40 CFR Table W-1E to Subpart W of Part 98
Default Whole Gas Leaker Emission Factors for Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting
June 9, 2020
Open Table
| Equipment components | Emission factor (scf/hour/component) |
|
|---|---|---|
| If you survey using any of the methods in §98.234(a)(1) through (6) |
If you survey using Method 21 as specified in §98.234(a)(7) |
|
| Leaker Emission Factors—All Components, Gas Service1 | ||
| Valve | 4.9 | 3.5 |
| Flange | 4.1 | 2.2 |
| Connector (other) | 1.3 | 0.8 |
| Open-Ended Line2 | 2.8 | 1.9 |
| Pressure Relief Valve | 4.5 | 2.8 |
| Pump Seal | 3.7 | 1.4 |
| Other3 | 4.5 | 2.8 |
| Leaker Emission Factors—All Components, Light Crude Service1 | ||
| Valve | 3.2 | 2.2 |
| Flange | 2.7 | 1.4 |
| Connector (other) | 1.0 | 0.6 |
| Open-Ended Line | 1.6 | 1.1 |
| Pump | 3.7 | 2.6 |
| Agitator Seal | 3.7 | 2.6 |
| Other3 | 3.1 | 2.0 |
| Leaker Emission Factors—All Components, Heavy Crude Service1 | ||
| Valve | 3.2 | 2.2 |
| Flange | 2.7 | 1.4 |
| Connector (other) | 1.0 | 0.6 |
| Open-Ended Line | 1.6 | 1.1 |
| Pump | 3.7 | 2.6 |
| Agitator Seal | 3.7 | 2.6 |
| Other3 | 3.1 | 2.0 |
1For multi-phase flow that includes gas, use the gas service emission factors.
2The open-ended lines component type includes blowdown valve and isolation valve leaks emitted through the blowdown vent stack for centrifugal and reciprocating compressors.
3“Others” category includes any equipment leak emission point not specifically listed in this table, as specified in §98.232(c)(21) and (j)(10).
4Hydrocarbon liquids greater than or equal to 20°API are considered “light crude.”
5Hydrocarbon liquids less than 20°API are considered “heavy crude.”
[81 FR 86515, Nov. 30, 2016]
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