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Electronic Code of Federal Regulations

e-CFR data is current as of December 12, 2019

Title 40Chapter ISubchapter CPart 98Subpart W → Appendix


Title 40: Protection of Environment
PART 98—MANDATORY GREENHOUSE GAS REPORTING
Subpart W—Petroleum and Natural Gas Systems


Table W-7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution

Natural gas distributionEmission factor (scf/hour/
component)
Leaker Emission Factors—Transmission-Distribution Transfer Station1 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 station1 Components, Gas Service2
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 Service3
Unprotected Steel12.58
Protected Steel0.35
Plastic1.13
Cast Iron27.25
Population Emission Factors—Distribution Services, Gas Service4
Unprotected Steel0.19
Protected Steel0.02
Plastic0.001
Copper0.03

1Excluding customer meters.

2Emission Factor is in units of “scf/hour/station.”

3Emission Factor is in units of “scf/hour/mile.”

4Emission Factor is in units of “scf/hour/number of services.”

[76 FR 80594, Dec. 23, 2011]

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