40 C.F.R. § Table W-1 to Subpart W of Part 98

Current through May 31, 2024

Appendix Table W-1 to Subpart W of Part 98 - [Effective 1/1/2025] 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 Service1
. 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 Service1
. 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 Type4
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."

40 C.F.R. §Table W-1 to Subpart W of Part 98

89 FR 42323, 1/1/2025