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

Default Whole Gas Population Emission Factors

  1. CFR
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  3. Title 40
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  5. Chapter I
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  7. Part 98
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  9. Subpart W
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  11. Appendix Table W-1 to Subpart W of Part 98
CorpusDaily eCFR
Displayed edition2026-04-15
Last updated2026-04-15

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

Industry segmentSource type/componentEmission factor

(scf whole gas/

hour/unit)
Population Emission Factors—Pneumatic Device Vents and Pneumatic Pumps, Gas Service1
• Onshore petroleum and natural gas productionContinuous Low Bleed Pneumatic Device Vents 26.8
• Onshore petroleum and natural gas gathering and boostingContinuous High Bleed Pneumatic Device Vents 221
Intermittent Bleed Pneumatic Device Vents 28.8
Pneumatic Pumps 313.3
• Onshore natural gas processingContinuous Low Bleed Pneumatic Device Vents 26.8
• Onshore natural gas transmission compressionContinuous High Bleed Pneumatic Device Vents 230
• Underground natural gas storageIntermittent Bleed Pneumatic Device Vents 22.3
• Natural gas distribution
Population Emission Factors—Major Equipment, Gas Service1
• Onshore petroleum and natural gas productionWellhead8.87
• Onshore petroleum and natural gas gathering and boostingSeparator9.65
Meters/Piping7.04
Compressor13.8
Dehydrator8.09
Heater5.22
Storage Vessel1.83
Population Emission Factors—Major Equipment, Crude Service
Onshore petroleum and natural gas productionWellhead4.13
Separator4.77
Meters/Piping12.4
Compressor13.8
Dehydrator8.09
Heater3.2
Storage Vessel1.91
Population Emission Factors—Gathering Pipelines, by Material Type4
Onshore petroleum and natural gas gathering and boostingProtected Steel0.93
Unprotected Steel8.2
Plastic/Composite0.28
Cast Iron8.4
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]