Regulations last checked for updates: Oct 17, 2024

Title 40 - Protection of Environment last revised: Oct 15, 2024
All TitlesTitle 40Chapter IPart 98Subpart WAppendix - Table W-7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution
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Appendix - Table W-7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution
Link to an amendment published at 89 FR 42327, May 14, 2024.
Natural gas distribution Emission factor (scf/hour/
component)
Leaker Emission Factors—Transmission-Distribution Transfer Station 1 Components, Gas Service
Connector1.69
Block Valve0.557
Control Valve9.34
Pressure Relief Valve0.27
Orifice Meter0.212
Regulator0.772
Open-ended Line26.131
Population Emission Factors—Below Grade Metering-Regulating station 1 Components, Gas Service 2
Below Grade M&R Station, Inlet Pressure >300 psig1.30
Below Grade M&R Station, Inlet Pressure 100 to 300 psig0.20
Below Grade M&R Station, Inlet Pressure <100 psig0.10
Population Emission Factors—Distribution Mains, Gas Service 3
Unprotected Steel12.58
Protected Steel0.35
Plastic1.13
Cast Iron27.25
Population Emission Factors—Distribution Services, Gas Service 4
Unprotected Steel0.19
Protected Steel0.02
Plastic0.001
Copper0.03

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.”

[76 FR 80594, Dec. 23, 2011]
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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