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."
40 C.F.R. §Table W-1A to Subpart W of Part 98