In metal HAP service

In metal HAP service means that a process vessel or piece of equipment either contains or contacts a feedstock, byproduct, or product that contains metal HAP. A process vessel is no longer in metal HAP service after the vessel has been emptied to the extent practicable (i.e., a vessel with liquid left on process vessel walls or as bottom clingage, but not in pools, due to floor irregularity, is considered completely empty) and any cleaning has been completed.

Source

40 CFR § 63.11502

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Scoping language

The following terms used in this subpart have the meaning given them in the CAA, 63.2, subpart SS ( 63.981), subpart WW ( 63.1061), 40 CFR 60.111b, subpart F ( 63.101), subpart G ( 63.111), subpart FFFF ( 63.2550), as specified after each term:

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