40 CFR Table W-5 to Subpart W of Part 98: Table W-5 to Subpart W of Part 98—Default Methane Population Emission Factors

Industry segment Source type/component Emission factor (scf methane/hour/ component)

Population Emission Factors—LNG Storage Compressor, Gas Service

LNG storage Vapor Recovery Compressor 1 4.17

LNG import and export equipment

Population Emission Factors—Below Grade Transmission-Distribution Transfer Station Components and Below Grade Metering-Regulating Station 2 Components, Gas Service 3

Natural gas distribution Below Grade T-D Transfer Station 0.30

Below Grade M&R Station 0.30

Population Emission Factors—Distribution Mains, Gas Service 4

Natural gas distribution Unprotected Steel 5.1

Protected Steel 0.57

Plastic 0.17

Cast Iron 6.9

Population Emission Factors—Distribution Services, Gas Service 5

Natural gas distribution Unprotected Steel 0.086

Protected Steel 0.0077

Plastic 0.0016

Copper 0.03

Population Emission Factors—Interconnect, Direct Sale, or Farm Tap Stations 2 3

Onshore natural gas transmission pipeline Transmission Company Interconnect M&R Station 166

Direct Sale or Farm Tap Station 1.3

Population Emission Factors—Transmission Pipelines, Gas Service 4

Onshore natural gas transmission pipeline Unprotected Steel 0.74

Protected Steel 0.041

Plastic 0.061

Cast Iron 27

1 Emission Factor is in units of “scf methane/hour/compressor.”

2 Excluding customer meters.

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

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

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