- Table 1 to Subpart NNNN of Part 63—Operating Limits if Using the Emission Rate With Add-On Controls Option
If you are required to comply with operating limits by § 63.4092, you must comply with the applicable operating limits in the following table:
| For following device . . . | You must meet the following operating limit . . . | And you must demonstrate continuous compliance with the operating limit by . . . | 1. thermal oxidizer | a. the average combustion temperature in any 3-hour period must not fall below the combustion temperature limit established according to § 63.4167(a) | i. collecting the combustion temperature data according to § 63.4168(c);
ii. reducing the data to 3-hour block averages; and iii. maintaining the 3-hour average combustion temperature at or above the combustion temperature limit. | 2. catalytic oxidizer | a. the average temperature measured just before the catalyst bed in any 3-hour period must not fall below the limit established according to § 63.4167(b); and either | i. collecting the temperature data according to § 63.4168(c);
ii. reducing the data to 3-hour block before the averages; and iii. maintaining the 3-hour average temperature before the catalyst bed at or above the temperature limit. | b. ensure that average temperature difference across the catalyst bed in any 3-hour period does not fall below the temperature difference limit established according to § 63.4167(b)(2); or | i. collecting the temperature data according to § 63.4168(c);
ii. reducing the data to 3-hour block difference across averages; and iii. maintaining the 3-hour average temperature difference at or above the temperature difference limit. | c. develop and implement an inspection and maintenance plan according to § 63.4167(b)(4) | i. maintaining an up-to-date inspection and maintenance plan, records of annual catalyst activity checks, records monthly inspections of the oxidizer system, and records of the annual internal inspections of the catalyst bed. If a problem is discovered during a monthly or annual inspection required by § 63.4167(b)(4), you must take corrective action as soon as practicable consistent with the manufacturer's recommendations. | 3. carbon adsorber | a. the total regeneration desorbing gas (e.g., steam or nitrogen) mass flow for each carbon bed regeneration cycle must not fall below the total regeneration desorbing gas mass flow limit established according to § 63.4167(c) | i. measuring the total regeneration desorbing gas (e.g., steam or nitrogen) mass flow for each regeneration cycle according to § 63.4168(d); and
ii. maintaining the total regeneration desorbing gas mass flow at or above the mass flow limit. | b. the temperature of the carbon bed, after completing each regeneration and any cooling cycle, must not exceed the carbon bed temperature limit established according to § 63.4167(c) | i. measuring the temperature of the carbon bed after completing each regeneration and any cooling cycle according to § 63.4168(d); and
ii. operating the carbon beds such that each carbon bed is not returned to service until the recorded temperature of the carbon bed is at or below the temperature limit. | 4. condenser | a. the average condenser outlet (product side) gas temperature in any 3-hour period must not exceed the temperature limit established according to § 63.4167(d) | i. collecting the condenser outlet (product side) gas temperature according to § 63.4168(e);
ii. reducing the data to 3-hour block averages; and iii. maintaining the 3-hour average gas exceed the temperature at the outlet at or below the temperature limit. | 5. concentrators, including zeolite wheels and rotary carbon adsorbers | a. the average gas temperature of the desorption concentrate stream in any 3-hour period must not fall below the limit established according to § 63.4167(e) | i. collecting the temperature data according to 63.4168(f);
ii. reducing the data to 3-hour block averaged; and iii. maintaining the 3-hour average temperature at or above the temperature limit. | b. the average pressure drop of the dilute stream across the concentrator in any 3-hour period must not fall below the limit established according to § 63.4167(e) | i. collecting the pressure drop data according to 63.4168(f); and
ii. reducing the pressure drop data to across the 3-hour block averages; and iii. maintaining the 3-hour average pressure drop at or above the pressure drop limit. | 6. emission capture system that is a PTE according to § 63.4165(a) | a. the direction of the air flow at all times must be into the enclosure; and either | i. collecting the direction of air flow, and either the facial velocity of air through all natural draft openings according to § 63.4168(g)(1) or the pressure drop across the enclosure according to § 63.4168(g)(2); and
ii. maintaining the facial velocity of air flow through all natural draft openings or the pressure drop at or above the facial velocity limit or pressure drop limit, and maintaining the direction of air flow into the enclosure at all times. | b. the average facial velocity of air through all natural draft openings in the enclosure must be at least 200 feet per minute; or | See item 6.a. of this table. | c. the pressure drop across the enclosure must be at least 0.007 inch H2O, as established in Method 204 of appendix M to 40 CFR part 51 | See item 6.a. of this table. | 7. emission capture system that is not a PTE according to § 63.4165(a) | a. the average gas volumetric flow rate or duct static pressure in each duct between a capture device and add-on control device inlet in any 3-hour period must not fall below the average volumetric flow rate or duct static pressure limit established for that capture device according to § 63.4167(f) | i. collecting the gas volumetric flow rate or duct static pressure for each capture device according to § 63.4168(g);
ii. reducing the data to 3-hour block averages; and iii. maintaining the 3-hour average gas volumetric flow rate or duct static pressure for each capture device at or above the gas volumetric flow rate or duct static pressure limit. |
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