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

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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)
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."
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 Station²Components, Gas Service³
Natural gas distribution	Below Grade T-D Transfer Station	0.30
	Below Grade M&R Station	0.30
Population Emission Factors—Distribution Mains, Gas Service⁴
Natural gas distribution	Unprotected Steel	5.1
	Protected Steel	0.57
	Plastic	0.17
	Cast Iron	6.9
Population Emission Factors—Distribution Services, Gas Service⁵
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 Stations²³
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 Service⁴
Onshore natural gas transmission pipeline	Unprotected Steel	0.74
	Protected Steel	0.041
	Plastic	0.061
	Cast Iron	27

[89 FR 42326, May 14, 2024]

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