{"data":{"id":"us/40-cfr-table-w-4-to-subpart-w-of-part-98","jurisdiction":"us","citation":"40 CFR Table W-4 to Subpart W of Part 98","heading":"Table W-4 to Subpart W of Part 98—Default Total Hydrocarbon Leaker Emission Factors","body":"Equipment components Emission factor (scf total hydrocarbon/hour/component)\nIf 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)\nLeaker Emission Factors—Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression—Compressor Components, Gas Service\nValve 1 14.84 9.51 24.2\nConnector 5.59 3.58 9.13\nOpen-Ended Line 17.27 11.07 28.2\nPressure Relief Valve 39.66 25.42 64.8\nMeter 19.33 12.39 31.6\nOther 2 4.1 2.63 6.70\nLeaker Emission Factors—Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression—Non-Compressor Components, Gas Service\nValve 1 6.42 4.12 10.5\nConnector 5.71 3.66 9.3\nOpen-Ended Line 11.27 7.22 18.4\nPressure Relief Valve 2.01 1.29 3.28\nMeter 2.93 1.88 4.79\nOther 2 4.1 2.63 6.70\nLeaker Emission Factors—Underground Natural Gas Storage—Storage Station, Gas Service\nValve 1 14.84 9.51 24.2\nConnector (other) 5.59 3.58 9.13\nOpen-Ended Line 17.27 11.07 28.2\nPressure Relief Valve 39.66 25.42 64.8\nMeter and Instrument 19.33 12.39 31.6\nOther 2 4.1 2.63 6.70\nLeaker Emission Factors—Underground Natural Gas Storage—Storage Wellheads, Gas Service\nValve 1 4.5 3.2 7.35\nConnector (other than flanges) 1.2 0.7 1.96\nFlange 3.8 2.0 6.21\nOpen-Ended Line 2.5 1.7 4.08\nPressure Relief Valve 4.1 2.5 6.70\nOther 2 4.1 2.5 6.70\n1 Valves include control valves, block valves and regulator valves.\n2 Other includes any potential equipment leak emission point in gas service that is not specifically listed in this table, as specified in § 98.232(d)(7) for onshore natural gas processing, § 98.232(e)(8) for onshore natural gas transmission compression, and as specified in § 98.232(f)(6) and (8) for underground natural gas storage.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 98—MANDATORY GREENHOUSE GAS REPORTING","Subpart W—Petroleum and Natural Gas Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"0e45db407d8301f124ec0c83d6bc6932819830e4ea99267c5690762c5cd86277","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-w-3-to-subpart-w-of-part-98","next":"us/40-cfr-table-w-5-to-subpart-w-of-part-98"},"notice":"GroundRules: Original legal text. Not legal advice."}