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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules To test twin head circulator pumps, one of the two impeller assemblies is to be incorporated into an adequate, single impeller volute and casing. An adequate, single impeller volute and casing means a volute and casing for which any physical and functional characteristics that affect energy consumption and energy efficiency are essentially identical to their corresponding characteristics for a single impeller in the twin head circulator volute and casing.
To test circulators-less-volute, pair the circulator-less-volute with specific volutes with which the circulator is advertised to be paired, based on manufacturers literature, to determine the PEI rating for each circulatorless-volute and volute combination.

Docket No. EERE2016BTSTD0004, No. 58 Recommendations 11 and 12
at p. 9
DOE seeks comment on whether the recommendations for twin-head circulator pumps and circulators-lessvolute have been adequately addressed in HI 40.62021.
D. Metric and Test Procedure for SVIL
Pumps The CPWG recommended evaluating SVIL pumps using the constant load pump energy index PEICL or variable load pump energy index PEIVL metric, similar to general pumps, and using the general pump test procedure to measure performance, with any additional modifications necessary as determined by DOE. Docket No. EERE2016BT
STD0004, No. 98 Recommendations 1B at pp. 12 In the January 2016 TP
final rule, DOE adopted a metric of PEICL for pumps distributed in commerce as bare pumps or as bare pumps with a motor i.e., pumps sold without continuous or non-continuous controls and a metric of PEIVL for pumps sold with either continuous or non-continuous controls. 81 FR 4086, 41504152 Jan. 25, 2016
DOE identified the size and characteristics of the motor with which the SVIL pumps are rated as the primary difference between SVIL and IL pumps that affects the application of the DOE
general pumps test procedure.
Specifically, the general pumps test procedure establishes that testing-based methods are applicable to all pump configurations, while calculation-based methods are applicable only to 1
pumps sold with neither a motor nor controls i.e., a bare pump, 2 pumps sold with motors that are subject to DOEs energy conservation standards for electric motors, as defined pursuant to 10 CFR 431.25g, with or without continuous controls, and 3 pumps sold with submersible motors with or without continuous controls. This is because the calculation-based test methods presume motor efficiency and
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motor or motor and drive loss values based on the performance characteristics of motors that are subject to DOEs current energy conservation standards for electric motors at 10 CFR
431.25. Table 1 to appendix A to subpart Y of 10 CFR part 431.
SVIL pumps are often distributed in commerce with motors that are either subject to DOEs electric motor regulations at 10 CFR 431.25 or DOEs small electric motor regulations at 10
CFR 431.466. Therefore, the calculationbased test methods may need to be modified to reference DOEs electric motor regulations at 10 CFR 431.25 or DOEs small electric motor regulations at 10 CFR 431.446, as applicable.
DOE also notes that the general pumps test procedure includes the requirement that all pumps sold with single-phase motors be rated as bare pumps. Table 1 to appendix A to subpart Y of 10 CFR part 431. SVIL
pumps sold with single-phase motors could instead be rated to reflect the performance of that single-phase motor, either through the testing or calculationbased methods.
In addition, the general pumps test procedure relies on nominal motor losses to calculate the PERSTD and PERCL for the calculation-based method and nominal motor and drive losses to calculate PERVL. Both the motor and combined motor and drive loss curves were developed for the general pumps test procedure based on data from the National Electrical Manufacturers Association NEMA and from manufacturers of motors and drives, as well as data from DOEs own testing, for motors and drives from 1 to 250 hp gathered during the general pumps test procedure rulemaking. Since these losses were based on data for motors and drives from 1 to 250 hp, the nominal motor losses derived for the general pumps test procedure may not be appropriate for SVIL pumps. DOE
researched typical losses for motors and combined motor and drive assemblies for motors that were less than 1 hp.
Based on the information DOE received, the part load loss curves, or the variation in efficiency as a function of load, does not vary significantly between 1 hp motors and drives and motors and drives that are less than 1
hp.
DOE requests comment on the recommendation to test SVIL pumps with the test methods in the general pumps test procedure and additional provisions to account for the differences in size and characteristics of SVIL pump motors. In particular, DOE requests comment on the potential extension of the nominal full load motor efficiency
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values to reference DOEs small electric motor regulations, including certain single-phase motors, and the need for an exception for SVIL pumps so that those sold with single-phase motors do not have to be rated as bare pumps.
DOE also requests comment on the prevalence of SVIL pumps sold with single-phase versus three-phase motors, and the prevalence of SVIL pumps sold with motors not covered by DOEs small electric motors and electric motors energy conservation standards for either singleor three-phase motors.
DOE also requests comment on whether the equations used to establish the part load motor and drive losses in the general pumps test procedure are appropriate for SVIL pumps under one horsepower. If inappropriate, DOE
requests data supporting the generation of alternative loss curves.
III. Request for Information and Comments Pertaining to Energy Conservation Standards DOE is publishing this RFI to collect data and information to inform its decision, consistent with its obligations under EPCA, as to whether the Department should proceed with an energy conservation standards rulemaking. In the following sections, DOE has identified a variety of issues on which it seeks input to aid in the development of the technical and economic analyses regarding whether standards for circulator pumps and SVIL pumps may be warranted.
DOE seeks comment on whether establishing a standard for circulator pumps and SVIL pumps would be costeffective, economically justified, technologically feasible, or would result in a significant savings of energy.
For circulator pumps, the CPWG
reached agreement on the methodology, data sources, and assumptions required to conduct the analyses and reach consensus on a recommended standard level. Therefore, DOE is requesting comment only on specific inputs to the analyses that may need to be updated due to technological or market changes since the CPWG proceedings. However, because the CPWG did not analyze SVIL
pumps, DOE is requesting comment on several of the associated inputs to the analyses.
A. Market and Technology Assessment The market and technology assessment that DOE routinely conducts when analyzing the impacts of a potential new or amended energy conservation standard provides information about the circulator pumps and SVIL pumps industry that will be used in DOEs analysis throughout the
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