| Source
| Location of definition
| 1. Organic Process Equipment in Volatile Hazardous Air Pollutant Service at Chemical Plants and Other Designated Facilities | 56 FR 9315, March 6, 1991, Announcement of Negotiated Rulemaking
| a. All valves in gas or light liquid service within a process unit
| | b. All pumps in light liquid service within a process unit
| | c. All connectors in gas or light liquid service within a process unit
| | d. Each compressor
| | e. Each product accumulator vessel
| | f. Each agitator
| | g. Each pressure relief device
| | h. Each open-ended valve or line
| | i. Each sampling connection system
| | j. Each instrumentation system
| | k. Each pump, valve, or connector in heavy liquid service
| | l. Each closed vent system and control device | |
