Regulations last checked for updates: Oct 18, 2024

Title 46 - Shipping last revised: Oct 15, 2024
§ 63.25-1 - Small automatic auxiliary boilers.

Small automatic auxiliary boilers defined as having heat-input ratings of 400,000 Btu/hr. or less (117 kilowatts or less) must also meet the following requirements.

(a) Small automatic auxiliary boilers must be equipped with a visual indicator which indicates when the low water cutoff has activated.

(b) A prepurge period of a sufficient duration to ensure at least four changes of air in the combustion chamber and stack, but not less than 15 seconds must be provided. Ignition must occur only before or simultaneously with the opening of the fuel oil valve.

[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2003-16630, 73 FR 65191, Oct. 31, 2008]
§ 63.25-3 - Electric hot water supply boilers.

(a) Electric hot water supply boilers that have a capacity not greater than 454 liters (120 U.S. gallons), a heat input rate not greater than 200,000 Btu/hr. (58.6 kilowatts), meet the requirements of UL 174 or UL 1453 (both incorporated by reference, see § 63.05-1), and are protected by the relief device(s) required in § 53.05-2 of this subchapter do not have to meet any other requirements of this section except the periodic testing required by paragraph (j) of this section. Electric hot water supply boilers that meet the requirements of UL 174 may have temperature-pressure relief valves that meet the requirements of ANSI Z21.22 (incorporated by reference, see 4 § 63.05-1) in lieu of subpart 53.05 of this subchapter.

(b) Each hot water supply boiler must be constructed in accordance with the applicable requirements of part 52 or part 53 of this subchapter.

(c) Branch circuit conductors for hot water supply boilers which have a capacity not greater than 454 liters (120 U.S. gallons) must have a current carrying capacity of not less than 125 percent of the current rating of the appliance. Branch circuit conductors for hot water supply boilers with capacities of more than 454 liters (120 U.S. gallons) must have a current carrying capacity of not less than 100 percent of the current rating of the appliance. Wiring materials and methods must comply with subpart 111.60 of this chapter. A hot water supply boiler having a current rating of more than 48 amperes and employing resistance type heating elements must have the heating elements on subdivided circuits. Each subdivided load, except for an electric hot water supply boiler employing a resistance type immersion electric heating element, must not exceed 48 amperes, and it must be protected at not more than 60 amperes. An electric hot water supply boiler employing a resistance type immersion electric heating element may be subdivided into circuits not exceeding 120 amperes and protected at not more than 150 amperes. Overcurrent protection devices must comply with subpart 111.50 of this chapter.

(d) Heating elements must be insulated electrically from the water being heated, guarded against mechanical injury and contact with outside objects, and securely supported. Consideration must be given to sagging, opening, and other adverse conditions of the elements resulting from continuous heating, and flexion of supports and wiring due to alternate heating and cooling. Wrap-around elements must be secured in a manner which prevents loosening.

(e) Iron and steel parts must be protected against corrosion by enameling, galvanizing, or plating. Iron and steel storage tanks having a wall thickness less than 6.4mm ( 1/4-inch) must have the inside surface protected against corrosion.

(f) Each heating element must have a temperature regulating device. The device must limit the water from obtaining a temperature greater than 90 °C (194 °F). If the control has a marked off position, the control must disconnect the heating element from all ungrounded conductors, and it must not respond to temperature when placed in the off position.

(g) An independent temperature limiting device must prevent the water in the upper 25 percent of the tank from attaining a temperature higher than 99 °C (210 °F). This device must require manual resetting, be trip free from the operating means, open all ungrounded power supply conductors to the heater, and be readily accessible.

(h) Electric hot water supply boilers must have pressure and temperature relieving valves. The valve temperature setting must not be more than 99 °C (210 °F). The pressure relief setting must not be higher than the marked working pressure of the boiler. The pressure and temperature relief valves must meet subpart 53.05 of this subchapter. The pressure and temperature relief valves may be combined into a pressure-temperature relief valve.

(i) Electric hot water supply boilers must be marked in a visible location with the manufacturer's name, model or other identification number, water capacity, and the electrical ratings of each heating element. When two or more heating elements are installed, the maximum wattage or current consumption must be indicated. The cold water inlet and the hot water outlet must each be clearly distinguished or marked for identification purposes.

(j) All electric hot water supply boilers must have their pressure relief devices tested as required by part 52 or part 53 of this subchapter, as applicable. Electric hot water supply boilers that meet the requirements of UL 174 or UL 1453 and have heating elements, temperature regulating controls, and temperature limiting controls are satisfactory for installation and service without further installation testing. All electric hot water supply boilers not meeting the requirements of UL 174 or UL 1453 must have their heating elements, temperature regulating controls, and temperature limiting controls tested by the marine inspector at the time of installation.

[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by CGD 95-028, 62 FR 51202, Sept. 30, 1997; USCG-2003-16630, 73 FR 65191, Oct. 31, 2008; USCG-2020-0634, 89 FR 50198, June 12, 2024]
§ 63.25-5 - Fired thermal fluid heaters.

(a) Construction. Fired thermal fluid heaters must meet the requirements of part 52 of this subchapter, as applicable.

(b) Controls. Fired thermal fluid heaters must have a low fluid level cutout device or a low flow device. When the rate of fluid flow through the heating coils is insufficient to ensure proper heat transfer, the device must cut off the fuel supply to the burner. If the fluid temperature exceeds the designed maximum operating temperature, a high temperature limit device must cut off the fuel supply to the burner. These devices must be of the manual reset type.

[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2020-0634, 89 FR 50198, June 12, 2024]
§ 63.25-7 - Exhaust gas boilers.

(a) Construction. An auxiliary exhaust gas boiler must meet the applicable construction requirements of part 52 or part 53 of this subchapter as determined from table 1 to § 54.01-5 of this subchapter.

(b) Controls. Each drum type exhaust gas steam boiler must have a feed water control system. The system must automatically supply the required amount of feed water and maintain it at the proper level. For boilers without a fixed water level, the control system must supply the feed water at a rate sufficient to ensure proper heat transfer. The system must adequately fill the boiler when cold.

(c) Alarms. When a condition arises which results in inadequate heat transfer, a high temperature alarm or low flow alarm must be activated. An audible alarm must automatically sound, and a visual indicator must indicate when the fluid temperature exceeds the maximum operating temperature or when the fluid/steam flowing through the heat exchanger is insufficient to ensure proper heat transfer. Additionally, an audible alarm must automatically sound, and a visual indicator must indicate when a soot fire is present in the exhaust gas boiler's uptake.

[CGD 88-057, 55 FR 24237, June 15, 1990, as amended by USCG-2020-0634, 89 FR 50198, June 12, 2024]
§ 63.25-9 - Incinerators.

(a) General. (1) Incinerators installed on or after March 26, 1998, must meet the requirements of IMO MEPC.76(40) (incorporated by reference; see § 63.05-1). Incinerators in compliance with ISO 13617 (incorporated by reference; see § 63.05-1), are considered to meet IMO MEPC.76(40). Incinerators in compliance with both ASTM F1323 (incorporated by reference; see § 63.05-1) and Annexes A1-A3 of IMO MEPC.76(40) are considered to meet IMO MEPC.76(40).

(2) An application for type approval of shipboard incinerators must be sent to the Commanding Officer, Marine Safety Center, U.S. Coast Guard, 2703 Martin Luther King Jr. Ave. SE, Washington, DC 20593, or it may be transmitted by email to the Commanding Officer (MSC), at [email protected].

(b) Testing. Before type approval is granted, the manufacturer must submit evidence that tests have been conducted by an independent third party acceptable to the Commandant (CG-ENG). Testing may be conducted at the manufacturer's facility. The independent third party must:

(1) Have experienced and qualified personnel to conduct the inspections and tests required by this section;

(2) Have documented proof of the qualifications to perform the inspections and tests required by this section; and

(3) Not be owned or controlled by a manufacturer, supplier, or vendor of shipboard incinerators.

(c) Prohibited substances. Shipboard incineration of the following substances is prohibited:

(1) Annex I, II, and III cargo residues of IMO MARPOL 73/78 (incorporated by reference; see § 63.05-1) and related contaminated packing materials.

(2) Polychlorinated biphenyls (PCBs).

(3) Garbage, as defined in Annex V of IMO MARPOL 73/78, containing more than traces of heavy metals.

(4) Refined petroleum products containing halogen compounds.

(d) Operating manual. Each ship with an incinerator subject to this rule must possess a manufacturer's operating manual, which must specify how to operate the incinerator within the limits described in Annex A1.5 of IMO MEPC.76(40).

(e) Training. Each person responsible for operating any incinerator must be trained and be capable of implementing the guidance provided in the manufacturer's operating manual.

(f) Acceptable methods and standards for testing emissions. The methods and standards for testing emissions that the laboratory may use in determining emissions-related information described in Annex A1.5 of IMO MEPC.76(40) are:

(1) 40 CFR part 60 Appendix A, Method 1—Sample and velocity traverses for stationary sources;

(2) 40 CFR part 60 Appendix A, Method 3A—Determination of oxygen and carbon dioxide concentrations in emissions from stationary sources (instrumental-analyzer procedure);

(3) 40 CFR part 60 Appendix A, Method 5—Determination of particulate emissions from stationary sources;

(4) 40 CFR part 60 Appendix A, Method 9—Visual determination of the opacity of emissions from stationary sources;

(5) 40 CFR part 60 Appendix A, Method 10—Determination of carbon-monoxide emissions from stationary sources;

(6) ISO 9096 (incorporated by reference; see § 63.05-1); and

(7) ISO 10396 (incorporated by reference; see § 63.05-1).

(g) Incinerators designed and tested to meet the requirements of IMO MEPC.244(66) (incorporated by reference; see § 63.05-1) are considered equivalent to the requirements of this section and may receive U.S. Coast Guard type approval.

[USCG-2020-0634, 89 FR 50198, June 12, 2024]
authority: 46 U.S.C. 3306,3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3
source: CGD 88-057, 55 FR 24238, June 15, 1990, unless otherwise noted.
cite as: 46 CFR 63.25-7