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Electronic Code of Federal Regulations

e-CFR data is current as of November 8, 2019

Title 40Chapter ISubchapter CPart 98Subpart W → Appendix


Title 40: Protection of Environment
PART 98—MANDATORY GREENHOUSE GAS REPORTING
Subpart W—Petroleum and Natural Gas Systems


Table W-4A to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors for Underground Natural Gas Storage

Table W-4A to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors for Underground Natural Gas Storage

Underground natural gas storageEmission 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
Valve114.849.51
Connector (other)5.593.58
Open-Ended Line17.2711.07
Pressure Relief Valve39.6625.42
Meter and Instrument19.3312.39
Other24.12.63
Leaker Emission Factors—Storage Wellheads, Gas Service
Valve14.53.2
Connector (other than flanges)1.20.7
Flange3.82.0
Open-Ended Line2.51.7
Pressure Relief Valve4.12.5
Other24.12.5

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

2Other 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]

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