. Measurement Equipment. The requirements regarding measurement equipment presented in section I.B of this appendix apply to this section III. In addition, when testing pumps using a calibrated motor, electrical measurement equipment shall meet the requirements of section C.4.3 of HI 40.6-2021 (including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3 of HI 40.6), and motor power input shall be determined according to section 40.6.3.2.3 of HI 40.6-2021 and meet the requirements in Table 40.6.3.2.3 of HI 40.6-2021.

C. Test Conditions. The requirements regarding test conditions presented in section I.C of this appendix apply to this section III. In addition, when testing pumps using a calibrated motor, the conditions in section C.4.3.1 of HI 40.6-2021 shall be met, including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3.1 of HI 40.6-2021.

D. Testing BEP for the Pump. Determine the best efficiency point (BEP) of the pump as follows:

D.1. Adjust the flow by throttling the pump without changing the speed of rotation of the pump and conduct the test at a minimum of the following seven flow points: 40, 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate of the pump at the nominal speed of rotation, as specified in section 40.6.5.5.1 of HI 40.6-2021, including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6-2021.

D.2. Determine the BEP flow rate as the flow rate at the operating point of maximum pump efficiency on the pump efficiency curve, as determined in accordance with section 40.6.6.3 of HI 40.6-2021, where the pump efficiency is the ratio of the pump power output divided by the pump power input, as specified in Table 40.6.2 of HI 40.6-2021, disregarding the calculations provided in section 40.6.6.2 of HI 40.6-2021.

E. Calculating the Constant Load Pump Energy Rating. Determine the PERCL of each tested pump using the following equation:

Where: PERCL = the pump energy rating for a constant load (hp), ωi = 0.3333, Piin,m = calculated driver power input to the motor at load point i (hp), as determined in accordance with section III.E.1 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1 Determine the driver power input at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: Piin,m = driver power input to the motor at load point i (hp), Pi = pump power input to the bare pump at load point i (hp), as determined in section III.E.1.1 of this appendix, Li = the part load motor losses at load point i (hp), as determined in accordance with section III.E.1.2 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1.1 Determine the pump power input at 75, 100, 110, and 120 percent of the BEP flow rate by employing a least squares regression to determine a linear relationship between the pump power input at the nominal speed of rotation of the pump and the measured flow rate at the following load points: 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate. Use the linear relationship to determine the pump power input at the nominal speed of rotation for the load points of 75, 100, 110, and 120 percent of the BEP flow rate.

E.1.2 Determine the motor part load losses at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Li = Lfull × yi Where: Li = motor losses at load point i (hp), Lfull = motor losses at full load (hp), as determined in accordance with section III.E.1.2.1 of this appendix, yi = loss factor at load point i as determined in accordance with section III.E.1.2.2 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1.2.1 Determine the full load motor losses using the appropriate motor efficiency value and horsepower as shown in the following equation:

Where: Lfull = motor losses at full load (hp); MotorHP = the motor horsepower (hp), as determined in accordance with section II.E.1.2.1.1 of this appendix, and ηmotor,full = the default nominal full load motor efficiency (%), as determined in accordance with section III.E.1.2.1.2 of this appendix.

E.1.2.1.1 Determine the motor horsepower as follows:

• For bare pumps other than ST pumps, determine the motor horsepower by selecting the horsepower rating listed in Table 2 of this appendix that is either equivalent to, or the next highest horsepower greater than, the pump power input to the bare pump at 120 percent of the BEP flow rate of the tested pump.

• For ST bare pumps, determine the motor horsepower by selecting the horsepower rating listed in Table 2 of this appendix that, is either equivalent to, or the next highest horsepower greater than, the pump power input to the bare pump at 120 percent of the BEP flow rate of the tested pump divided by a service factor of 1.15.

• For pumps sold with motors, pumps sold with motors and continuous controls, or pumps sold with motors and non-continuous controls, the motor horsepower is the rated horsepower of the motor with which the pump is being tested.

E.1.2.1.2 Determine the default nominal full load motor efficiency as described in section III.E.1.2.1.2.1 of this appendix for ESCC, ESFM, IL, RSHES, RSHIL, RSV, and VT pumps; or section III.E.1.2.1.2.2. of this appendix for ST pumps; or section III.E.1.2.1.2.3 of this appendix for SVIL pumps.

E.1.2.1.2.1. For ESCC, ESFM, IL, RSHES, RSHIL, RSV, and VT pumps, the default nominal full load motor efficiency is the minimum of the nominal full load motor efficiency standards (open or enclosed) from the table containing the current energy conservation standards for NEMA Design B motors at § 431.25, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section III.E.1.2.1.1 of this appendix.

E.1.2.1.2.2. For ST pumps, prior to the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load motor efficiency is the default nominal full load submersible motor efficiency listed in table 2 of this appendix, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section III.E.1.2.1.1 of this appendix. Starting on the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load motor efficiency is the minimum of any nominal full load motor efficiency standard from the table containing energy conservation standards for submersible motors in subpart B of this part, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in accordance with section III.E.1.2.1.1 of this appendix.

E.1.2.1.2.3. For SVIL pumps, the default nominal full load motor efficiency is the minimum full load motor efficiency standard from the tables containing the current energy conservation standards for polyphase or CSCR/CSIR small electric motors at § 431.446, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower determined in section III.E.1.2.1.1 of this appendix, or for SVIL pumps sold with motors less than 0.25 hp, the default nominal full load motor efficiency is 58.3% for 6-pole, 64.6% for 4-pole, and 61.7% for 2-pole motors.

E.1.2.2 Determine the loss factor at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: yi = the part load loss factor at load point i, Pi = pump power input to the bare pump at load point i (hp), as determined in accordance with section III.E.1.1 of this appendix, MotorHP = as determined in accordance with section III.E.1.2.1 of this appendix (hp), IV. Testing-Based Approach for Pumps Sold With Motors

A. Scope. This section IV applies only to pumps sold with electric motors (excluding pumps sold with inverter-only synchronous electric motors regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part), including single-phase induction motors.

B. Measurement Equipment. The requirements regarding measurement equipment presented in section I.B of this appendix apply to this section IV. In addition, when testing pumps using a calibrated motor, electrical measurement equipment shall meet the requirements of section C.4.3 of HI 40.6-2021 (including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3 of HI 40.6), and motor power input shall be determined according to section 40.6.3.2.3 of HI 40.6-2021 and meet the requirements in Table 40.6.3.2.3 of HI 40.6-2021.

C. Test Conditions. The requirements regarding test conditions presented in section I.C of this appendix apply to this section IV. In addition, when testing pumps using a calibrated motor, the conditions in section C.4.3.1 of HI 40.6-2021, including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in Section C.4.3.1 of HI 40.6, shall be met.

D. Testing BEP for the Pump. Determine the best efficiency point (BEP) of the pump as follows:

D.1. Adjust the flow by throttling the pump without changing the speed of rotation of the pump and conduct the test at a minimum of the following seven flow points: 40, 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate of the pump at the nominal speed of rotation, as specified in section 40.6.5.5.1 of HI 40.6-2021, including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6-2021.

D.2. Determine the BEP flow rate as the flow rate at the operating point of maximum pump efficiency on the pump efficiency curve, as determined in accordance with Section 40.6.6.3 of HI 40.6-2021, where the pump efficiency is the ratio of the pump power output divided by the pump power input, as specified in Table 40.6.2 of HI 40.6-2021, disregarding the calculations provided in section 40.6.6.2 of HI 40.6-2021.

E. Calculating the Constant Load Pump Energy Rating. Determine the PERCL of each tested pump using the following equation:

Where: PERCL = the pump energy rating for a constant load (hp), ωi = 0.3333, Piin = measured driver power input to the motor at load point i (hp) for the tested pump as determined in accordance with section IV.E.1 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1 Determine the driver power input at 75, 100, and 110 percent of the BEP flow rate by employing a least squares regression to determine a linear relationship between the driver power input at the nominal speed of rotation of the pump and the measured flow rate at the following load points: 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate. Use the linear relationship to determine the driver power input at the nominal speed of rotation for the load points of 75, 100, and 110 percent of the BEP flow rate.

V. Calculation-Based Approach for Pumps Sold With Motors

A. Scope. This section V can only be used in lieu of the test method in section IV of this appendix to calculate the index for pumps sold with motors listed in section V.A.1, V.A.2, or V.A.3 of this appendix.

A.1 Pumps sold with motors subject to DOE's energy conservation standards for polyphase electric motors at § 431.25(g),

A.2 SVIL pumps sold with small electric motors regulated by DOE's energy conservation standards at § 431.446 or with SNEMs regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part but including motors of such varieties that are less than 0.25 hp, and

A.3. Pumps sold with submersible motors.

A.4. Pumps sold with motors not listed in sections V.A.1, V.A.2, or V.A.3 of this appendix cannot use this section V and must apply the test method in section IV of this appendix.

B. Measurement Equipment. The requirements regarding measurement equipment presented in section I.B of this appendix apply to this section V. In addition, when testing pumps using a calibrated motor, electrical measurement equipment shall meet the requirements of section C.4.3 of HI 40.6-2021 (including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3 of HI 40.6), and motor power input shall be determined according to section 40.6.3.2.3 of HI 40.6-2021 and meet the requirements in Table 40.6.3.2.3 of HI 40.6-2021.

C. Test Conditions. The requirements regarding test conditions presented in section I.C of this appendix apply to this section V. In addition, when testing pumps using a calibrated motor, the conditions in section C.4.3.1 of HI 40.6-2021, including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3.1 of HI 40.6-2021 shall be met.

D. Testing BEP for the Pump. Determine the best efficiency point (BEP) of the pump as follows:

D.1. Adjust the flow by throttling the pump without changing the speed of rotation of the pump and conduct the test at a minimum of the following seven flow points: 40, 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate of the pump at the nominal speed of rotation, as specified in section 40.6.5.5.1 of HI 40.6-2021, including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6-2021.

D.2. Determine the BEP flow rate as the flow rate at the operating point of maximum pump efficiency on the pump efficiency curve, as determined in accordance with section 40.6.6.3 of HI 40.6-2021, where the pump efficiency is the ratio of the pump power output divided by the pump power input, as specified in Table 40.6.2 of HI 40.6-2021, disregarding the calculations provided in section 40.6.6.2.

E. Calculating the Constant Load Pump Energy Rating. Determine the PERCL of each tested pump using the following equation:

Where: PERCL = the pump energy rating for a constant load (hp), ωi = 0.3333, Piin,m = calculated driver power input to the motor at load point i for the tested pump as determined in accordance with section V.E.1 of this appendix (hp), and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1 Determine the driver power input at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: Piin,m = driver power input to the motor at load point i (hp), Pi = pump power input to the bare pump at load point i, as determined in section V.E.1.1 of this appendix (hp), Li = the part load motor losses at load point i as determined in accordance with section V.E.1.2 of this appendix (hp), and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1.1 Determine the pump power input at 75, 100, and 110 percent of the BEP flow rate by employing a least squares regression to determine a linear relationship between the pump power input at the nominal speed of rotation of the pump and the measured flow rate at the following load points: 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate. Use the linear relationship to determine the pump power input at the nominal speed of rotation for the load points of 75, 100, and 110 percent of the BEP flow rate.

E.1.2 Determine the motor part load losses at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Li = Lfull × Yi Where: Li = motor losses at load point i (hp), Lfull = motor losses at full load as determined in accordance with section V.E.1.2.1 of this appendix (hp), yi = part load loss factor at load point i as determined in accordance with section V.E.1.2.2 of this appendix, and i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate.

E.1.2.1 Determine the full load motor losses using the appropriate motor efficiency value and horsepower as shown in the following equation:

Where: Lfull = motor losses at full load (hp), MotorHP = the horsepower of the motor with which the pump model is being tested (hp), and ηmotor,full = the represented nominal full load motor efficiency (i.e., nameplate/DOE-certified value) or default nominal full load submersible motor efficiency as determined in accordance with section V.E.1.2.1.1 of this appendix (%).

E.1.2.1.1 For pumps sold with motors other than submersible motors, determine the represented nominal full load motor efficiency as described in section V.E.1.2.1.1.1 of this appendix. For pumps sold with submersible motors, determine the default nominal full load submersible motor efficiency as described in section V.E.1.2.1.1.2 of this appendix.

E.1.2.1.1.1 For pumps sold with motors other than submersible motors, the represented nominal full load motor efficiency is that of the motor with which the given pump model is being tested, as determined in accordance with the DOE test procedure for electric motors at § 431.16 or, for SVIL, the DOE test procedure for small electric motors at § 431.444, or the DOE test procedure for SNEMs in subpart B to this part, as applicable (including for motors less than 0.25 hp), and if available, applicable representation procedures in 10 CFR part 429 and this part.

E.1.2.1.1.2 For pumps sold with submersible motors, prior to the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load submersible motor efficiency is that listed in table 2 of this appendix, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower of the pump being tested, or if a test procedure for submersible motors is provided in subpart B to this part, the represented nominal full load motor efficiency of the motor with which the given pump model is being tested, as determined in accordance with the applicable test procedure in subpart B to this part and applicable representation procedures in 10 CFR part 429 and this part, may be used instead. Starting on the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load submersible motor efficiency may no longer be used. Instead, the represented nominal full load motor efficiency of the motor with which the given pump model is being tested, as determined in accordance with the applicable test procedure in subpart B of this part and applicable representation procedures in 10 CFR part 429 and this part, must be used.

E.1.2.2 Determine the loss factor at each load point corresponding to 75, 100, or 110 percent of the BEP flow rate as follows:

Where: yi = the part load loss factor at load point i, Pi = the pump power input to the bare pump at load point i as determined in accordance with section V.E.1.1 of this appendix (hp), MotorHP = the horsepower of the motor with which the pump model is being tested (hp), i = load point corresponding to 75, 100, or 110 percent of the BEP flow rate, and in the equation in this section V.E.1.2.2. of this appendix to calculate the part load loss factor at each load point VI. Testing-Based Approach for Pumps Sold with Motors and Controls

A. Scope. This section VI applies only to pumps sold with electric motors, including single-phase induction motors, and continuous or non-continuous controls, as well as to pumps sold with inverter-only synchronous electric motors that are regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part (with or without controls). For the purposes of this section VI, all references to “driver input power” in this section VI or HI 40.6-2021 refer to the input power to the continuous or non-continuous controls.

B. Measurement Equipment. The requirements regarding measurement equipment presented in section I.B of this appendix apply to this section VI. In addition, when testing pumps using a calibrated motor, electrical measurement equipment shall meet the requirements of section C.4.3 of HI 40.6-2021 (including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3 of HI 40.6), and motor power input shall be determined according to section 40.6.3.2.3 of HI 40.6-2021 and meet the requirements in Table 40.6.3.2.3 of HI 40.6-2021.

C. Test Conditions. The requirements regarding test conditions presented in section I.C of this appendix apply to this section VI. In addition, when testing pumps using a calibrated motor, the conditions in section C.4.3.1 of HI 40.6-2021, including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3.1 of HI 40.6, shall be met.

D. Testing BEP for the Pump. Determine the best efficiency point (BEP) of the pump as follows:

D.1. Adjust the flow by throttling the pump without changing the speed of rotation of the pump and conduct the test at a minimum of the following seven flow points: 40, 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate of the pump at the nominal speed of rotation, as specified in section 40.6.5.5.1 of HI 40.6-2021, including the applicable provisions of HI 9.6.1-2017 as referenced in section 40.6.5.5.1 of HI 40.6-2021.

D.2. Determine the BEP flow rate as the flow rate at the operating point of maximum pump efficiency on the pump efficiency curve, as determined in accordance with section 40.6.6.3 of HI 40.6-2021, where the pump efficiency is the ratio of the pump power output divided by the pump power input, as specified in Table 40.6.2 of HI 40.6-2021, disregarding the calculations provided in section 40.6.6.2.

E. Calculating the Variable Load Pump Energy Rating. Determine the PERVL of each tested pump using the following equation:

Where: PERVL = the pump energy rating for a variable load (hp); ωi = 0.25; Piin,c = the normalized driver power input to continuous or non-continuous controls at load point i for the tested pump as determined in accordance with section VI.E.1 of this appendix; and i = load point corresponding 25, 50, 75, or 100 percent of the BEP flow rate.

E.1. Determine the driver power input at 100 percent of the measured BEP flow rate of the tested pump by employing a least squares regression to determine a linear relationship between the measured driver power input at the nominal speed of rotation of the pump and the measured flow rate, using the following load points: 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate. Use the linear relationship to determine the driver power input at the nominal speed of rotation for the load point of 100 percent of the measured BEP flow rate of the tested pump.

E.2 Determine the driver power input at 25, 50, and 75 percent of the BEP flow rate by measuring the driver power input at the load points defined by:

(1) Those flow rates, and

(2) The associated head points calculated according to the following reference system curve equation:

Where: Hi = pump total head at load point i (ft), H100% = pump total head at 100 percent of the BEP flow rate and nominal speed of rotation (ft), Qi = flow rate at load point i (gpm), Q100% = flow rate at 100 percent of the BEP flow rate and nominal speed of rotation (gpm), and i = load point corresponding to 25, 50, or 75 percent of the measured BEP flow rate of the tested pump.

E.2.1. For pumps sold with motors and continuous controls, the specific head and flow points must be achieved within 10 percent of the calculated values and the measured driver power input must be corrected to the exact intended head and flow conditions using the following equation:

Where: Piin,c = the corrected driver power input to the continuous or non-continuous controls at load point i (hp), Hsp,i = the specified total system head at load point i based on the reference system curve (ft), HM,j = the measured total system head at load point j (ft), Qsp,i = the specified total system flow rate at load point i based on the reference system curve (gpm), QM,j = the measured total system flow rate at load point j (gpm), PM,jin,c = the measured normalized driver power input to the continuous or non-continuous controls at load point j (hp), i = specified load point at 25, 50, 75, or 100 percent of BEP flow, and j = measured load point corresponding to specified load point i.

E.2.2. For pumps sold with motors and non-continuous controls, the head associated with each of the specified flow points shall be no lower than 10 percent below that defined by the reference system curve equation in section VI.E.2 of this appendix. Only the measured flow points must be achieved within 10 percent of the calculated values. Correct for flow and head as described in section VI.E.2.1, except do not correct measured head values that are higher than the reference system curve at the same flow rate; only correct flow rate and head values lower than the reference system curve at the same flow rate. For head values higher than the system curve, use the measured head points directly to calculate PEIVL.

VII. Calculation-Based Approach for Pumps Sold With Motors and Controls

A. Scope. This section VII can only be used in lieu of the test method in section VI of this appendix to calculate the index for pumps listed in sections VII.A.1, VII.A.2, VII.A.3, and VII.A.4 of this appendix.

A.1. Pumps sold with motors regulated by DOE's energy conservation standards for polyphase NEMA Design B electric motors at § 431.25(g) and continuous controls,

A.2. Pumps sold with inverter-only synchronous electric motors regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part,

A.3. SVIL pumps sold with small electric motors regulated by DOE's energy conservation standards at § 431.446 or with SNEMs regulated by DOE's test procedure and/or energy conservation standards in subpart B of this part (but including motors of such varieties that are less than 0.25 hp) and continuous controls,

A.4. Pumps sold with submersible motors and continuous controls, and

A.5. Pumps sold with motors not listed in sections VII.A.1, VII.A.2, VII.A.3, and VII.A.4 of this appendix and pumps sold without continuous controls, including pumps sold with non-continuous controls, cannot use this section and must apply the test method in section VI of this appendix.

B. Measurement Equipment. The requirements regarding measurement equipment presented in section I.B of this appendix apply to this section VII. In addition, when testing pumps using a calibrated motor, electrical measurement equipment shall meet the requirements of section C.4.3 of HI 40.6-2021 (including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3 of HI 40.6), and motor power input shall be determined according to section 40.6.3.2.3 of HI 40.6-2021 and meet the requirements in Table 40.6.3.2.3 of HI 40.6-2021.

C. Test Conditions. The requirements regarding test conditions presented in section I.C of this appendix apply to this section VII. In addition, when testing pumps using a calibrated motor, the conditions in section C.4.3.1 of HI 40.6-2021, including the applicable provisions of CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, as referenced in section C.4.3.1 of HI 40.6-2021 shall be met.

D. Testing BEP for the Pump. Determine the best efficiency point (BEP) of the pump as follows:

D.1. Adjust the flow by throttling the pump without changing the speed of rotation of the pump and conduct the test at a minimum of the following seven flow points: 40, 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate of the pump at the nominal speed of rotation, as specified in HI 40.6-2021, except section 40.6.5.3, and appendix B, including the applicable provisions of HI 9.6.1-2017, HI 9.6.6-2016, HI 9.8-2018, HI 14.1-14.2-2019, the HI Engineering Data Book, ASME MFC-3M-2004, ASME MFC-5M-1985, ASME MFC-8M-2001, ASME MFC-12M-2006, ASME MFC-16-2014, ASME MFC-22-2007, AWWA E103-2015, CSA C390-10, IEEE 112-2017, IEEE 114-2010-A, ISO 1438:2017, ISO 2186:2007, ISO 2715:2017, ISO 3354:2008, ISO 3966:2020, ISO 5167-1:2003, ISO 5198:1987, ISO 6416:2017, and ISO 20456:2017, as referenced in HI 40.6-2021.

D.2. Determine the BEP flow rate as the flow rate at the operating point of maximum pump efficiency on the pump efficiency curve, as determined in accordance with section 40.6.6.3 of HI 40.6-2021, where the pump efficiency is the ratio of the pump power output divided by the pump power input, as specified in Table 40.6.2 of HI 40.6-2021, disregarding the calculations provided in section 40.6.6.2.

E. Calculating the Variable Load Pump Energy Rating. Determine the PERVL of each tested pump using the following equation:

Where: PERVL = the pump energy rating for a variable load (hp); ωi = 0.25; Piin,c = the calculated driver power input to the continuous or non-continuous controls at load point i for the tested pump as determined in accordance with section VII.E.1 of this appendix; and i = load point corresponding to 25, 50, 75, or 100 percent of the BEP flow rate.

E.1 Determine the driver power input at each load point corresponding to 25, 50, 75, or 100 percent of the BEP flow rate as follows:

Where: Piin,c = driver power input at to the continuous or non-continuous controls at load point i (hp), Pi = pump power input to the bare pump at load point i as determined in accordance with section VII.E.1.1 of this appendix (hp), Li = the part load motor and control losses at load point i as determined in accordance with section VII.E.1.2 of this appendix (hp), and i = load point corresponding to 25, 50, 75, or 100 percent of the BEP flow rate.

E.1.1 Determine the pump power input at 100 percent of the measured BEP flow rate of the tested pump by employing a least squares regression to determine a linear relationship between the measured pump power input at the nominal speed of rotation and the measured flow rate at the following load points: 60, 75, 90, 100, 110, and 120 percent of the expected BEP flow rate. Use the linear relationship to determine the pump power input at the nominal speed of rotation for the load point of 100 percent of the BEP flow rate.

E.1.1.1 Determine the pump power input at 25, 50, and 75 percent of the BEP flow rate based on the measured pump power input at 100 percent of the BEP flow rate and using with the following equation:

Where: Pi = pump power input at load point i (hp); P100% = pump power input at 100 percent of the BEP flow rate and nominal speed of rotation (hp); Qi = flow rate at load point i (gpm); Q100% = flow rate at 100 percent of the BEP flow rate and nominal speed of rotation (gpm); and i = load point corresponding to 25, 50, or 75 percent of the measured BEP flow rate of the tested pump.

E.1.2 Calculate the motor and control part load losses at each load point corresponding to 25, 50, 75, and 100 percent of the BEP flow rate as follows:

Li = Lfull × zi Where: Li = motor and control losses at load point i (hp), Lfull = motor losses at full load or, for inverter-only synchronous electric motors, motor + inverter losses at full load, as determined in accordance with section VII.E.1.2.1 of this appendix (hp), zi = part load loss factor at load point i as determined in accordance with section VII.E.1.2.2 of this appendix, and i = load point corresponding to 25, 50, 75, or 100 percent of the BEP flow rate.

E.1.2.1 Determine the full load motor losses using the appropriate motor efficiency value and horsepower as shown in the following equation:

Where: Lfull = motor losses at full load (hp), or for inverter-only synchronous electric motors, motor + inverter losses at full load, MotorHP = the horsepower of the motor with which the pump model is being tested (hp), and η motor,full = the represented nominal full load motor efficiency (i.e., nameplate/DOE-certified value) or the represented nominal full load motor + inverter efficiency or the default nominal full load submersible motor efficiency as determined in accordance with section VII.E.1.2.1.1 of this appendix (%).

E.1.2.1.1 For pumps sold with motors other than inverter-only synchronous electric motors or submersible motors, determine the represented nominal full load motor efficiency as described in section VII.E.1.2.1.1.1 of this appendix. For pumps sold with inverter-only synchronous electric motors, determine the represented nominal full load motor + inverter efficiency as described in section VII.E.1.2.1.1.2 of this appendix. For pumps sold with submersible motors, determine the default nominal full load submersible motor efficiency as described in section VII.E.1.2.1.1.3 of this appendix.

E.1.2.1.1.1 For pumps sold with motors other than inverter-only synchronous electric motors or submersible motors, the represented nominal full load motor efficiency is that of the motor with which the given pump model is being tested, as determined in accordance with the DOE test procedure for electric motors at § 431.16 or, for SVIL, the DOE test procedure for small electric motors at § 431.444 or the DOE test procedure for SNEMs in subpart B of this part, as applicable (including for motors less than 0.25 hp), and, if available, applicable representation procedures in 10 CFR part 429 and this part.

E.1.2.1.1.2 For pumps sold with inverter-only synchronous electric motors, the represented nominal full load motor + inverter efficiency is that of the motor with which the given pump model is being tested, as determined in accordance with the DOE test procedure for inverter-only synchronous electric motors in subpart B of this part, and, if available, applicable representation procedures in 10 CFR part 429 and this part.

E.1.2.1.1.3 For pumps sold with submersible motors, prior to the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load submersible motor efficiency is that listed in table 2 of this appendix, with the number of poles relevant to the speed at which the pump is being tested (see section I.C.1 of this appendix) and the motor horsepower of the pump being tested, or if a test procedure for submersible motors is provided in subpart B of this part, the represented nominal full load motor efficiency of the motor with which the given pump model is being tested, as determined in accordance with the applicable test procedure in subpart B of this part and applicable representation procedures in 10 CFR part 429 and this part, may be used instead. Starting on the compliance date of any energy conservation standards for submersible motors in subpart B of this part, the default nominal full load submersible motor efficiency may no longer be used and instead the represented nominal full load motor efficiency of the motor with which the given pump model is being tested, as determined in accordance with the applicable test procedure in subpart B of this part and applicable representation procedures in 10 CFR part 429 and this part, must be used instead.

E.1.2.2 For load points corresponding to 25, 50, 75, and 100 percent of the BEP flow rate, determine the part load loss factor at each load point as follows:

Where: z i = the motor and control part load loss factor at load point i, a,b,c = coefficients listed in either Table 4 of this appendix for induction motors or Table 5 of this appendix for inverter-only synchronous electric motors, based on the horsepower of the motor with which the pump is being tested, P i = the pump power input to the bare pump at load point i, as determined in accordance with section VII.E.1.1 of this appendix (hp), MotorHP = the horsepower of the motor with which the pump is being tested (hp), [81 FR 4145, Jan. 25, 2016, as amended at 82 FR 36924, Aug. 7, 2017; 88 FR 17978, Mar. 24, 2023; 88 FR 24471, Apr. 21, 2023]

Note:

On February 5, 2018 but before July 19, 2021, any representations made with respect to the energy use or efficiency of dedicated-purpose pool pumps subject to testing pursuant to 10 CFR 431.464(b) must be made in accordance with the results of testing pursuant to this appendix. Any optional representations of energy factor (EF) must be accompanied by a representation of weighted energy factor (WEF).

I. Test Procedure for Dedicated-Purpose Pool Pumps A. General

A.1 Test Method. To determine the weighted energy factor (WEF) for dedicated-purpose pool pumps, perform “wire-to-water” testing in accordance with HI 40.6-2014-B, except section 40.6.4.1, “Vertically suspended pumps”; section 40.6.4.2, “Submersible pumps”; section 40.6.5.3, “Test report”; section 40.6.5.5, “Test conditions”; section 40.6.5.5.2, “Speed of rotation during testing”; section 40.6.6.1, “Translation of test results to rated speed of rotation”; section 40.6.6.2, “Pump efficiency”; section 40.6.6.3, “Performance curve”; section A.7, “Testing at temperatures exceeding 30 °C (86 °F)”; and appendix B, “Reporting of test results”; (incorporated by reference, see § 431.463) with the modifications and additions as noted throughout the provisions below. Do not use the test points specified in section 40.6.5.5.1, “Test procedure” of HI 40.6-2014-B and instead use those test points specified in section D.3 of this appendix for the applicable dedicated-purpose pool pump variety and speed configuration. When determining overall efficiency, best efficiency point, or other applicable pump energy performance information, section 40.6.5.5.1, “Test procedure”; section 40.6.6.2, “Pump efficiency”; and section 40.6.6.3, “Performance curve” must be used, as applicable. For the purposes of applying this appendix, the term “volume per unit time,” as defined in section 40.6.2, “Terms and definitions,” of HI 40.6-2014-B shall be deemed to be synonymous with the term “flow rate” used throughout that standard and this appendix.

A.2. Calculations and Rounding. All terms and quantities refer to values determined in accordance with the procedures set forth in this appendix for the rated pump. Perform all calculations using raw measured values without rounding. Round WEF, EF, maximum head, vertical lift, and true priming time values to the tenths place (i.e., 0.1) and rated hydraulic horsepower to the thousandths place (i.e., 0.001). Round all other reported values to the hundredths place unless otherwise specified.

B. Measurement Equipment

B.1 For the purposes of measuring flow rate, speed of rotation, temperature, and pump power output, the equipment specified in HI 40.6-2014-B Appendix C (incorporated by reference, see § 431.463) necessary to measure head, speed of rotation, flow rate, and temperature must be used and must comply with the stated accuracy requirements in HI 40.6-2014-B Table 40.6.3.2.3, except as specified in section B.1.1 and B.1.2 of this appendix. When more than one instrument is used to measure a given parameter, the combined accuracy, calculated as the root sum of squares of individual instrument accuracies, must meet the specified accuracy requirements.

B.1.1 Electrical measurement equipment for determining the driver power input to the motor or controls must be capable of measuring true root mean squared (RMS) current, true RMS voltage, and real power up to the 40th harmonic of fundamental supply source frequency, and have a combined accuracy of ±2.0 percent of the measured value at the fundamental supply source frequency.

B.1.2 Instruments for measuring distance (e.g., height above the reference plane or water level) must be accurate to and have a resolution of at least ±0.1 inch.

B.2 Calibration. Calibration requirements for instrumentation are specified in appendix D of HI 40.6-2014-B (incorporated by reference, see § 431.463). Historical calibration data may be used to justify time periods up to three times longer than those specified in table D.1 of HI 40.6-2014-B provided the supporting historical data shows maintenance of calibration of the given instrument up to the selected extended calibration interval on at least two unique occasions, based on the interval specified in HI 40.6-2014-B.

C. Test Conditions and Tolerances

C.1 Pump Specifications. Conduct testing at full impeller diameter in accordance with the test conditions, stabilization requirements, and specifications of HI 40.6-2014-B section 40.6.3, “Pump efficiency testing”; section 40.6.4, “Considerations when determining the efficiency of a pump”; section 40.6.5.4 (including appendix A), “Test arrangements”; and section 40.6.5.5, “Test conditions” (incorporated by reference, see § 431.463).

C.2 Power Supply Requirements. The following conditions also apply to the mains power supplied to the DPPP motor or controls, if any:

(1) Maintain the voltage within ±5 percent of the rated value of the motor,

(2) Maintain the frequency within ±1 percent of the rated value of the motor,

(3) Maintain the voltage unbalance of the power supply within ±3 percent of the value with which the motor was rated, and

(4) Maintain total harmonic distortion below 12 percent throughout the test.

C.3 Test Conditions. Testing must be carried out with water that is between 50 and 107 °F with less than or equal to 15 nephelometric turbidity units (NTU).

C.4 Tolerances. For waterfall pumps, multi-speed self-priming and non-self-priming pool filter pumps, and variable-speed self-priming and non-self-priming pool filter pumps all measured load points must be within ±2.5 percent of the specified head value and comply with any specified flow values or thresholds. For all other dedicated-purpose pool pumps, all measured load points must be within the greater of ±2.5 percent of the specified flow rate values or ±0.5 gpm and comply with any specified head values or thresholds.

D. Data Collection and Stabilization

D.1 Damping Devices. Use of damping devices, as described in section 40.6.3.2.2 of HI 40.6-2014-B (incorporated by reference, see § 431.463), are only permitted to integrate up to the data collection interval used during testing.

D.2 Stabilization. Record data at any tested load point only under stabilized conditions, as defined in HI 40.6-2014-B section 40.6.5.5.1 (incorporated by reference, see § 431.463), where a minimum of two measurements are used to determine stabilization.

D.3 Test Points. Measure the flow rate in gpm, pump total head in ft, the driver power input in W, and the speed of rotation in rpm at each load point specified in Table 1 of this appendix for each DPPP variety and speed configuration:

E. Calculations

E.1 Determination of Weighted Energy Factor. Determine the WEF as a ratio of the measured flow and driver power input to the dedicated-purpose pool pump in accordance with the following equation:

Where: WEF = Weighted Energy Factor in kgal/kWh; wi = weighting factor at each load point i, as specified in section E.2 of this appendix; Qi = flow at each load point i, in gpm; Pi = driver power input to the motor (or controls, if present) at each load point i, in watts; i = load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix; and n = number of load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix.

E.2 Weights. When determining WEF, apply the weights specified in Table 2 of this appendix for the applicable load points, DPPP varieties, and speed configurations:

E.3 Determination of Horsepower and True Power Factor Metrics

E.3.1 Determine the pump power output at any load point i using the following equation:

Where: Pu,i = the measured pump power output at load point i of the tested pump, in hp; Qi = the measured flow rate at load point i of the tested pump, in gpm; Hi = pump total head at load point i of the tested pump, in ft; and SG = the specific gravity of water at specified test conditions, which is equivalent to 1.00.

E.3.1.1 Determine the rated hydraulic horsepower as the pump power output measured on the reference curve at maximum rotating speed and full impeller diameter for the rated pump.

E.3.2 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, determine the dedicated-purpose pool pump nominal motor horsepower as the product of the measured full load speed and torque, adjusted to the appropriate units, as shown in the following equation:

Where: Pnm = the dedicated-purpose pool pump nominal total horsepower at full load, in hp; T = output torque at full load, in lb-ft; and n = the motor speed at full load, in rpm.

Full-load speed and torque shall be determined based on the maximum continuous duty motor power output rating allowable for the motor's nameplate ambient rating and insulation class.

E.3.2.1 For single-phase AC motors, determine the measured speed and torque at full load according to either section E.3.2.1.1 or E.3.2.1.2 of this appendix.

E.3.2.1.1 Use the procedures in section 3.2, “Tests with load”; section 4 “Testing facilities”; section 5.2 “Mechanical measurements”; section 5.3 “Temperature measurements”; and section 6 “Tests” of IEEE 114-2010 (incorporated by reference, see § 431.463), or

E.3.2.1.2 Use the applicable procedures in section 5, “General test requirements” and section 6, “Tests” of CSA C747-2009 (RA 2014); except in section 6.4(b) the conversion factor shall be 5252, only measurements at full load are required in section 6.5, and section 6.6 shall be disregarded (incorporated by reference, see § 431.463).

E.3.2.2 For DC motors, determine the measured speed and torque at full load according to either section E.3.2.2.1 or E.3.2.2.2 of this appendix.

E.3.2.2.1 Use the procedures in section 3.1, “Instrument Selection Factors”; section 3.4 “Power Measurement”: Section 3.5 “Power Sources”; section 4.1.2 “Ambient Air”; section 4.1.4 “Direction of Rotation”; section 5.4.1 “Reference Conditions”; and section 5.4.3.2 “Dynomometer or Torquemeter Method” of IEEE 113-1985 (incorporated by reference, see § 431.463), or

E.3.2.2.2 Use the applicable procedures in section 5, “General test requirements” and section 6, “Tests” of CSA C747-2009 (RA 2014); except in section 6.4(b) the conversion factor shall be 5252, only measurements at full load are required in section 6.5, and section 6.6 shall be disregarded (incorporated by reference, see § 431.463).

E.3.3 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, the dedicated-purpose pool pump service factor is equal to 1.0.

E.3.4 Determine the dedicated-purpose pool pump motor total horsepower according to section E.3.4.1 of this appendix for dedicated-purpose pool pumps with single-phase AC motors or DC motors and section E.3.4.2 of this appendix for dedicated-purpose pool pumps with polyphase AC motors.

E.3.4.1 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, determine the dedicated-purpose pool pump motor total horsepower as the product of the dedicated-purpose pool pump nominal motor horsepower, determined in accordance with section E.3.2 of this appendix, and the dedicated-purpose pool pump service factor, determined in accordance with section E.3.3 of this appendix.

E.3.4.2 For dedicated-purpose pool pumps with polyphase AC induction motors, determine the dedicated-purpose pool pump motor total horsepower as the product of the rated nominal motor horsepower and the rated service factor of the motor.

E.3.5 Determine the true power factor at each applicable load point specified in Table 1 of this appendix for each DPPP variety and speed configuration as a ratio of driver power input to the motor (or controls, if present) (Pi), in watts, divided by the product of the voltage in volts and the current in amps at each load point i, as shown in the following equation:

Where: PFi = true power factor at each load point i, dimensionless; Pi = driver power input to the motor (or controls, if present) at each load point i, in watts; Vi = voltage at each load point i, in volts; Ii = current at each load point i, in amps; and i = load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix.

E.4 Determination of Maximum Head. Determine the maximum head for self-priming pool filter pumps, non-self-priming pool filter pumps, and waterfall pumps by measuring the head at maximum speed and the minimum flow rate at which the pump is designed to operate continuously or safely, where the minimum flow rate is assumed to be zero unless stated otherwise in the manufacturer literature.

F. Determination of Self-Priming Capability

F.1 Test Method. Determine the vertical lift and true priming time of non-self-priming pool filter pumps and self-priming pool filter pumps that are not already certified as self-priming under NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) by testing such pumps pursuant to section C.3 of appendix C of NSF/ANSI 50-2015, except for the modifications and exceptions listed in the following sections F.1.1 through F.1.5 of this appendix:

F.1.1 Where section C.3.2, “Apparatus,” and section C.3.4, “Self-priming capability test method,” of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) state that the “suction line must be essentially as shown in annex C, figure C.1;” the phrase “essentially as shown in Annex C, figure C.1” means:

• The centerline of the pump impeller shaft is situated a vertical distance equivalent to the specified vertical lift (VL), calculated in accordance with section F.1.1.1. of this appendix, above the water level of a water tank of sufficient volume as to maintain a constant water surface level for the duration of the test;

• The pump draws water from the water tank with a riser pipe that extends below the water level a distance of at least 3 times the riser pipe diameter (i.e., 3 pipe diameters);

• The suction inlet of the pump is at least 5 pipe diameters from any obstructions, 90° bends, valves, or fittings; and

• The riser pipe is of the same pipe diameter as the pump suction inlet.

F.1.1.1 The vertical lift (VL) must be normalized to 5.0 feet at an atmospheric pressure of 14.7 psia and a water density of 62.4 lb/ft 3 in accordance with the following equation:

Where: VL = vertical lift of the test apparatus from the waterline to the centerline of the pump impeller shaft, in ft; ρtest = density of test fluid, in lb/ft 3; and Pabs,test = absolute barometric pressure of test apparatus location at centerline of pump impeller shaft, in psia.

F.1.2 The equipment accuracy requirements specified in section B, “Measurement Equipment,” of this appendix also apply to this section F, as applicable.

F.1.2.1 All measurements of head (gauge pressure), flow, and water temperature must be taken at the pump suction inlet and all head measurements must be normalized back to the centerline of the pump impeller shaft in accordance with section A.3.1.3.1 of HI 40.6-2014-B (incorporated by reference, see § 431.463).

F.1.3 All tests must be conducted with clear water that meets the requirements adopted in section C.3 of this appendix.

F.1.4 In section C.3.4, “Self-priming capability test method,” of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463), “the elapsed time to steady discharge gauge reading or full discharge flow” is determined when the changes in head and flow, respectively, are within the tolerance values specified in table 40.6.3.2.2, “Permissible amplitude of fluctuation as a percentage of mean value of quantity being measured at any test point,” of HI 40.6-2014-B (incorporated by reference, see § 431.463). The measured priming time (MPT) is determined as the point in time when the stabilized load point is first achieved, not when stabilization is determined. In addition, the true priming time (TPT) is equivalent to the MPT.

F.1.5 The maximum true priming time for each test run must not exceed 10.0 minutes. Disregard section C.3.5 of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463).

G. Optional Testing and Calculations

G.1 Energy Factor. When making representations regarding the EF of dedicated-purpose pool pumps, determine EF on one of four system curves (A, B, C, or D) and at any given speed (s) according to the following equation:

Where: EFX,s = the energy factor on system curve X at speed s in gal/Wh; X = one of four possible system curves (A, B, C, or D), as defined in section G.1.1 of this appendix; s = the tested speed, in rpm; QX,s = flow rate measured on system curve X at speed s in gpm; and PX,s = driver power input to the motor (or controls, if present) on system curve X at speed s in watts.

G.1.1 System Curves. The energy factor may be determined at any speed (s) and on any of the four system curves A, B, C, and/or D specified in the Table 3:

G.2 Replacement Dedicated-Purpose Pool Pump Motors. To determine the WEF for replacement DPPP motors, test each replacement DPPP motor paired with each dedicated-purpose pool pump bare pump for which the replacement DPPP motor is advertised to be paired, as stated in the manufacturer's literature for that replacement DPPP motor model, according to the testing and calculations described in sections A, B, C, D, and E of this appendix. Alternatively, each replacement DPPP motor may be tested with the most consumptive dedicated-purpose pool pump bare pump for which it is advertised to be paired, as stated in the manufacturer's literature for that replacement DPPP motor model. If a replacement DPPP motor is not advertised to be paired with any specific dedicated-purpose pool pump bare pumps, test with the most consumptive dedicated-purpose pool pump bare pump available.

[82 FR 36924, Aug. 7, 2017]

Note:

Any representations made on or after July 19, 2021, with respect to the energy use or efficiency of dedicated-purpose pool pumps subject to testing pursuant to 10 CFR 431.464(b) must be made in accordance with the results of testing pursuant to this appendix.

I. Test Procedure for Dedicated-Purpose Pool Pumps A. General

A.1 Test Method. To determine the weighted energy factor (WEF) for dedicated-purpose pool pumps, perform “wire-to-water” testing in accordance with HI 40.6-2014-B, except section 40.6.4.1, “Vertically suspended pumps”; section 40.6.4.2, “Submersible pumps”; section 40.6.5.3, “Test report”; section 40.6.5.5, “Test conditions”; section 40.6.5.5.2, “Speed of rotation during testing”; section 40.6.6.1, “Translation of test results to rated speed of rotation”; section 40.6.6.2, “Pump efficiency”; section 40.6.6.3, “Performance curve”; section A.7, “Testing at temperatures exceeding 30 °C (86 °F)”; and appendix B, “Reporting of test results”; (incorporated by reference, see § 431.463) with the modifications and additions as noted throughout the provisions below. Do not use the test points specified in section 40.6.5.5.1, “Test procedure” of HI 40.6-2014-B and instead use those test points specified in section D.3 of this appendix for the applicable dedicated-purpose pool pump variety and speed configuration. When determining overall efficiency, best efficiency point, or other applicable pump energy performance information, section 40.6.5.5.1, “Test procedure”; section 40.6.6.2, “Pump efficiency”; and section 40.6.6.3, “Performance curve” must be used, as applicable. For the purposes of applying this appendix, the term “volume per unit time,” as defined in section 40.6.2, “Terms and definitions,” of HI 40.6-2014-B shall be deemed to be synonymous with the term “flow rate” used throughout that standard and this appendix .

A.2 Calculations and Rounding. All terms and quantities refer to values determined in accordance with the procedures set forth in this appendix for the rated pump. Perform all calculations using raw measured values without rounding. Round WEF, maximum head, vertical lift, and true priming time values to the tenths place (i.e., 0.1) and rated hydraulic horsepower to the thousandths place (i.e., 0.001). Round all other reported values to the hundredths place unless otherwise specified.

B. Measurement Equipment

B.1 For the purposes of measuring flow rate, speed of rotation, temperature, and pump power output, the equipment specified in HI 40.6-2014-B Appendix C (incorporated by reference, see § 431.463) necessary to measure head, speed of rotation, flow rate, and temperature must be used and must comply with the stated accuracy requirements in HI 40.6-2014-B Table 40.6.3.2.3, except as specified in sections B.1.1 and B.1.2 of this appendix. When more than one instrument is used to measure a given parameter, the combined accuracy, calculated as the root sum of squares of individual instrument accuracies, must meet the specified accuracy requirements.

B.1.1 Electrical measurement equipment for determining the driver power input to the motor or controls must be capable of measuring true root mean squared (RMS) current, true RMS voltage, and real power up to the 40th harmonic of fundamental supply source frequency, and have a combined accuracy of ±2.0 percent of the measured value at the fundamental supply source frequency.

B.1.2 Instruments for measuring distance (e.g., height above the reference plane or water level) must be accurate to and have a resolution of at least ±0.1 inch.

B.2 Calibration. Calibration requirements for instrumentation are specified in appendix D of HI 40.6-2014-B (incorporated by reference, see § 431.463). Historical calibration data may be used to justify time periods up to three times longer than those specified in table D.1 of HI 40.6-2014-B provided the supporting historical data shows maintenance of calibration of the given instrument up to the selected extended calibration interval on at least two unique occasions, based on the interval specified in HI 40.6-2014-B.

C. Test Conditions and Tolerances

C.1 Pump Specifications. Conduct testing at full impeller diameter in accordance with the test conditions, stabilization requirements, and specifications of HI 40.6-2014-B section 40.6.3, “Pump efficiency testing”; section 40.6.4, “Considerations when determining the efficiency of a pump”; section 40.6.5.4 (including appendix A), “Test arrangements”; and section 40.6.5.5, “Test conditions” (incorporated by reference, see § 431.463).

C.2 Power Supply Requirements. The following conditions also apply to the mains power supplied to the DPPP motor or controls, if any:

(1) Maintain the voltage within ±5 percent of the rated value of the motor,

(2) Maintain the frequency within ±1 percent of the rated value of the motor,

(3) Maintain the voltage unbalance of the power supply within ±3 percent of the value with which the motor was rated, and

(4) Maintain total harmonic distortion below 12 percent throughout the test.

C.3 Test Conditions. Testing must be carried out with water that is between 50 and 107 °F with less than or equal to 15 nephelometric turbidity units (NTU).

C.4 Tolerances. For waterfall pumps, multi-speed self-priming and non-self-priming pool filter pumps, and variable-speed self-priming and non-self-priming pool filter pumps all measured load points must be within ±2.5 percent of the specified head value and comply with any specified flow values or thresholds. For all other dedicated-purpose pool pumps, all measured load points must be within the greater of ±2.5 percent of the specified flow rate values or ±0.5 gpm and comply with any specified head values or thresholds.

D. Data Collection and Stabilization

D.1 Damping Devices. Use of damping devices, as described in section 40.6.3.2.2 of HI 40.6-2014-B (incorporated by reference, see § 431.463), are only permitted to integrate up to the data collection interval used during testing.

D.2 Stabilization. Record data at any tested load point only under stabilized conditions, as defined in HI 40.6-2014-B section 40.6.5.5.1 (incorporated by reference, see § 431.463), where a minimum of two measurements are used to determine stabilization.

D.3 Test Points. Measure the flow rate in gpm, pump total head in ft, the driver power input in W, and the speed of rotation in rpm at each load point specified in Table 1 of this appendix for each DPPP variety and speed configuration:

E. Calculations

E.1 Determination of Weighted Energy Factor. Determine the WEF as a ratio of the measured flow and driver power input to the dedicated-purpose pool pump in accordance with the following equation:

Where: WEF = Weighted Energy Factor in kgal/kWh; Wi = weighting factor at each load point i, as specified in section E.2 of this appendix; Qi = flow at each load point i, in gpm; Pi = driver power input to the motor (or controls, if present) at each load point i, in watts; i = load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix; and n = number of load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix.

E.2 Weights. When determining WEF, apply the weights specified in Table 2 of this appendix for the applicable load points, DPPP varieties, and speed configurations:

E.3 Determination of Horsepower and True Power Factor Metrics

E.3.1 Determine the pump power output at any load point i using the following equation:

Where: Pu,i = the measured pump power output at load point i of the tested pump, in hp; Qi = the measured flow rate at load point i of the tested pump, in gpm; Hi = pump total head at load point i of the tested pump, in ft; and SG = the specific gravity of water at specified test conditions, which is equivalent to 1.00.

E.3.1.1 Determine the rated hydraulic horsepower as the pump power output measured on the reference curve at maximum rotating speed and full impeller diameter for the rated pump.

E.3.2 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, determine the dedicated-purpose pool pump nominal motor horsepower as the product of the measured full load speed and torque, adjusted to the appropriate units, as shown in the following equation:

Where: Pnm = the dedicated-purpose pool pump nominal total horsepower at full load, in hp; T = output torque at full load, in lb-ft; and n = the motor speed at full load, in rpm.

Full-load speed and torque shall be determined based on the maximum continuous duty motor power output rating allowable for the motor's nameplate ambient rating and insulation class.

E.3.2.1 For single-phase AC motors, determine the measured speed and torque at full load according to either section E.3.2.1.1 or E.3.2.1.2 of this appendix.

E.3.2.1.1 Use the procedures in section 3.2, “Tests with load”; section 4 “Testing facilities”; section 5.2 “Mechanical measurements”; section 5.3 “Temperature measurements”; and section 6 “Tests” of IEEE 114-2010 (incorporated by reference, see § 431.463), or

E.3.2.1.2 Use the applicable procedures in section 5, “General test requirements” and section 6, “Tests” of CSA C747-2009 (RA 2014); except in section 6.4(b) the conversion factor shall be 5252, only measurements at full load are required in section 6.5, and section 6.6 shall be disregarded (incorporated by reference, see § 431.463).

E.3.2.2 For DC motors, determine the measured speed and torque at full load according to either section E.3.2.2.1 or E.3.2.2.2 of this appendix.

E.3.2.2.1 Use the procedures in section 3.1, “Instrument Selection Factors”; section 3.4 “Power Measurement”: Section 3.5 “Power Sources”; section 4.1.2 “Ambient Air”; section 4.1.4 “Direction of Rotation”; section 5.4.1 “Reference Conditions”; and section 5.4.3.2 “Dynomometer or Torquemeter Method” of IEEE 113-1985 (incorporated by reference, see § 431.463), or

E.3.2.2.2 Use the applicable procedures in section 5, “General test requirements” and section 6, “Tests” of CSA C747-2009 (RA 2014); except in section 6.4(b) the conversion factor shall be 5252, only measurements at full load are required in section 6.5, and section 6.6 shall be disregarded (incorporated by reference, see § 431.463).

E.3.3 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, the dedicated-purpose pool pump service factor is equal to 1.0.

E.3.4 Determine the dedicated-purpose pool pump motor total horsepower according to section E.3.4.1 of this appendix for dedicated-purpose pool pumps with single-phase AC motors or DC motors and section E.3.4.2 of this appendix for dedicated-purpose pool pumps with polyphase AC motors.

E.3.4.1 For dedicated-purpose pool pumps with single-phase AC motors or DC motors, determine the dedicated-purpose pool pump motor total horsepower as the product of the dedicated-purpose pool pump nominal motor horsepower, determined in accordance with section E.3.2 of this appendix, and the dedicated-purpose pool pump service factor, determined in accordance with section E.3.3 of this appendix.

E.3.4.2 For dedicated-purpose pool pumps with polyphase AC induction motors, determine the dedicated-purpose pool pump motor total horsepower as the product of the rated nominal motor horsepower and the rated service factor of the motor.

E.3.5 Determine the true power factor at each applicable load point specified in Table 1 of this appendix for each DPPP variety and speed configuration as a ratio of driver power input to the motor (or controls, if present) (Pi), in watts, divided by the product of the voltage in volts and the current in amps at each load point i, as shown in the following equation:

Where: PFi = true power factor at each load point i, dimensionless; Pi = driver power input to the motor (or controls, if present) at each load point i, in watts; Vi = voltage at each load point i, in volts; Ii = current at each load point i, in amps; and i = load point(s), defined uniquely for each DPPP variety and speed configuration as specified in section D.3 of this appendix.

E.4 Determination of Maximum Head. Determine the maximum head for self-priming pool filter pumps, non-self-priming pool filter pumps, and waterfall pumps by measuring the head at maximum speed and the minimum flow rate at which the pump is designed to operate continuously or safely, where the minimum flow rate is assumed to be zero unless stated otherwise in the manufacturer literature.

F. Determination of Self-Priming Capability

F.1 Test Method. Determine the vertical lift and true priming time of non-self-priming pool filter pumps and self-priming pool filter pumps that are not already certified as self-priming under NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) by testing such pumps pursuant to section C.3 of appendix C of NSF/ANSI 50-2015, except for the modifications and exceptions listed in the following sections F.1.1 through F.1.5 of this appendix:

F.1.1 Where section C.3.2, “Apparatus,” and section C.3.4, “Self-priming capability test method,” of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463) state that the “suction line must be essentially as shown in annex C, figure C.1;” the phrase “essentially as shown in Annex C, figure C.1” means:

(1) The centerline of the pump impeller shaft is situated a vertical distance equivalent to the specified vertical lift (VL), calculated in accordance with section F.1.1.1. of this appendix, above the water level of a water tank of sufficient volume as to maintain a constant water surface level for the duration of the test;

(2) The pump draws water from the water tank with a riser pipe that extends below the water level a distance of at least 3 times the riser pipe diameter (i.e., 3 pipe diameters);

(3) The suction inlet of the pump is at least 5 pipe diameters from any obstructions, 90° bends, valves, or fittings; and

(4) The riser pipe is of the same pipe diameter as the pump suction inlet.

F.1.1.1 The vertical lift (VL) must be normalized to 5.0 feet at an atmospheric pressure of 14.7 psia and a water density of 62.4 lb/ft 3 in accordance with the following equation:

Where: VL = vertical lift of the test apparatus from the waterline to the centerline of the pump impeller shaft, in ft; ρtest = density of test fluid, in lb/ft 3; and Pabs,test = absolute barometric pressure of test apparatus location at centerline of pump impeller shaft, in psia.

F.1.2 The equipment accuracy requirements specified in section B, “Measurement Equipment,” of this appendix also apply to this section F, as applicable.

F.1.2.1 All measurements of head (gauge pressure), flow, and water temperature must be taken at the pump suction inlet and all head measurements must be normalized back to the centerline of the pump impeller shaft in accordance with section A.3.1.3.1 of HI 40.6-2014-B (incorporated by reference, see § 431.463).

F.1.3 All tests must be conducted with clear water that meets the requirements adopted in section C.3 of this appendix.

F.1.4 In section C.3.4, “Self-priming capability test method,” of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463), “the elapsed time to steady discharge gauge reading or full discharge flow” is determined when the changes in head and flow, respectively, are within the tolerance values specified in table 40.6.3.2.2, “Permissible amplitude of fluctuation as a percentage of mean value of quantity being measured at any test point,” of HI 40.6-2014-B (incorporated by reference, see § 431.463). The measured priming time (MPT) is determined as the point in time when the stabilized load point is first achieved, not when stabilization is determined. In addition, the true priming time (TPT) is equivalent to the MPT.

F.1.5 The maximum true priming time for each test run must not exceed 10.0 minutes. Disregard section C.3.5 of NSF/ANSI 50-2015 (incorporated by reference, see § 431.463).

G. Optional Testing and Calculations

G.1 Replacement Dedicated-Purpose Pool Pump Motors. To determine the WEF for replacement DPPP motors, test each replacement DPPP motor paired with each dedicated-purpose pool pump bare pump for which the replacement DPPP motor is advertised to be paired, as stated in the manufacturer's literature for that replacement DPPP motor model, according to the testing and calculations described in sections A, B, C, D, and E of this appendix. Alternatively, each replacement DPPP motor may be tested with the most consumptive dedicated-purpose pool pump bare pump for which it is advertised to be paired, as stated in the manufacturer's literature for that replacement DPPP motor model. If a replacement DPPP motor is not advertised to be paired with any specific dedicated-purpose pool pump bare pumps, test with the most consumptive dedicated-purpose pool pump bare pump available.

[82 FR 36924, Aug. 7, 2017]

Note 1 to appendix D to subpart Y of part 431:

Beginning March 20, 2023, any representations made with respect to the energy use or efficiency of circulator pumps subject to testing pursuant to 10 CFR 431.464(c) must be made in accordance with the results of testing pursuant to this appendix.

0. Incorporation by Reference

DOE incorporated by reference in § 431.463 the entire standard for HI 40.6-2021 and for HI 41.5-2022. However, not all provisions of HI 40.6-2021 and HI 41.5-2022 apply to this appendix. If there is any conflict between any industry standard and this appendix, follow the language of the test procedure in this appendix, disregarding the conflicting industry standard language.

0.1 Specifically, the following provisions of HI 40.6-2021 are not applicable:

(a) Section 40.6.4—Considerations when determining the efficiency of certain pumps, Section 40.6.4.1—Vertically suspended pumps (b) Section 40.6.4—Considerations when determining the efficiency of certain pumps, Section 40.6.4.2—Submersible pumps (c) Section 40.6.5—Test procedures, Section 40.6.5.3—Test report (d) Section 40.6.5—Test procedures, Section 40.6.5.5—Test conditions, Section 40.6.5.5.2—Speed of rotation during test (e) Section 40.6.6—Analysis, Section 40.6.6.1—Translation of the test results to the specified speed of rotation (f) Section 40.6.6—Analysis, Section 40.6.6.1—Translation of the test results to the specified speed of rotation, Section 40.6.6.1.1—Translation of the test results into data based on specified speed of rotation (g) Appendix B—Reporting of test results (h) Appendix G—DOE compared to HI 40.6 nomenclature

0.2 Specifically, only the following provisions of HI 41.5-2022 are applicable:

(a) Section 41.5.3.4.1—Determination of CER—Full Speed (b) Section 41.5.3.4.2—Determination of CER—Pressure Speed Control (c) Section 41.5.3.4.3—Determination of CER—Temperature Speed Control (d) Section 41.5.3.4.4.1—Determination of CER—External Input Signal Speed Control Only (e) Section 41.5.3.4.4.2—Determination of CER—External Input Signal Speed Control Operated With Other Control Methods (f) Section 41.5.3.4.5—Determination of CER—Manual Speed Control 1. General

To determine the circulator energy index (CEI), testing shall be performed in accordance with HI 40.6-2021, including Appendix E “Testing Circulator Pumps,” with the exceptions noted in section 0.1 of this appendix and the modifications and additions as noted throughout the following provisions. For the purposes of applying this appendix, the term “pump power output,” as defined in section 40.6.2, “Terms and definitions,” of HI 40.6-2021 shall be deemed to be synonymous with the term “hydraulic horsepower” used throughout that standard and this appendix.

2. Scope

2.1 This appendix is applicable to all circulator pumps and describes how to calculate the circulator energy index (CEI; section F) based on the pump energy rating for the minimally compliant reference circulator pump (CERSTD) and the circulator energy rating (CER) determined in accordance with one of the test methods listed in Table I of this appendix based on a control variety with which the circulator pump is distributed in commerce.

2.2 If a given circulator pump model is distributed in commerce with multiple control varieties available, the manufacturer may select a control variety (or varieties) among those available with which to test the circulator pump, including the test method for circulator pumps at full speed or circulator pumps without external input signal, manual, pressure, or temperature controls).

3. Measurement Equipment

For the purposes of measuring flow rate, head, driver power input, and pump power output, the equipment specified in HI 40.6-2021 Appendix C must be used and must comply with the stated accuracy requirements in HI 40.6-2021 Table 40.6.3.2.3. When more than one instrument is used to measure a given parameter, the combined accuracy, calculated as the root sum of squares of individual instrument accuracies, must meet the specified accuracy requirements.

4. Test Conditions

4.1 Pump specifications. Conduct testing in accordance with the test conditions, stabilization requirements, and specifications of HI 40.6-2021 section 40.6.3, “Pump efficiency testing”; section 40.6.4, “Considerations when determining the efficiency of a pump,” including section 40.6.4.4, “Determination of pump overall efficiency”; section 40.6.5.4 (including Appendix A), “Test arrangements”; and section 40.6.5.5, “Test conditions.”

4.2 Twin head circulator pump. To test twin head circulator pumps, one of the two impeller assemblies should be incorporated into an adequate, single impeller volute and casing. An adequate, single impeller volute and casing means a volute and casing for which any physical and functional characteristics that affect energy consumption and energy efficiency are essentially identical to their corresponding characteristics for a single impeller in the twin head circulator pump volute and casing.

4.3 Circulator-less-volute. To determine the CEI for a circulator-less-volute, test each circulator-less-volute with each volute for which the circulator-less-volute is offered for sale or advertised to be paired for that circulator pump model according to the testing and calculations described in the applicable test method listed in Table 1 of this appendix, depending on the variety of control with which the circulator pump model is distributed in commerce. Alternatively, each circulator-less-volute may be tested with the most consumptive volute with which is it offered for sale or advertised to be paired for that circulator pump model.

5. Data Collection and Analysis

5.1 Stabilization. Record data at any test point only under stabilized conditions, as defined in HI 40.6-2021 section 40.6.5.5.1.

5.2 Testing BEP at maximum speed for the circulator pump. Determine the BEP of the circulator pump at maximum speed as specified in Appendix E of HI 40.6-2021 including sections 40.6.5.5.1 and 40.6.6 as modified. Determine the BEP flow rate at maximum speed as the flow rate at the operating point of maximum overall efficiency on the circulator pump curve, as determined in accordance with section 40.6.6.3 of HI 40.6-2021 as modified by Appendix E, where overall efficiency is the ratio of the circulator pump power output divided by the driver power input, as specified in Table 40.6.2.1 of HI 40.6-2021. For the purposes of this test procedure, all references to “driver power input” in this appendix or HI 40.6-2021 shall refer to the input power to the controls, or to the motor if no controls are present.

5.3 Rounding. All terms and quantities refer to values determined in accordance with the procedures set forth in this appendix for the rated circulator pump. Perform all calculations using raw measured values without rounding. Round CER to three significant figures. Round CEI to the hundredths decimal place. Round rated hydraulic horsepower to the less precise of the following two values: three significant figures; the fourth decimal place when expressed in units of horsepower.

6. Calculation of CEI

Determine CEI using the following equation:

Where: CEI = the circulator energy index (dimensionless); CER = the circulator energy rating determined in accordance with Table 1 of this appendix (hp); and CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the tested pump, as determined in accordance with the specifications at paragraph (i) of § 431.465. 7. Determination of Additional Circulator Performance Parameters

7.1 To determine flow and head at BEP; pump power output (hydraulic horsepower) and driver power input at load points used in the calculation of CEI, including the rated hydraulic horsepower; and any other reported performance parameters, conduct testing according to section 1 of this appendix.

7.2 Determine the rated hydraulic horsepower as the pump power output measured at BEP and full impeller diameter for the rated pump.

7.3 Determine the true power factor at each applicable load point specified in the applicable test method listed in Table 1 of this appendix for each circulator pump control variety as a ratio of driver power input to the motor (or controls, if present) (Pi), in watts, divided by the product of the true RMS voltage in volts and the true RMS current in amps at each load point i, as shown in the following equation:

Where: PFi = true power factor at each load point i, dimensionless; Pi = driver power input to the motor (or controls, if present) at each load point i, in watts; Vi = true RMS voltage at each load point i, in volts; Ii = true RMS current at each load point i, in amps; and i = load point(s), defined uniquely for each circulator pump control variety as specified in the applicable test method listed in Table 1 of this appendix. [87 FR 57299, Sept. 19, 2022]