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

Onshore petroleum and natural gas production	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
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

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.”

[77 FR 51494, Aug. 24, 2012]