---
kind: "section"
citation: "10 C.F.R. § 431.344"
title: "10"
number: "431.344"
heading: "Test procedure for measuring and determining energy efficiency of compressors."
url: "https://uscodex.org/cfr/10/431.344"
---

# §431.344. Test procedure for measuring and determining energy efficiency of compressors.

- (a) **Scope.** This section is a test procedure that is applicable to a compressor that meets the following criteria:
  - (1) Is an air compressor;
  - (2) Is a rotary compressor;
  - (3) Is not a liquid ring compressor;
  - (4) Is driven by a brushless electric motor;
  - (5) Is a lubricated compressor;
  - (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;
  - (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;”
  - (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
  - (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.
- (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.

## Notes

### Amendments

[82 FR 1102, Jan. 4, 2017]

### Source

Source: 81 FR 79998, Nov. 15, 2016, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

### Source

Source: 64 FR 54141, Oct. 5, 1999, unless otherwise noted.

### Amendments

[82 FR 1102, Jan. 4, 2017]