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Table W-2 to Subpart W of Part 98—Default Whole Gas Leaker Emission Factors
1 The open-ended lines component type includes blowdown valve and isolation valve leaks emitted through the blowdown vent stack for centrifugal and reciprocating compressors when using the population emission factor approach as specified in §98.233(o)(10)(iv) or (p)(10)(iv).
2 "Others" category includes any equipment leak emission point not specifically listed in this table, as specified in §98.232(c)(21) and (j)(10).
3 The pumps component type in oil service includes agitator seals.
Equipment components Emission factor (scf whole gas/hour/component)
If you survey using Method 21 as specified in §98.234(a)(2)(i) If you survey using Method 21 as specified in §98.234(a)(2)(ii) If you survey using any of the methods in §98.234(a)(1), (3), or (5)
Leaker Emission Factors—Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting—All Components, Gas Service
Valve 9.6 5.5 16
Flange 6.9 4.0 11
Connector (other) 4.9 2.8 7.9
Open-Ended Line 1 6.3 3.6 10
Pressure Relief Valve 7.8 4.5 13
Pump Seal 14 8.3 23
Other 2 9.1 5.3 15
Leaker Emission Factors—Onshore Petroleum and Natural Gas Production—All Components, Oil Service
Valve 5.6 3.3 9.2
Flange 2.7 1.6 4.4
Connector (other) 5.6 3.2 9.1
Open-Ended Line 1.6 0.93 2.6
Pump 3 3.7 2.2 6.0
Other 2 2.2 1.0 2.9

[75 FR 74514 Nov. 30, 2010; 76 FR 80592, Dec. 23, 2011]

['Air Programs']
['Greenhouse Gases']
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