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. [89 FR 42327, May 14, 2024]