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Electronic Code of Federal Regulations

e-CFR data is current as of December 5, 2019

Title 40Chapter ISubchapter CPart 63Subpart PPPPP → Appendix


Title 40: Protection of Environment
PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES (CONTINUED)
Subpart PPPPP—National Emission Standards for Hazardous Air Pollutants for Engine Test Cells/Stands


Table 2 to Subpart PPPPP of Part 63—Operating Limits

If you are required to comply with operating limits in §63.9302, you must comply with the applicable operating limits in the following table:

For the following device .  .  . You must meet the following operating limit .  .  . and you must demonstrate continuous compliance with the operating limit by .  .  .
1. Thermal oxidizera. The average combustion temperature in any 3-hour period must not fall below the combustion temperature limit established according to §63.9324(a)i. Collecting the combustion temperature data according to §63.9306(c);
ii. Reducing the data to 3-hour block averages; and
iii. Maintaining the 3-hour average combustion temperature at or above the temperature limit.
2. Catalytic oxidizera. The average temperature measured just before the catalyst bed in any 3-hour period must not fall below the limit established according to §63.9324(b)i. Collecting the temperature data according to §63.9306(c);
ii. Reducing the data to 3-hour block averages; and
iii. Maintaining the 3-hour average temperature before the catalyst bed at or above the temperature limit.
   b. Either ensure that the average temperature difference across the catalyst bed in any 3-hour period does not fall below the temperature difference limit established according to §63.9324(b)(2) or develop and implement an inspection and maintenance plan according to §63.9324(b)(3) and (4)i. Either collecting the temperature data according to §63.9306(c), reducing the data to 3-hour block averages, and maintaining the 3-hour average temperature difference at or above the temperature difference limit; or
ii. Complying with the inspection and maintenance plan developed according to §63.9324(b)(3) and (4).
3. Emission capture system that is a PTE according to §63.9322(a)a. The direction of the air flow at all times must be into the enclosure; and eitheri. Collecting the direction of air flow; and either the facial velocity of air through all natural draft openings according to §63.9306(d)(1) or the pressure drop across the enclosure according to §63.9306(d)(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; orFollow the requirements in 3ai and ii 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 51Follow the requirements in 3ai and ii of this table.
4. Emission capture system that is not a PTE according to §63.9322(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 §63.9306(d)i. Collecting the gas volumetric flow rate or duct static pressure for each capture device according to §63.9306(d);
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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