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Table W-4A to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors for Underground Natural Gas Storage
Underground natural gas storage 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)
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(f)(6) and (8).
Leaker Emission Factors—Storage Station, Gas Service
Valve 1 14.84 9.51
Connector (other) 5.59 3.58
Open-Ended Line 17.27 11.07
Pressure Relief Valve 39.66 25.42
Meter and Instrument 19.33 12.39
Other 2 4.1 2.63
Leaker Emission Factors—Storage Wellheads, Gas Service
Valve 1 4.5 3.2
Connector (other than flanges) 1.2 0.7
Flange 3.8 2.0
Open-Ended Line 2.5 1.7
Pressure Relief Valve 4.1 2.5
Other 2 4.1 2.5

[81 FR 86517, Nov. 30, 2016]

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