40 CFR Table W-1 to Subpart W of Part 98: 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.”