1. (a) General pumps—(1) Scope. This paragraph (a) provides the test procedures for determining the constant and variable load pump energy index for:

   1. (i) The following categories of clean water pumps that have the characteristics listed in paragraph (a)(1)(iii) of this section.

      1. (A) End suction close-coupled (ESCC);
      2. (B) End suction frame mounted/own bearings (ESFM);
      3. (C) In-line (IL);
      4. (D) Radially split, multi-stage, vertical, in-line casing diffuser (RSV); and
      5. (E) Submersible turbine (ST) pumps.

   2. (ii) The additional following categories of clean water pumps that have the characteristics listed in paragraph (a)(1)(iii) of this section:

      1. (A) Radially-split, multi-stage, horizontal, end-suction diffuser casing (RSHES);
      2. (B) Radially-split, multi-stage, horizontal, in-line diffuser casing (RSHIL);
      3. (C) Small vertical in-line (SVIL); and
      4. (D) Vertical Turbine (VT).

   3. (iii) Pump characteristics:

      1. (A) Flow rate of 25 gpm or greater at BEP and full impeller diameter;
      2. (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 of appendix A of this subpart);
      3. (C) Design temperature range wholly or partially in the range of 15 to 250 °F;

      4. (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;

      5. (E) For ST, and VT pumps, a 6-inch or smaller bowl diameter; and
      6. (F) For ESCC, and ESFM pumps, a specific speed less than or equal to 5,000 when calculated using U.S. customary units.
      7. (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.

2. (b) Dedicated-purpose pool pumps—(1) Scope. This paragraph (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:

   1. (i) The following varieties of dedicated-purpose pool pumps:

      1. (A) Self-priming pool filter pumps;
      2. (B) Non-self-priming pool filter pumps;
      3. (C) Waterfall pumps; and
      4. (D) Pressure cleaner booster pumps;
   2. (ii) Served by single-phase or polyphase input power;

   3. (iii) Except for:

      1. (A) Submersible pumps; and
      2. (B) Self-priming and non-self-priming pool filter pumps with hydraulic output power greater than or equal to 2.5 horsepower.
      3. (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.
3. (c) Circulator pumps—(1) Scope. This paragraph (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.
4. (2) Testing and calculations. Determine the circulator energy index (CEI) using the test procedure set forth in appendix D of this subpart Y.

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