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 Code of Federal Regulations (Last Updated: July 5, 2024)
 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

  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  

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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

    Cross Reference
    Link to an amendment published at 89 FR 42323, May 14, 2024.

    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 Service1
    Valve0.027
    Connector0.003
    Open-ended Line0.061
    Pressure Relief Valve0.040
    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
    Valve0.05
    Flange0.003
    Connector0.007
    Open-ended Line0.05
    Pump0.01
    Other5 0.30
    Population Emission Factors—All Components, Heavy Crude Service6
    Valve0.0005
    Flange0.0009
    Connector (other)0.0003
    Open-ended Line0.006
    Other5 0.003
    Population Emission Factors—Gathering Pipelines, by Material Type7
    Protected Steel0.47
    Unprotected Steel16.59
    Plastic/Composite2.50
    Cast Iron27.60
    Western U.S.
    Population Emission Factors—All Components, Gas Service1
    Valve0.121
    Connector0.017
    Open-ended Line0.031
    Pressure Relief Valve0.193
    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
    Valve0.05
    Flange0.003
    Connector (other)0.007
    Open-ended Line0.05
    Pump0.01
    Other5 0.30
    Population Emission Factors—All Components, Heavy Crude Service6
    Valve0.0005
    Flange0.0009
    Connector (other)0.0003
    Open-ended Line0.006
    Other5 0.003
    Population Emission Factors—Gathering Pipelines by Material Type7
    Protected Steel0.47
    Unprotected Steel16.59
    Plastic/Composite2.50
    Cast Iron27.60

    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]