40 CFR Appendix 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

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.”

[81 FR 86515, Nov. 30, 2016]

The following state regulations pages link to this page.