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

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
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

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]