#### § 431.465 Circulator pumps energy conservation standards and their compliance dates.

(a) For the purposes of [paragraph (b)](/on/2024-09-17/title-10/section-431.465#p-431.465(b)) of this section, “PEICL” means the constant load pump energy index and “PEIVL” means the variable load pump energy index, both as determined in accordance with the test procedure in [§ 431.464](/on/2024-09-17/title-10/section-431.464). For the purposes of [paragraph (c)](/on/2024-09-17/title-10/section-431.465#p-431.465(c)) of this section, “BEP” means the best efficiency point as determined in accordance with the test procedure in [§ 431.464](/on/2024-09-17/title-10/section-431.464).

(b) Each pump that is manufactured starting on January 27, 2020 and that:

(1) Is in one of the equipment classes listed in the table in [paragraph (b)(4)](/on/2024-09-17/title-10/section-431.465#p-431.465(b)(4)) of this section;

(2) Meets the definition of a clean water pump in [§ 431.462](/on/2024-09-17/title-10/section-431.462);

(3) Is not listed in [paragraph (c)](/on/2024-09-17/title-10/section-431.465#p-431.465(c)) of this section; and

(4) Conforms to the characteristics listed in [paragraph (d)](/on/2024-09-17/title-10/section-431.465#p-431.465(d)) of this section must have a PEICL or PEIVL rating of not more than 1.00 using the appropriate C-value in the table in this [paragraph (b)(4)](/on/2024-09-17/title-10/section-431.465#p-431.465(b)(4)):

| Equipment class1 | Maximum PEI2 | C-value3 |
| --- | --- | --- |
| ESCC.1800.CL | 1.00 | 128.47 |
| ESCC.3600.CL | 1.00 | 130.42 |
| ESCC.1800.VL | 1.00 | 128.47 |
| ESCC.3600.VL | 1.00 | 130.42 |
| ESFM.1800.CL | 1.00 | 128.85 |
| ESFM.3600.CL | 1.00 | 130.99 |
| ESFM.1800.VL | 1.00 | 128.85 |
| ESFM.3600.VL | 1.00 | 130.99 |
| IL.1800.CL | 1.00 | 129.30 |
| IL.3600.CL | 1.00 | 133.84 |
| IL.1800.VL | 1.00 | 129.30 |
| IL.3600.VL | 1.00 | 133.84 |
| RSV.1800.CL | 1.00 | 129.63 |
| RSV.3600.CL | 1.00 | 133.20 |
| RSV.1800.VL | 1.00 | 129.63 |
| RSV.3600.VL | 1.00 | 133.20 |
| ST.1800.CL | 1.00 | 138.78 |
| ST.3600.CL | 1.00 | 134.85 |
| ST.1800.VL | 1.00 | 138.78 |
| ST.3600.VL | 1.00 | 134.85 |
| | | |
| --- | --- | --- |
| 1 Equipment class designations consist of a combination (in sequential order separated by periods) of: (1) An equipment family (ESCC = end suction close-coupled, ESFM = end suction frame mounted/own bearing, IL = in-line, RSV = radially split, multi-stage, vertical, in-line diffuser casing, ST = submersible turbine; all as defined in [§ 431.462](/on/2024-09-17/title-10/section-431.462)); (2) nominal speed of rotation (1800 = 1800 rpm, 3600 = 3600 rpm); and (3) an operating mode (CL = constant load, VL = variable load). Determination of the operating mode is determined using the test procedure in appendix A to this subpart. | | |
| 2 For equipment classes ending in .CL, the relevant PEI is PEICL. For equipment classes ending in .VL, the relevant PEI is PEIVL. | | |
| 3 The C-values shown in this table must be used in the equation for PERSTD when calculating PEICL or PEIVL, as described in section II.B of appendix A to this subpart. | | |

(c) The energy efficiency standards in [paragraph (b)](/on/2024-09-17/title-10/section-431.465#p-431.465(b)) of this section do not apply to the following pumps:

(1) Fire pumps;

(2) Self-priming pumps;

(3) Prime-assist pumps;

(4) Magnet driven pumps;

(5) Pumps designed to be used in a nuclear facility subject to [10 CFR part 50](/on/2024-09-17/title-10/part-50), “Domestic Licensing of Production and Utilization Facilities”;

(6) Pumps meeting the design and construction requirements set forth in Military Specification MIL-P-17639F, “Pumps, Centrifugal, Miscellaneous Service, Naval Shipboard Use” (as amended); MIL-P-17881D, “Pumps, Centrifugal, Boiler Feed, (Multi-Stage)” (as amended); MIL-P-17840C, “Pumps, Centrifugal, Close-Coupled, Navy Standard (For Surface Ship Application)” (as amended); MIL-P-18682D, “Pump, Centrifugal, Main Condenser Circulating, Naval Shipboard” (as amended); MIL-P-18472G, “Pumps, Centrifugal, Condensate, Feed Booster, Waste Heat Boiler, And Distilling Plant” (as amended). Military specifications and standards are available for review at *<http://everyspec.com/MIL-SPECS>*.

(d) The energy conservation standards in [paragraph (b)](/on/2024-09-17/title-10/section-431.465#p-431.465(b)) of this section apply only to pumps that have the following characteristics:

(1) Flow rate of 25 gpm or greater at BEP at full impeller diameter;

(2) Maximum head of 459 feet at BEP at full impeller diameter and the number of stages required for testing;

(3) Design temperature range from 14 to 248 °F;

(4) Designed to operate with either:

(i) A 2- or 4-pole induction motor; or

(ii) 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 and/or 1,440 and 2,160 revolutions per minute; and

(iii) In either case, the driver and impeller must rotate at the same speed;

(5) For ST pumps, a 6-inch or smaller bowl diameter; and

(6) For ESCC and ESFM pumps, specific speed less than or equal to 5,000 when calculated using U.S. customary units.

(e) For the purposes of [paragraph (f)](/on/2024-09-17/title-10/section-431.465#p-431.465(f)) of this section, “WEF” means the weighted energy factor and “hhp” means the rated hydraulic horsepower, as determined in accordance with the test procedure in [§ 431.464(b)](/on/2024-09-17/title-10/section-431.464#p-431.464(b)) and applicable sampling plans in [§ 429.59 of this chapter](/on/2024-09-17/title-10/section-429.59).

(f) Each dedicated-purpose pool pump that is not a submersible pump and is manufactured starting on July 19, 2021 must have a WEF rating that is not less than the value calculated from the following table:

| Equipment class | | Minimum allowable WEF score [kgal/kWh] | Minimum allowable WEF score [kgal/kWh] |
| --- | --- | --- | --- |
| Dedicated-purpose pool pump variety | hhp Applicability | Motor phase | |
| Self-priming pool filter pumps | 0.711 hp ≤hhp <2.5 hp | Single | WEF = −2.30 \* ln (hhp) + 6.59. |
| Self-priming pool filter pumps | hhp <0.711 hp | Single | WEF = 5.55, for hhp ≤0.13 hp −1.30 \* ln (hhp) + 2.90, for hhp >0.13 hp. |
| Non-self-priming pool filter pumps | hhp <2.5 hp | Any | WEF = 4.60, for hhp ≤0.13 hp −0.85 \* ln (hhp) + 2.87, for hhp >0.13 hp. |
| Pressure cleaner booster pumps | Any | Any | WEF = 0.42. |

(g) Each integral cartridge filter pool pump and integral sand filter pool pump that is manufactured starting on July 19, 2021 must be distributed in commerce with a pool pump timer that is either integral to the pump or a separate component that is shipped with the pump.

(h) For all dedicated-purpose pool pumps distributed in commerce with freeze protection controls, the pump must be shipped with freeze protection disabled or with the following default, user-adjustable settings:

(1) The default dry-bulb air temperature setting is no greater than 40 °F;

(2) The default run time setting shall be no greater than 1 hour (before the temperature is rechecked); and

(3) The default motor speed shall not be more than 1⁄2 of the maximum available speed.

(i) Each circulator pump that is manufactured starting on May 22, 2028 and that meets the criteria in [paragraphs (i)(1)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(1)) through [(i)(2)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(2)) of this section must have a circulator energy index (“CEI”) rating (as determined in accordance with the test procedure in [§ 431.464(c)(2)](/on/2024-09-17/title-10/section-431.464#p-431.464(c)(2))) of not more than 1.00 using the instructions in [paragraph (i)(3)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(3)) of this section and with a control mode as specified in [paragraph (i)(4)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(4)) of this section:

(1) Is a clean water pump as defined in [§ 431.462](/on/2024-09-17/title-10/section-431.462).

(2) Is not a submersible pump or a header pump, each as defined in [§ 431.462](/on/2024-09-17/title-10/section-431.462).

(3) The relationships in this [paragraph (i)(3)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(3)) are necessary to calculate maximum CEI.

(i) Calculate CEI according to the following equation:

Equation 1 to Paragraph (i)(3)(i)

[![](https://img.federalregister.gov/ER20MY24.067/ER20MY24.067_large.png)](https://img.federalregister.gov/ER20MY24.067/ER20MY24.067_original_size.png)

Where:

CEI = the circulator energy index (dimensionless);

CER = the circulator energy rating (hp), determined in accordance with section 6 of appendix D to subpart Y of part 431; and

CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp), determined in accordance with [paragraph (i)(3)(ii)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(3)(ii)) of this section.

(ii) Calculate CERSTD according to the following equation:

Equation 2 to Paragraph (i)(3)(ii)

[![](https://img.federalregister.gov/ER20MY24.068/ER20MY24.068_large.png)](https://img.federalregister.gov/ER20MY24.068/ER20MY24.068_original_size.png)

Where:

CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp);

i = the index variable of the summation notation used to express CERSTD (dimensionless) as described in the table 3 to paragraph (i)(3)(ii), in which i is expressed as a percentage of circulator pump flow at best efficiency point, determined in accordance with the test procedure in [§ 431.464(c)(2)](/on/2024-09-17/title-10/section-431.464#p-431.464(c)(2));

ωi = the weighting factor (dimensionless) at each corresponding test point, i, as described in table 3 to paragraph (i)(3)(ii); and Piin,STD = the reference power input to the circulator pump driver (hp) at test point i, calculated using the equations and method specified in [paragraph (i)(3)(iii)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(3)(iii)) of this section.

Table 3 to Paragraph (i)(3)(ii)

| I (%) | Corresponding ωi |
| --- | --- |
| 25 | .25 |
| 50 | .25 |
| 75 | .25 |
| 100 | .25 |

(iii) Calculate Piin,STD according to the following equation:

Equation 3 to Paragraph (i)(3)(iii)

[![](https://img.federalregister.gov/ER20MY24.069/ER20MY24.069_large.png)](https://img.federalregister.gov/ER20MY24.069/ER20MY24.069_original_size.png)

Where:

Piin,STD = the reference power input to the circulator pump driver at test point i (hp);

Pu,i = circulator pump basic model rated hydraulic horsepower (hp) determined in accordance with [10 CFR 429.59(a)(2)(i)](/on/2024-09-17/title-10/section-429.59#p-429.59(a)(2)(i));

αi = part-load efficiency factor (dimensionless) at each test point i as described in table 4 to paragraph (i)(3)(iii); and

ηWTW,100% = reference circulator pump wire-to-water efficiency at best efficiency point (%) at the applicable energy conservation standard level, as described in table 5 to paragraph (i)(3)(iii) as a function of circulator pump basic model rated hydraulic horsepower at 100% BEP flow, Pu,100%.

Table 4 to Paragraph (i)(3)(iii)

| I (%) | Corresponding αi |
| --- | --- |
| 25 | 0.4843 |
| 50 | 0.7736 |
| 75 | 0.9417 |
| 100 | 1 |

Table 5 to Paragraph (i)(3)(iii)

| Pu,100 % | ηWTW,100 % |
| --- | --- |
| <1 | 10\*ln(Pu,100 % + 0.001141) + 67.78. |
| ≥1 | 67.79%. |

(4) A circulator pump subject to energy conservation standards as described in this [paragraph (i)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)) must achieve the maximum CEI as described in [paragraph (i)(3)(i)](/on/2024-09-17/title-10/section-431.465#p-431.465(i)(3)(i)) of this section and in accordance with the test procedure in [§ 431.464(c)(2)](/on/2024-09-17/title-10/section-431.464#p-431.464(c)(2)) in the least consumptive control mode in which it is capable of operating.

[[81 FR 4431](https://www.federalregister.gov/citation/81-FR-4431), Jan. 26, 2016, as amended at [82 FR 5742](https://www.federalregister.gov/citation/82-FR-5742), Jan. 18, 2017; [89 FR 44356](https://www.federalregister.gov/citation/89-FR-44356), May 20, 2024]