Code of Federal Regulations > Title 40 > Chapter I > Part 98 > Subpart W

Regulations last checked for updates: Oct 17, 2024

Title 40 - Protection of Environment last revised: Oct 15, 2024

Appendix -

Link to an amendment published at 89 FR 42325, May 14, 2024.

Underground natural gas storage	Emission factor (scf/hour/component)
Underground natural gas storage	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—Storage Station, Gas Service
Valve ¹	14.84	9.51
Connector (other)	5.59	3.58
Open-Ended Line	17.27	11.07
Pressure Relief Valve	39.66	25.42
Meter and Instrument	19.33	12.39
Other ²	4.1	2.63
Leaker Emission Factors—Storage Wellheads, Gas Service
Valve ¹	4.5	3.2
Connector (other than flanges)	1.2	0.7
Flange	3.8	2.0
Open-Ended Line	2.5	1.7
Pressure Relief Valve	4.1	2.5
Other ²	4.1	2.5

¹ Valves include control valves, block valves and regulator valves.

² Other includes any potential equipment leak emission point in gas service that is not specifically listed in this table, as specified in § 98.232(f)(6) and (8).

[81 FR 86517, Nov. 30, 2016]

authority: 42 U.S.C. 7401-7671q.

source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.