In organic hazardous air pollutant service
In organic hazardous air pollutant service or in organic HAP service means that a piece of equipment either contains or contacts a fluid (liquid or gas) that is at least 5 percent by weight of total organic HAP as determined according to the provisions of 63.180 of this part and table 1 of this subpart. The provisions of 63.180(d) also specify how to determine that a piece of equipment is not in organic HAP service.
Source
40 CFR § 63.641
Scoping language
All terms used in this subpart shall have the meaning given them in the Clean Air Act, subpart A of this part, and in this section. If the same term is defined in subpart A and in this section, it shall have the meaning given in this section for purposes of this subpart.