Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 98Subpart WAppendix - 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
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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
Link to an amendment published at 89 FR 42323, May 14, 2024.
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
Valve4.93.5
Flange4.12.2
Connector (other)1.30.8
Open-Ended Line 22.81.9
Pressure Relief Valve4.52.8
Pump Seal3.71.4
Other 34.52.8
Leaker Emission Factors—All Components, Light Crude Service 1
Valve3.22.2
Flange2.71.4
Connector (other)1.00.6
Open-Ended Line1.61.1
Pump3.72.6
Agitator Seal3.72.6
Other 33.12.0
Leaker Emission Factors—All Components, Heavy Crude Service 1
Valve3.22.2
Flange2.71.4
Connector (other)1.00.6
Open-Ended Line1.61.1
Pump3.72.6
Agitator Seal3.72.6
Other 33.12.0

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]
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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