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Electronic Code of Federal Regulations

e-CFR data is current as of November 14, 2019

Title 40Chapter ISubchapter CPart 98Subpart W → Appendix


Title 40: Protection of Environment
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

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 boostingEmission 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 Vents21.39
High Continuous Bleed Pneumatic Device Vents237.3
Intermittent Bleed Pneumatic Device Vents213.5
Pneumatic Pumps313.3
Population Emission Factors—All Components, Light Crude Service4
Valve0.05
Flange0.003
Connector0.007
Open-ended Line0.05
Pump0.01
Other50.30
Population Emission Factors—All Components, Heavy Crude Service6
Valve0.0005
Flange0.0009
Connector (other)0.0003
Open-ended Line0.006
Other50.003
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 Vents21.39
High Continuous Bleed Pneumatic Device Vents237.3
Intermittent Bleed Pneumatic Device Vents213.5
Pneumatic Pumps313.3
Population Emission Factors—All Components, Light Crude Service4
Valve0.05
Flange0.003
Connector (other)0.007
Open-ended Line0.05
Pump0.01
Other50.30
Population Emission Factors—All Components, Heavy Crude Service6
Valve0.0005
Flange0.0009
Connector (other)0.0003
Open-ended Line0.006
Other50.003
Population Emission Factors—Gathering Pipelines by Material Type7
Protected Steel0.47
Unprotected Steel16.59
Plastic/Composite2.50
Cast Iron27.60

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.”

[80 FR 64297, Oct. 22, 2015]

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