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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)
1For multi-phase flow that includes gas, use the gas service emissions factors.
2Emission Factor is in units of “scf/hour/device.”
3Emission Factor is in units of “scf/hour/pump.”
4Hydrocarbon 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.
6Hydrocarbon liquids less than 20°API are considered “heavy crude.”
7Emission factors are in units of “scf/hour/mile of pipeline.”
Eastern U.S.
Population Emission Factors—All Components, Gas Service1
Valve 0.027
Connector 0.003
Open-ended Line 0.061
Pressure Relief Valve 0.040
Low Continuous Bleed Pneumatic Device Vents2 1.39
High Continuous Bleed Pneumatic Device Vents2 37.3
Intermittent Bleed Pneumatic Device Vents2 13.5
Pneumatic Pumps3 13.3
Population Emission Factors—All Components, Light Crude Service4
Valve 0.05
Flange 0.003
Connector 0.007
Open-ended Line 0.05
Pump 0.01
Other5 0.30
Population Emission Factors—All Components, Heavy Crude Service6
Valve 0.0005
Flange 0.0009
Connector (other) 0.0003
Open-ended Line 0.006
Other5 0.003
Population Emission Factors—Gathering Pipelines, by Material Type7
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 Service1
Valve 0.121
Connector 0.017
Open-ended Line 0.031
Pressure Relief Valve 0.193
Low Continuous Bleed Pneumatic Device Vents2 1.39
High Continuous Bleed Pneumatic Device Vents2 37.3
Intermittent Bleed Pneumatic Device Vents2 13.5
Pneumatic Pumps3 13.3
Population Emission Factors—All Components, Light Crude Service4
Valve 0.05
Flange 0.003
Connector (other) 0.007
Open-ended Line 0.05
Pump 0.01
Other5 0.30
Population Emission Factors—All Components, Heavy Crude Service6
Valve 0.0005
Flange 0.0009
Connector (other) 0.0003
Open-ended Line 0.006
Other5 0.003
Population Emission Factors—Gathering Pipelines by Material Type7
Protected Steel 0.47
Unprotected Steel 16.59
Plastic/Composite 2.50
Cast Iron 27.60

[75 FR 74512, Nov. 30, 2010; 76 FR 80591, Dec. 23, 2011; 77 FR 51495, Aug. 24, 2012; 80 FR 64297, Oct. 22, 2015]

['Air Programs']
['Greenhouse Gases']
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