40 C.F.R. § Table W-2 to Subpart W of Part 98

Current through October 31, 2024
Appendix Table W-2 to Subpart W of Part 98 - [Effective 1/1/2025] Default Whole Gas Leaker Emission Factors

Equipment componentsEmission factor (scf whole gas/hour/component)
If you survey using Method 21 as specified in § 98.234(a)(2)(i) If you survey using Method 21 as specified in § 98.234(a)(2)(ii) If you survey using any of the methods in § 98.234(a)(1), (3), or (5)
Leaker Emission Factors-Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting-All Components, Gas Service
Valve9.65.516
Flange6.94.011
Connector (other)4.92.87.9
Open-Ended Line 16.33.610
Pressure Relief Valve7.84.513
Pump Seal148.323
Other 29.15.315
Leaker Emission Factors-Onshore Petroleum and Natural Gas Production-All Components, Oil Service
Valve5.63.39.2
Flange2.71.64.4
Connector (other)5.63.29.1
Open-Ended Line1.60.932.6
Pump 33.72.26.0
Other 22.21.02.9

1 The open-ended lines component type includes blowdown valve and isolation valve leaks emitted through the blowdown vent stack for centrifugal and reciprocating compressors when using the population emission factor approach as specified in § 98.233(o)(10)(iv) or (p)(10)(iv) .

2 "Others" category includes any equipment leak emission point not specifically listed in this table, as specified in § 98.232(c)(21) and (j)(10) .

3 The pumps component type in oil service includes agitator seals.

40 C.F.R. §Table W-2 to Subpart W of Part 98

76 FR 80592 , Dec. 23, 2011
89 FR 42324 , 1/1/2025