Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart PPP > Appendix - Table 7 to Subpart PPP of Part 63—Operating Parameters for Which Monitoring Levels Are Required To Be Established for Process Vent Streams

Regulations last checked for updates: Apr 05, 2025

Title 40 - Protection of Environment last revised: Nov 05, 2025

Appendix - Table 7 to Subpart PPP of Part 63—Operating Parameters for Which Monitoring Levels Are Required To Be Established for Process Vent Streams

Control technique	Parameters to be monitored	Established operating parameter(s)
Thermal incinerator	Firebox temperature	Minimum temperature.
Catalytic incinerator	Temperature upstream and downstream of the catalyst bed	Minimum upstream temperature; and minimum temperature difference across the catalyst bed.
Boiler or process heater	Firebox temperature	Minimum temperature.
Absorber	Liquid flow rate or pressure drop; and pH of scrubber effluent, if an acid or base absorbent is used	Minimum flow rate or pressure drop; and maximum pH if an acid absorbent is used, or minimum pH if a base absorbent is used.
Condenser	Exit temperature	Maximum temperature.
Carbon adsorber	Total regeneration stream mass or volumetric flow during carbon bed regeneration cycle; and temperature of the carbon bed after regeneration (and within 15 minutes of completing any cooling cycle(s))	Maximum mass or volumetric flow; and maximum temperature.
Extended Cookout (ECO)	Time from the end of the epoxide feed to the end of the ECO, or the reactor epoxide partial pressure at the end of the ECO, or the epoxide concentration in the reactor liquid at the end of the ECO	Minimum duration, or maximum partial pressure at the end of ECO, or maximum epoxide concentration in the reactor liquid at the end of ECO.
Other devices (or as an alternate to the above). ^a	HAP concentration level or reading at outlet of device	Maximum HAP concentration or reading.

^a Concentration is measured instead of an operating parameter.

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.