Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 63, Subpt. VVVV, Tbl. 4 Table 4 to Subpart VVVV of Part 63—Operating Limits if Using an Add-on Control Device for Open Molding Operations

1. Thermal oxidizer

The average combustion temperature in any 3–hour period must not fall below the combustion temperature limit established according to § 63.5725(d)

a. Collecting the combustion temperature data according to § 63.5725(d); b. reducing the data to 3–hour block averages; and c. maintaining the 3–hour average combustion temperature at or above the temperature limit.

2. Other control devices

An operating limit approved by the Administrator according to § 63.8(f)

a. Collecting parameter monitoring as approved by the Administrator according to § 63.8(f); and b. maintaining the parameters within the operating limits approved according to § 63.8(f).

3. Emission capture system that is a PTE according to § 63.5719(b)

a. The direction of the air flow at all times must be into the enclosure; and b. in any 3–hour period, either the average facial velocity of air through all natural draft openings in the enclosure must be at least 200 feet per minute; or 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

i. Collecting the direction of air flow, and either the facial velocity of air through all natural draft openings according to § 63.5725(f)(3) or the pressure drop across the enclosure according to § 63.5725(f)(4); and ii. reducing the data for facial velocity or pressure drop to 3–hour block averages; and iii. maintaining the 3–hour average 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.

4. Emission capture system that is not a PTE according to § 63.5719(b)

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 § 63.5725(f)(5); and b. the average pressure drop across an opening in each enclosure in any 3–hour period must not fall below the average pressure drop limit established for that capture device according to § 63.5725(f)(5)

i. Collecting the gas volumetric flow rate or duct static pressure for each capture device according to § 63.5725(f)(1) and (3); ii. reducing the data to 3–hour block averages; 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; iv. collecting data for the pressure drop across an opening in each enclosure according to § 63.5725(f)(2) and (4); v. reducing the data to 3–hour block averages; and vi. maintaining the 3–hour average pressure drop across the opening for each enclosure at or above the gas volumetric flow rate or duct static pressure limit.