Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 98Subpart WAppendix - Table W-4B to Subpart W of Part 98—Default Total Hydrocarbon Population Emission Factors for Underground Natural Gas Storage
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Appendix - Table W-4B to Subpart W of Part 98—Default Total Hydrocarbon Population Emission Factors for Underground Natural Gas Storage
Link to an amendment published at 89 FR 42325, May 14, 2024.

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

Underground natural gas storage Emission factor
(scf/hour/component)
Population Emission Factors—Storage Wellheads, Gas Service
Connector0.01
Valve0.1
Pressure Relief Valve0.17
Open-Ended Line0.03
Population Emission Factors—Other Components, Gas Service
Low Continuous Bleed Pneumatic Device Vents 11.37
High Continuous Bleed Pneumatic Device Vents 118.20
Intermittent Bleed Pneumatic Device Vents 12.35

1 Emission Factor is in units of “scf/hour/device.”

[81 FR 86517, Nov. 30, 2016]
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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