40 C.F.R. § 98 app Table W-7 to Subpart W of Part 98
Current through May 31, 2024
| 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 [GREATER THAN]300 psig | 1.30 |
| Below Grade M&R Station, Inlet Pressure 100 to 300 psig | 0.20 |
| Below Grade M&R Station, Inlet Pressure [LESS THAN]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."
40 C.F.R. 98 app Table W-7 to Subpart W of Part 98