{"data":{"id":"us/40-cfr-60.631","jurisdiction":"us","citation":"40 CFR 60.631","heading":"Definitions.","body":"As used in this subpart, all terms not defined herein shall have the meaning given them in the Act, in subpart A or subpart VV of part 60; and the following terms shall have the specific meanings given them.\nAlaskan North Slope means the approximately 69,000 square-mile area extending from the Brooks Range to the Arctic Ocean.\nEquipment means each pump, pressure relief device, open-ended valve or line, valve, compressor, and flange or other connector that is in VOC service or in wet gas service, and any device or system required by this subpart.\nField gas means feedstock gas entering the natural gas processing plant.\nIn light liquid service means that the piece of equipment contains a liquid that meets the conditions specified in § 60.485(e) or § 60.633(h)(2).\nIn wet gas service means that a piece of equipment contains or contacts the field gas before the extraction step in the process.\nNatural gas liquids means the hydrocarbons, such as ethane, propane, butane, and pentane, that are extracted from field gas.\nNatural gas processing plant (gas plant) means any processing site engaged in the extraction of natural gas liquids from field gas, fractionation of mixed natural gas liquids to natural gas products, or both.\nNonfractionating plant means any gas plant that does not fractionate mixed natural gas liquids into natural gas products.\nOnshore means all facilities except those that are located in the territorial seas or on the outer continental shelf.\nProcess unit means equipment assembled for the extraction of natural gas liquids from field gas, the fractionation of the liquids into natural gas products, or other operations associated with the processing of natural gas products. A process unit can operate independently if supplied with sufficient feed or raw materials and sufficient storage facilities for the products.\nReciprocating compressor means a piece of equipment that increases the pressure of a process gas by positive displacement, employing linear movement of the driveshaft.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 60—STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES","Subpart KKK—Standards of Performance for Equipment Leaks of VOC From Onshore Natural Gas Processing Plants for Which Construction, Reconstruction, or Modification Commenced After January 20, 1984, and on or Before August 23, 2011"],"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":"1091fca75fa28ce06f4535c0fc7d1ddff9285df58691c123da473b2aa4e66527","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-60.630","next":"us/40-cfr-60.632"},"notice":"GroundRules: Original legal text. Not legal advice."}