---
kind: "section"
citation: "10 C.F.R. § 431.464"
title: "10"
number: "431.464"
heading: "Test procedure for the measurement of energy efficiency, energy consumption, and other performance factors of pumps."
url: "https://uscodex.org/cfr/10/431.464"
---

# §431.464. Test procedure for the measurement of energy efficiency, energy consumption, and other performance factors of pumps.

- (a) **General pumps—**
  - (1) **Scope.** This [paragraph (a)](#a) provides the test procedures for determining the constant and variable load pump energy index for:
    - (i) The following categories of clean water pumps that have the characteristics listed in [paragraph (a)(1)(iii)](#a-1-iii) of this section.
      - (A) End suction close-coupled (ESCC);
      - (B) End suction frame mounted/own bearings (ESFM);
      - (C) In-line (IL);
      - (D) Radially split, multi-stage, vertical, in-line casing diffuser (RSV); and
      - (E) **Submersible turbine (ST) pumps.**
    - (ii) The additional following categories of clean water pumps that have the characteristics listed in [paragraph (a)(1)(iii)](#a-1-iii) of this section:
      - (A) Radially-split, multi-stage, horizontal, end-suction diffuser casing (RSHES);
      - (B) Radially-split, multi-stage, horizontal, in-line diffuser casing (RSHIL);
      - (C) Small vertical in-line (SVIL); and
      - (D) **Vertical Turbine (VT).**
    - (iii) **Pump characteristics—**
      - (A) Flow rate of 25 gpm or greater at BEP and full impeller diameter;
      - (B) Maximum head of 459 feet at BEP and full impeller diameter and the number of stages required for testing (see [section 1.2.2](/cfr/10/1.2.2.md) of appendix A of this subpart);
      - (C) Design temperature range wholly or partially in the range of 15 to 250 °F;
      - (D) **Designed to operate with either—** (1) A 2- or 4- or 6-pole induction motor, or

        (2) A non-induction motor with a speed of rotation operating range that includes speeds of rotation between 2,880 and 4,320 revolutions per minute (rpm) and/or 1,440 and 2,160 rpm and/or 960 and 1,439 revolutions per minute, and in each case, the driver and impeller must rotate at the same speed;

      - (E) For ST, and VT pumps, a 6-inch or smaller bowl diameter; and
      - (F) For ESCC, and ESFM pumps, a specific speed less than or equal to 5,000 when calculated using U.S. customary units.
  - (2) **Testing and calculations.** Determine the applicable constant load pump energy index (PEICL) or variable load pump energy index (PEIVL) using the test procedure set forth in appendix A of this subpart.
- (b) **Dedicated-purpose pool pumps—**
  - (1) **Scope.** This [paragraph (b)](#b) provides the test procedures for determining the weighted energy factor (WEF), rated hydraulic horsepower, dedicated-purpose pool pump nominal motor horsepower, dedicated-purpose pool pump motor total horsepower, dedicated-purpose pool pump service factor, and other pump performance parameters for:
    - (i) **The following varieties of dedicated-purpose pool pumps—**
      - (A) Self-priming pool filter pumps;
      - (B) Non-self-priming pool filter pumps;
      - (C) Waterfall pumps; and
      - (D) Pressure cleaner booster pumps;
    - (ii) Served by single-phase or polyphase input power;
    - (iii) **Except for—**
      - (A) Submersible pumps; and
      - (B) Self-priming and non-self-priming pool filter pumps with hydraulic output power greater than or equal to 2.5 horsepower.
  - (2) **Testing and calculations.** Determine the weighted energy factor (WEF) using the test procedure set forth in appendix B or appendix C of this subpart, as applicable.
- (c) **Circulator pumps—**
  - (1) **Scope.** This [paragraph (c)](#c) provides the test procedures for determining the circulator energy index for circulator pumps that are also clean water pumps, including on-demand circulator pumps and circulators-less-volute, and excluding submersible pumps and header pumps.
  - (2) **Testing and calculations.** Determine the circulator energy index (CEI) using the test procedure set forth in appendix D of this subpart Y.

## Notes

### Amendments

[82 FR 36923, Aug. 7, 2017, as amended at 87 FR 57299, Sept. 19, 2022; 88 FR 17978, Mar. 24, 2023]

### Source

Source: 81 FR 4145, Jan. 25, 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 36923, Aug. 7, 2017, as amended at 87 FR 57299, Sept. 19, 2022; 88 FR 17978, Mar. 24, 2023]