40 CFR Table W-7 to Subpart W of Part 98
Default Methane Emission Factors for Natural Gas Distribution
June 9, 2020
Open Table
| Natural gas distribution | Emission factor (scf/hour/ component) |
|---|---|
| Leaker Emission Factors—Transmission-Distribution Transfer Station1Components, 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 station1Components, 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 |
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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