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Table W-6 to Subpart W of Part 98—Default Methane Leaker Emission Factors
1 "Other" equipment type for components in LNG service should be applied for any equipment type other than connectors, pumps, or valves.
2 Valves include control valves, block valves and regulator valves.
3 "Other" equipment type for components in gas service should be applied for any equipment type other than valves, connectors, flanges, open-ended lines, pressure relief valves, and meters and instruments, as specified in §98.232(g)(6) and (7) and §98.232(h)(7) and (8).
4 Excluding customer meters.
Equipment components Emission factor (scf methane/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—LNG Storage and LNG Import and Export Equipment—Storage Components and Terminals Components, LNG Service
Valve 1.19 0.23 1.94
Pump Seal 4.00 0.73 6.54
Connector 0.34 0.11 0.56
Other 1 1.77 0.99 2.9
Leaker Emission Factors—LNG Storage and LNG Import and Export Equipment—Storage Components and Terminals Components, Gas Service
Valve 2 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 and Instrument 19.33 12.39 31.6
Other 3 4.1 2.63 6.70
Leaker Emission Factors—Natural Gas Distribution—Transmission-Distribution Transfer Station4Components, Gas Service
Connector 1.69 2.76
Block Valve 0.557 0.91
Control Valve 9.34 15.3
Pressure Relief Valve 0.27 0.44
Orifice Meter 0.212 0.35
Regulator 0.772 1.26
Open-ended Line 26.131 42.7

[89 FR 42327, May 14, 2024]

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