{"data":{"id":"us/40-cfr-table-w-1-to-subpart-w-of-part-98","jurisdiction":"us","citation":"40 CFR Table W-1 to Subpart W of Part 98","heading":"Table W-1 to Subpart W of Part 98—Default Whole Gas Population Emission Factors","body":"Industry segment Source type/component Emission factor (scf whole gas/ hour/unit)\nPopulation Emission Factors—Pneumatic Device Vents and Pneumatic Pumps, Gas Service 1\n• Onshore petroleum and natural gas production Continuous Low Bleed Pneumatic Device Vents 2 6.8\n• Onshore petroleum and natural gas gathering and boosting Continuous High Bleed Pneumatic Device Vents 2 21\nIntermittent Bleed Pneumatic Device Vents 2 8.8\nPneumatic Pumps 3 13.3\n• Onshore natural gas processing Continuous Low Bleed Pneumatic Device Vents 2 6.8\n• Onshore natural gas transmission compression Continuous High Bleed Pneumatic Device Vents 2 30\n• Underground natural gas storage Intermittent Bleed Pneumatic Device Vents 2 2.3\n• Natural gas distribution\nPopulation Emission Factors—Major Equipment, Gas Service 1\n• Onshore petroleum and natural gas production Wellhead 8.87\n• Onshore petroleum and natural gas gathering and boosting Separator 9.65\nMeters/Piping 7.04\nCompressor 13.8\nDehydrator 8.09\nHeater 5.22\nStorage Vessel 1.83\nPopulation Emission Factors—Major Equipment, Crude Service\nOnshore petroleum and natural gas production Wellhead 4.13\nSeparator 4.77\nMeters/Piping 12.4\nCompressor 13.8\nDehydrator 8.09\nHeater 3.2\nStorage Vessel 1.91\nPopulation Emission Factors—Gathering Pipelines, by Material Type 4\nOnshore petroleum and natural gas gathering and boosting Protected Steel 0.93\nUnprotected Steel 8.2\nPlastic/Composite 0.28\nCast Iron 8.4\n1 For multi-phase flow that includes gas, use the gas service emission factors.\n2 Emission factor is in units of “scf whole gas/hour/device.”\n3 Emission factor is in units of “scf whole gas/hour/pump.”\n4 Emission factors are in units of “scf whole gas/hour/mile of pipeline.”","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 98—MANDATORY GREENHOUSE GAS REPORTING","Subpart W—Petroleum and Natural Gas Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"fcc3f6254b2e485483540daadcc525cef8a36094ed7e5e5829f935d2c0366876","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-98.238","next":"us/40-cfr-table-w-2-to-subpart-w-of-part-98"},"notice":"GroundRules: Original legal text. Not legal advice."}