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Table W-4 to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors
1 Valves include control valves, block valves and regulator valves.
2 Other includes any potential equipment leak emission point in gas service that is not specifically listed in this table, as specified in §98.232(d)(7) for onshore natural gas processing, §98.232(e)(8) for onshore natural gas transmission compression, and as specified in §98.232(f)(6) and (8) for underground natural gas storage.
Equipment components Emission factor (scf total hydrocarbon/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 Natural Gas Processing, Onshore Natural Gas Transmission Compression—Compressor Components, Gas Service
Valve 1 14.84 9.51 24.2
Connector 5.59 3.58 9.13
Open-Ended Line 17.27 11.07 28.2
Pressure Relief Valve 39.66 25.42 64.8
Meter 19.33 12.39 31.6
Other 2 4.1 2.63 6.70
Leaker Emission Factors—Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression—Non-Compressor Components, Gas Service
Valve 1 6.42 4.12 10.5
Connector 5.71 3.66 9.3
Open-Ended Line 11.27 7.22 18.4
Pressure Relief Valve 2.01 1.29 3.28
Meter 2.93 1.88 4.79
Other 2 4.1 2.63 6.70
Leaker Emission Factors—Underground Natural Gas Storage—Storage Station, Gas Service
Valve 1 14.84 9.51 24.2
Connector (other) 5.59 3.58 9.13
Open-Ended Line 17.27 11.07 28.2
Pressure Relief Valve 39.66 25.42 64.8
Meter and Instrument 19.33 12.39 31.6
Other 2 4.1 2.63 6.70
Leaker Emission Factors—Underground Natural Gas Storage—Storage Wellheads, Gas Service
Valve 1 4.5 3.2 7.35
Connector (other than flanges) 1.2 0.7 1.96
Flange 3.8 2.0 6.21
Open-Ended Line 2.5 1.7 4.08
Pressure Relief Valve 4.1 2.5 6.70
Other 2 4.1 2.5 6.70

89 FR 42325, May 14, 2024]

['Air Programs']
['Greenhouse Gases']
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