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Table W-7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution
Natural gas distribution Emission Factor (scf/hour/component)
Leaker Emission Factors—Transmission-Distribution Transfer Station1 Components, Gas Service
Connector 1.69
Block Valve 0.557
Control Valve 9.34
Pressure Relief Valve 0.27
Orifice Meter 0.212
Regulator 0.772
Open-ended Line 26.131
Population Emission Factors—Below Grade Metering-Regulating station1 Components, Gas Service2
Below Grade M&R Station, Inlet Pressure >300 psig 1.30
Below Grade M&R Station, Inlet Pressure 100 to 300 psig 0.20
Below Grade M&R Station, Inlet Pressure < 100 psig 0.10
Population Emission Factors—Distribution Mains, Gas Service3
Unprotected Steel 12.58
Protected Steel 0.35
Plastic 1.13
Cast Iron 27.25
Population Emission Factors—Distribution Services, Gas Service4
Unprotected Steel 0.19
Protected Steel 0.02
Plastic 0.001
Copper 0.03
1 Excluding customer meters.
2 Emission Factor is in units of “scf/hour/station.”
3 Emission Factor is in units of “scf/hour/mile.”
4 Emission Factor is in units of “scf/hour/number of services.”

[75 FR 74514, Nov. 30, 2010; 76 FR 80594, Dec. 23, 2011]

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