Process vent

Process vent means the point of discharge to the atmosphere (or the point of entry into a control device, if any) of a gas stream from a unit operation within a source category subject to this subpart. Process vent excludes the following gas stream discharges:
(1) Relief valve discharges;
(2) Leaks from equipment subject to this subpart;
(3) Gas streams exiting a control device complying with this subpart;
(4) Gas streams transferred to other processes (on-site or off-site) for reaction or other use in another process (i.e., for chemical value as a product, isolated intermediate, byproduct, or co-product for heat value);
(5) Gas streams transferred for fuel value (i.e., net positive heating value), use, reuse, or sale for fuel value, use, or reuse. On or after November 19, 2021 this exclusion no longer applies to the Carbon Black Production source category;
(6) Gas streams from storage vessels or transfer racks subject to this subpart;
(7) Gas streams from waste management units subject to this subpart;
(8) Gas streams from wastewater streams subject to this subpart;
(9) Gas streams exiting process analyzers; and
(10) Gas stream discharges that contain less than or equal to 0.005 weight-percent total organic HAP.

Source

40 CFR § 63.1101

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Scoping language

All terms used in this subpart shall have the meaning given them in the Act, in 40 CFR 63.2 (General Provisions), and in this section. The definitions in this section do not apply to waste requirements for ethylene production sources.

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