{"data":{"id":"us/10-cfr-431.344","jurisdiction":"us","citation":"10 CFR 431.344","heading":"Test procedure for measuring and determining energy efficiency of compressors.","body":"(a) Scope. This section is a test procedure that is applicable to a compressor that meets the following criteria:\n(1) Is an air compressor;\n(2) Is a rotary compressor;\n(3) Is not a liquid ring compressor;\n(4) Is driven by a brushless electric motor;\n(5) Is a lubricated compressor;\n(6) Has a full-load operating pressure greater than or equal to 75 pounds per square inch gauge (psig) and less than or equal to 200 psig;\n(7) Is not designed and tested to the requirements of the American Petroleum Institute Standard 619, “Rotary-Type Positive-Displacement Compressors for Petroleum, Petrochemical, and Natural Gas Industries;”\n(8) Has full-load actual volume flow rate greater than or equal to 35 cubic feet per minute (cfm), or is distributed in commerce with a compressor motor nominal horsepower greater than or equal to 10 horsepower (hp); and\n(9) Has a full-load actual volume flow rate less than or equal to 1,250 cfm, or is distributed in commerce with a compressor motor nominal horsepower less than or equal to 200 hp.\n(b) Testing and calculations. Determine the applicable full-load package isentropic efficiency (ηisen,FL), part-load package isentropic efficiency (ηisen,PL), package specific power, maximum full-flow operating pressure, full-load operating pressure, full-load actual volume flow rate, and pressure ratio at full-load operating pressure using the test procedure set forth in appendix A of this subpart.","path":["Title 10—Energy","CHAPTER II—DEPARTMENT OF ENERGY","SUBCHAPTER D—ENERGY CONSERVATION","PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT","Subpart T—Compressors"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"9e144aa9a89248bd4a765587b8c2254402a95c80abd1a9f5cdf39ef752d0f3f6","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-431.343","next":"us/10-cfr-431.345"},"notice":"GroundRules: Original legal text. Not legal advice."}