Process
Process (for the purposes of 82.25 only) means all equipment that collectively functions to engage in an activity listed in 82.25(2). A process may consist of one or more unit operations. For the purposes of 82.25, process includes any, all, or a combination of reaction, recovery, separation, purification, or other activity, operation, manufacture, or treatment which are used to engage in an activity listed in 82.25(b)(2). For a continuous process, cleaning operations may be considered part of the process at the discretion of the facility. For a batch process, cleaning operations are part of the process. Ancillary activities are not considered a process or part of any process under 82.25. Ancillary activities include boilers and incinerators, chillers and refrigeration systems, and other equipment and activities that are not directly involved (i.e., they operate within a closed system and materials are not combined with process fluids) in an activity listed in 82.25(b)(2).
Source
40 CFR § 82.3
Scoping language
As used in this subpart, the term: