Table W-1 to Subpart W of Part 98—Default Whole Gas Population Emission Factors

Industry segment	Source type/component	Emission factor (scf whole gas/ hour/unit)	Population Emission Factors—Pneumatic Device Vents and Pneumatic Pumps, Gas Service 1			• Onshore petroleum and natural gas production	Continuous Low Bleed Pneumatic Device Vents 2	6.8	• Onshore petroleum and natural gas gathering and boosting	Continuous High Bleed Pneumatic Device Vents 2	21		Intermittent Bleed Pneumatic Device Vents 2	8.8		Pneumatic Pumps 3	13.3	• Onshore natural gas processing	Continuous Low Bleed Pneumatic Device Vents 2	6.8	• Onshore natural gas transmission compression	Continuous High Bleed Pneumatic Device Vents 2	30	• Underground natural gas storage	Intermittent Bleed Pneumatic Device Vents 2	2.3	• Natural gas distribution			Population Emission Factors—Major Equipment, Gas Service 1			• Onshore petroleum and natural gas production	Wellhead	8.87	• Onshore petroleum and natural gas gathering and boosting	Separator	9.65		Meters/Piping	7.04		Compressor	13.8		Dehydrator	8.09		Heater	5.22		Storage Vessel	1.83	Population Emission Factors—Major Equipment, Crude Service			Onshore petroleum and natural gas production	Wellhead	4.13		Separator	4.77		Meters/Piping	12.4		Compressor	13.8		Dehydrator	8.09		Heater	3.2		Storage Vessel	1.91	Population Emission Factors—Gathering Pipelines, by Material Type 4			Onshore petroleum and natural gas gathering and boosting	Protected Steel	0.93		Unprotected Steel	8.2		Plastic/Composite	0.28		Cast Iron	8.4

1 For multi-phase flow that includes gas, use the gas service emission factors.

2 Emission factor is in units of “scf whole gas/hour/device.”

3 Emission factor is in units of “scf whole gas/hour/pump.”

4 Emission factors are in units of “scf whole gas/hour/mile of pipeline.”

[89 FR 42323, May 14, 2024]