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Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 98, Subpt. W, Tbl. W-7 Table W–7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution

Current as of January 02, 2025 | Updated by Findlaw Staff

Natural gas distribution

Emission factor (scf/hour/ component)

Leaker Emission Factors—Transmission-Distribution Transfer Station 1 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 station 1 Components, Gas Service 2

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 Service 3

Unprotected Steel

12.58

Protected Steel

0.35

Plastic

1.13

Cast Iron

27.25

Population Emission Factors—Distribution Services, Gas Service 4

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.”

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Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 98, Subpt. W, Tbl. W-7 Table W–7 to Subpart W of Part 98—Default Methane Emission Factors for Natural Gas Distribution - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-pt-40-98-subpt-w-tbl-w-7/

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