40 CFR Table W-2 to Subpart W of Part 98: Table W-2 to Subpart W of Part 98—Default Whole Gas Leaker Emission Factors

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

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.