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Electronic Code of Federal Regulations

e-CFR data is current as of November 7, 2019

Title 40Chapter ISubchapter CPart 98Subpart W → Appendix


Title 40: Protection of Environment
PART 98—MANDATORY GREENHOUSE GAS REPORTING
Subpart W—Petroleum and Natural Gas Systems


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 componentsEmission 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 Service1
Valve4.93.5
Flange4.12.2
Connector (other)1.30.8
Open-Ended Line22.81.9
Pressure Relief Valve4.52.8
Pump Seal3.71.4
Other34.52.8
Leaker Emission Factors—All Components, Light Crude Service1
Valve3.22.2
Flange2.71.4
Connector (other)1.00.6
Open-Ended Line1.61.1
Pump3.72.6
Agitator Seal3.72.6
Other33.12.0
Leaker Emission Factors—All Components, Heavy Crude Service1
Valve3.22.2
Flange2.71.4
Connector (other)1.00.6
Open-Ended Line1.61.1
Pump3.72.6
Agitator Seal3.72.6
Other33.12.0

1For multi-phase flow that includes gas, use the gas service emission factors.

2The 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).

4Hydrocarbon liquids greater than or equal to 20°API are considered “light crude.”

5Hydrocarbon liquids less than 20°API are considered “heavy crude.”

[81 FR 86515, Nov. 30, 2016]

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