40 CFR Table W-6 to Subpart W of Part 98: Table W-6 to Subpart W of Part 98—Default Methane Leaker Emission Factors

Equipment components Emission factor (scf methane/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—LNG Storage and LNG Import and Export Equipment—Storage Components and Terminals Components, LNG Service

Valve 1.19 0.23 1.94

Pump Seal 4.00 0.73 6.54

Connector 0.34 0.11 0.56

Other 1 1.77 0.99 2.9

Leaker Emission Factors—LNG Storage and LNG Import and Export Equipment—Storage Components and Terminals Components, Gas Service

Valve 2 14.84 9.51 24.2

Connector 5.59 3.58 9.13

Open-Ended Line 17.27 11.07 28.2

Pressure Relief Valve 39.66 25.42 64.8

Meter and Instrument 19.33 12.39 31.6

Other 3 4.1 2.63 6.70

Leaker Emission Factors—Natural Gas Distribution—Transmission-Distribution Transfer Station 4 Components, Gas Service

Connector 1.69 2.76

Block Valve 0.557 0.91

Control Valve 9.34 15.3

Pressure Relief Valve 0.27 0.44

Orifice Meter 0.212 0.35

Regulator 0.772 1.26

Open-ended Line 26.131 42.7

1 “Other” equipment type for components in LNG service should be applied for any equipment type other than connectors, pumps, or valves.

2 Valves include control valves, block valves and regulator valves.

3 “Other” equipment type for components in gas service should be applied for any equipment type other than valves, connectors, flanges, open-ended lines, pressure relief valves, and meters and instruments, as specified in § 98.232(g)(6) and (7) and § 98.232(h)(7) and (8).

4 Excluding customer meters.