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.”

[89 FR 42326, May 14, 2024]