40 CFR Appendix Table W-3A to Subpart W of Part 98 - Default Total Hydrocarbon Leaker Emission Factors for Onshore Natural Gas Transmission Compression

Table W-3A to Subpart W of Part 98 - Default Total Hydrocarbon Leaker Emission Factors for Onshore Natural Gas Transmission Compression
Onshore natural gas transmission compression 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 - Compressor Components, Gas Service
Valve 1 14.84 9.51
Connector 5.59 3.58
Open-Ended Line 17.27 11.07
Pressure Relief Valve 39.66 25.42
Meter or Instrument 19.33 12.39
Other 2 4.1 2.63
Leaker Emission Factors - Non-Compressor Components, Gas Service
Valve 1 6.42 4.12
Connector 5.71 3.66
Open-Ended Line 11.27 7.22
Pressure Relief Valve 2.01 1.29
Meter or Instrument 2.93 1.88
Other 2 4.1 2.63

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(e)(8).

[81 FR 86516, Nov. 30, 2016]

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