(1) CAS number. Chemical Abstracts Service registration number assigned to specific chemicals, isomers, or mixtures of chemicals.

(2) Component. Any piece of process unit equipment which has the potential to leak a chemical listed in section 236.8, table 1, of this Part when monitored as prescribed by section 236.7 of this Part. These include, but are not limited to: pumps, compressors, valves, open- ended pipes, and pressure relief devices. Excluded from these are valves which are not externally operated.

(3) Department. The New York State Department of Environmental Conservation.

(4) Double block-and-bleed system. Two block valves connected in series with a bleed valve or line that can vent the line between the two block valves.

(5) Initial attempt to repair. To take rapid action to repair leaks. These include, but are not limited to: tightening or replacing bonnet bolts, tightening packing bolts or glands, or injecting lubricant into lubricated packing.

(6) In gas/vapor service. Any equipment which processes, transfers, or contains a chemical or mixture of chemicals in the gaseous phase having a concentration greater than 10 percent by weight of the chemicals listed in section 236.8, table 1, of this Part.

(7) In heavy liquid service. Any equipment which processes, transfers, or contains a fluid and is not in gas/vapor or light liquid service.

(8) In light liquid service. Any equipment which processes, transfers, or contains a fluid having a vapor pressure greater than 0.3 kilopascals at 20°C (0.0427 psia at 68°F) and having a concentration greater than 10 percent by weight of the chemicals listed in section 236.8, table 1, of this Part.

(9) In vacuum service. Equipment operating at an internal pressure at least 5 kilopascals (0.712 psia) below ambient pressure.

(10) Leak. The emission of a chemical listed in section 236.8, table 1, of this Part at a concentration greater than or equal to 10,000 parts per million by volume (ppmv) as shown by monitoring. An indication of liquids dripping shall also be considered a leak.

(11) Liquids dripping. Any visible leakage from a seal or opening including, but not limited to: dripping, spraying, misting, clouding, or ice formation.

(12) Open-ended valve or line. Any valve having one side of the valve seat in contact with the process fluid and one side open to the atmosphere either directly or through open piping. Pressure relief valves are an exception to this definition.

(13) Process unit. Components assembled to produce, as an intermediate or final product, one or more of the chemicals listed in section 236.8, table 1, of this Part.

(14) Process unit shutdown. A scheduled work practice or operational procedure that stops production from all or part of a process unit. Process unit shutdowns do not include unscheduled work practice or operational procedures that stop production from all or part of a process unit for less than 24 hours, or the use of spare equipment or a technically feasible bypass without stopping production.

(15) Repair. To adjust or otherwise alter a component to eliminate a leak.

(16) Synthetic organic chemical manufacturing facility. A facility which manufactures, as an intermediate or final product, one or more of the synthetic organic chemicals, polymers and resins listed in section 236.8, table 1, of this Part.