40 CFR Appendix Table W-1A to Subpart W of Part 98 - Default Whole Gas Emission Factors for Onshore Petroleum and Natural Gas Production Facilities and Onshore Petroleum and Natural Gas Gathering and Boosting Facilities

Table W-1A to Subpart W of Part 98 - Default Whole Gas Emission Factors for Onshore Petroleum and Natural Gas Production Facilities and Onshore Petroleum and Natural Gas Gathering and Boosting Facilities

Table W-1A to Subpart W of Part 98 - Default Whole Gas Emission Factors for Onshore Petroleum and Natural Gas Production Facilities and Onshore Petroleum and Natural Gas Gathering and Boosting Facilities

Onshore petroleum and natural gas production and Onshore petroleum and natural gas gathering and boosting Emission factor
(scf/hour/component)
Eastern U.S.
Population Emission Factors - All Components, Gas Service 1
Valve 0.027
Connector 0.003
Open-ended Line 0.061
Pressure Relief Valve 0.040
Low Continuous Bleed Pneumatic Device Vents 2 1.39
High Continuous Bleed Pneumatic Device Vents 2 37.3
Intermittent Bleed Pneumatic Device Vents 2 13.5
Pneumatic Pumps 3 13.3
Population Emission Factors - All Components, Light Crude Service 4
Valve 0.05
Flange 0.003
Connector 0.007
Open-ended Line 0.05
Pump 0.01
Other 5 0.30
Population Emission Factors - All Components, Heavy Crude Service 6
Valve 0.0005
Flange 0.0009
Connector (other) 0.0003
Open-ended Line 0.006
Other 5 0.003
Population Emission Factors - Gathering Pipelines, by Material Type 7
Protected Steel 0.47
Unprotected Steel 16.59
Plastic/Composite 2.50
Cast Iron 27.60
Western U.S.
Population Emission Factors - All Components, Gas Service 1
Valve 0.121
Connector 0.017
Open-ended Line 0.031
Pressure Relief Valve 0.193
Low Continuous Bleed Pneumatic Device Vents 2 1.39
High Continuous Bleed Pneumatic Device Vents 2 37.3
Intermittent Bleed Pneumatic Device Vents 2 13.5
Pneumatic Pumps 3 13.3
Population Emission Factors - All Components, Light Crude Service 4
Valve 0.05
Flange 0.003
Connector (other) 0.007
Open-ended Line 0.05
Pump 0.01
Other 5 0.30
Population Emission Factors - All Components, Heavy Crude Service 6
Valve 0.0005
Flange 0.0009
Connector (other) 0.0003
Open-ended Line 0.006
Other 5 0.003
Population Emission Factors - Gathering Pipelines by Material Type 7
Protected Steel 0.47
Unprotected Steel 16.59
Plastic/Composite 2.50
Cast Iron 27.60

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

2 Emission Factor is in units of “scf/hour/device.”

3 Emission Factor is in units of “scf/hour/pump.”

4 Hydrocarbon liquids greater than or equal to 20°API are considered “light crude.”

5 “Others” category includes instruments, loading arms, pressure relief valves, stuffing boxes, compressor seals, dump lever arms, and vents.

6 Hydrocarbon liquids less than 20°API are considered “heavy crude.”

7 Emission factors are in units of “scf/hour/mile of pipeline.”

[80 FR 64297, Oct. 22, 2015]