- Table W-1E to Subpart W of Part 98—Default Whole Gas Leaker Emission Factors for Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting
| Equipment components | Emission factor
(scf/hour/component) | If you survey using any of the methods in § 98.234(a)(1)
through (6) | If you survey using Method 21
as specified in § 98.234(a)(7) | Leaker Emission Factors—All Components, Gas Service 1 | Valve | 4.9 | 3.5 | Flange | 4.1 | 2.2 | Connector (other) | 1.3 | 0.8 | Open-Ended Line 2 | 2.8 | 1.9 | Pressure Relief Valve | 4.5 | 2.8 | Pump Seal | 3.7 | 1.4 | Other 3 | 4.5 | 2.8 | Leaker Emission Factors—All Components, Light Crude Service 1 | Valve | 3.2 | 2.2 | Flange | 2.7 | 1.4 | Connector (other) | 1.0 | 0.6 | Open-Ended Line | 1.6 | 1.1 | Pump | 3.7 | 2.6 | Agitator Seal | 3.7 | 2.6 | Other 3 | 3.1 | 2.0 | Leaker Emission Factors—All Components, Heavy Crude Service 1 | Valve | 3.2 | 2.2 | Flange | 2.7 | 1.4 | Connector (other) | 1.0 | 0.6 | Open-Ended Line | 1.6 | 1.1 | Pump | 3.7 | 2.6 | Agitator Seal | 3.7 | 2.6 | Other 3 | 3.1 | 2.0 |
|---|
1 For multi-phase flow that includes gas, use the gas service emission factors.
2 The open-ended lines component type includes blowdown valve and isolation valve leaks emitted through the blowdown vent stack for centrifugal and reciprocating compressors.
3 “Others” category includes any equipment leak emission point not specifically listed in this table, as specified in § 98.232(c)(21) and (j)(10).
4 Hydrocarbon liquids greater than or equal to 20°API are considered “light crude.”
5 Hydrocarbon liquids less than 20°API are considered “heavy crude.”