40 CFR Appendix Table 7 to Subpart U of Part 63 - Operating Parameters for Which Monitoring Levels Are Required To Be Established for Continuous and Batch Front-End Process Vents and Aggregate Batch Vent Streams

Control/recovery device	Parameters to be monitored	Established operating parameter(s)
Thermal incinerator	Firebox temperature	Minimum temperature.
Thermal oxidizers used for vents in chloroprene service	Combustion chamber temperature	Minimum temperature.
Thermal oxidizers used for vents in chloroprene service	Flue gas flow rate	Maximum flue gas flow rate.
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.
Scrubber for halogenated vents	pH of scrubber effluent; and scrubber liquid and gas flow rates [§ 63.489(b)(4)(ii)]	Minimum pH; and minimum liquid/gas ratio.
Absorber	Exit temperature of the absorbing liquid; and exit specific gravity of the absorbing liquid	Maximum temperature; and maximum specific gravity.
Condenser	Exit temperature	Maximum temperature.
Carbon adsorber	Total regeneration steam flow or nitrogen flow, or pressure (gauge or absolute) a during carbon bed regeneration cycle; and temperature of the carbon bed after regeneration (and within 15 minutes of completing any cooling cycle(s))	Maximum flow or pressure; and maximum temperature.
Sorbent injection	Sorbent injection rate	Minimum injection rate.
Sorbent injection	Carrier gas flow rate	Minimum carrier gas flow rate.
Other devices (or as an alternate to the above) b	HAP concentration level or reading at outlet of device	Maximum HAP concentration or reading.

a 25 to 50 mm (absolute) is a common pressure level obtained by pressure swing absorbers.

b Concentration is measured instead of an operating parameter.

[89 FR 43267, May 16, 2024]