EN 16480:2021

SLOVENSKI STANDARD
01-december-2021
Nadomešča:
SIST EN 16480:2016
Črpalke - Centrifugalne črpalke - Minimalna zahtevana učinkovitost vodnih črpalk
in določevanje minimalnega indeksa učinkovitostii (MEI)
Pumps - Rotodynamic pumps - Minimum required efficiency of water pumps and
determination of Minimum Efficiency Index (MEI)
Pumpen - Kreiselpumpen - Geforderte Mindesteffizienz für Wasserpumpen sowie
Bestimmung des Minimum Effizienz Indexes (MEI)
Pompes - Pompes rotodynamiques - Rendement minimal requis des pompes à eau et
détermination de l'Indice de rendement minimal (MEI)
Ta slovenski standard je istoveten z: EN 16480:2021
ICS:
23.080 Črpalke Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 16480
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2021
EUROPÄISCHE NORM
ICS 23.080 Supersedes EN 16480:2016
English Version
Pumps - Rotodynamic pumps - Minimum required
efficiency of water pumps and determination of Minimum
Efficiency Index (MEI)
Pompes - Pompes rotodynamiques - Rendement Pumpen - Kreiselpumpen - Geforderte Mindesteffizienz
minimal requis des pompes à eau et détermination de für Wasserpumpen sowie Bestimmung des Minimum
l'Indice de rendement minimal (MEI) Effizienz Indexes (MEI)
This European Standard was approved by CEN on 11 July 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16480:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 List of quantities with definitions . 5
3.2 General definitions . 7
4 Symbols and abbreviations . 8
5 Minimum Required Efficiencies and Minimum Efficiency Index . 10
5.1 The concept of “house of efficiency” . 10
5.2 Mathematical representation of minimum required efficiency . 12
5.3 Minimum efficiency at part load and overload . 13
5.4 Minimum Efficiency Index . 13
6 Determination of the Efficiency of a Test Pump . 16
6.1 General . 16
6.2 Test Procedures . 16
6.3 Test conditions . 17
6.4 Measurement uncertainties . 18
6.4.1 Relevance . 18
6.4.2 Fluctuations . 18
6.4.3 Statistical evaluation of overall measurement uncertainty . 18
6.5 Evaluation of test data . 20
6.5.1 Conversion of the test results to the nominal speed of rotation or to the nominal electric
frequency . 20
6.5.2 Performance curves . 21
6.5.3 Determination of the values relevant for the qualification of MEI . 22
6.5.4 Procedures for testing and/or evaluation of special pump types . 23
7 Proving the Minimum Efficiency Index of a pump size . 24
7.1 General remarks . 24
7.2 Determination of the Minimum Efficiency Index of a pump size . 24
Annex A (normative) Pump types in scope . 27
Annex B (informative) General remarks on the efficiency of rotodynamic pumps . 29
Annex C (informative) Mean Values of Minimum Efficiency Index for a Pump Size . 31
C.1 General . 31
C.2 Confidence interval on the mean value . 32
C.3 Outlier test . 34
C.4 Numerical example . 35
Annex ZA (informative) Relationship between this European Standard and the Ecodesign
requirements of Commission Regulation (EU) No 547/2012 [OJEU L 165/28 of
26 June 2012] aimed to be covered . 37
Bibliography . 38
European foreword
This document (EN 16480:2021) has been prepared by Technical Committee CEN/TC 197 “Pumps”, the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2022, and conflicting national standards shall be withdrawn at
the latest by April 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16480:2016.
The main changes compared to the previous edition are as follows:
— the title and scope have been modified by the removal of the verification aspect throughout this document;
— Clause 3 on Terms and Definitions has been modified;
— Clause 6 on the determination of the Efficiency of a Test Pump has been updated;
— informative Annex D dealing with methods recommended for manufacturers to determine the mean
values of hydraulic quantities of a size relevant for MEI has been deleted;
— informative Annex E giving a numerical example and informative Annex F describing the application of
mathematical statistics on tests have been deleted;
— informative Annexes G, H and I, dealing with measurement uncertainties, the methodology of the
verification procedure and the reporting of test results, respectively, have been deleted;
— the Annex ZA showing the relationship between this European Standard and the Ecodesign requirements
of Commission Regulation (EU) No 547/2012 has been updated.
This document has been prepared under a Standardization Request given to CEN by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s) /
Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part of
this document.
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Introduction
Purpose and content of this document
The water pumps within the scope of this document are typically produced and sold by pump manufacturers
as series of large to very large numbers. The performance characteristics of pumps of one size produced by a
manufacturer show some scatter caused by manufacturing tolerances but are described by mean values and
curves which represent that size.
The total consumption of electric energy by water pumps installed in applications within the scope of this
document depends on the total number of installed pumps of each size and on its mean efficiency. The quality
of a size in respect to its mean efficiency is quantitatively described by the Minimum Efficiency Index (MEI)
which is defined and used in this document. To achieve a certain value of the Minimum Efficiency Index (MEI),
a corresponding minimum value of the mean efficiency of a size is required.
This document defines – for each pump type and size within the scope of this document - the minimum
required value of efficiency regarding a certain value of the Minimum Efficiency Index (MEI).
Normally, the qualification of a pump size for a certain MEI value done by the manufacturer will be based on
tests and evaluations made on a sample of pumps of this size. Tests and evaluations carried out for the purpose
of qualifying the corresponding size should fulfil certain requirements:
— From the tests on the sample pumps, it becomes possible to predict for the corresponding size the
confidence intervals within which the true mean values of efficiencies which are relevant for the
qualification are enclosed with a sufficiently high probability. Only in that way, the qualification of the size
in respect to a required and/or indicated value of Minimum Efficiency Index (MEI) will ensure that the
aspired effect of energy saving will be reached;
— This document provides manufacturers with a test procedure which confidently provides the MEI value
which is representative of the pump size.
Caused by technical alignment procedures of the single pump components e.g. bearings or shaft seals the
performance of the pump is gained after a certain running-in time.
Ways to prove the Minimum Efficiency Index (MEI) of a pump size
This document describes different ways how manufacturers can achieve the qualification of a pump size for a
certain value of the Minimum Efficiency Index (MEI)
The MEI value shall be based on the mean value of the type series. Annex C describes methods to determine
the mean value of MEIs and their confidence intervals.
A test to determine MEI-values on pumps of the size in question according to the requirements given in 6.2 to
6.4 of this document as well as evaluations as described in 6.5 of this document needs application of the
methodology and procedure described in Clause 5 of this document.
Relevance of clauses of this document for qualification
Clause 5 describes nominal values of minimum required efficiency for a certain value of the Minimum
Efficie
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