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Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 98, Subpt. W, Tbl. W-4A Table W–4A to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors for Underground Natural Gas Storage

Current as of January 02, 2025 | Updated by Findlaw Staff

Underground natural gas storage

Emission factor

(scf/hour/component)

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).

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Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 98, Subpt. W, Tbl. W-4A Table W–4A to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors for Underground Natural Gas Storage - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-pt-40-98-subpt-w-tbl-w-4a/

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