# Commission Regulation (EU) No 547/2012 of 25 June 2012 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for water pumps (Text with EEA relevance), Annex III: Measurements and calculations

Extent: E+W+S+N.I.

For the purposes of compliance and verification of compliance with the requirements of this Regulation, measurements and calculations shall be made using designated standards, or using other reliable, accurate and reproducible methods, which take into account the generally recognised state of the art, and produce results deemed to be of low uncertainty. They shall fulfil all of the following technical parameters.
The hydraulic pump efficiency, as defined in Annex I, is measured at the head and flow corresponding to the best efficiency point (BEP), part load (PL) and over load (OL) for full impeller diameter with clean cold water.
The formula for calculating the required minimum efficiency at best efficiency point (BEP) is as follows:ηΒΕΡmin requ=88,59 x + 13,46 y−11,48 x2−0,85 y2−0,38 x y−CPump Type,rpm
Where,
x = ln (ns); y = ln (Q) and ln = natural logarithm and Q = flow in [m3/h]; ns = specific speed in [min–1]; C = value found in Table.
The value of C depends on the pump type and nominal speed, and also the MEI value.
Table
Minimum efficiency index (MEI) and its corresponding C-value depending on the pump type and speed
C-value for MEICPumpType,rpm
MEI = 0,10
MEI = 0,40
C (ESOB, 1 450)
132,58
128,07
C (ESOB, 2 900)
135,6
130,27
C (ESCC, 1 450)
132,74
128,46
C (ESCC, 2 900)
135,93
130,77
C (ESCCi, 1 450)
136,67
132,3
C (ESCCi, 2 900)
139,45
133,69
C (MS-V, 2 900)
138,19
133,95
C (MSS, 2 900)
134,31
128,79
The requirements for part load (PL) and over load (OL) conditions are set at slightly lower values than those for 100 % flow (ηΒΕΡ).
ηPLmin, requ= 0,947 ×ηBEPmin, requ
ηOLmin, requ= 0,985 ×ηBEPmin, requ
All efficiencies are based on full (untrimmed) impeller. Vertical multistage water pumps are to be tested with a 3 stage (i = 3) version. Submersible multistage water pumps are to be tested with a 9 stage (i = 9) version. If this number of stages is not offered within the specific product range the next higher number of stages within the product range is to be chosen for testing.

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Source: https://www.legislation.gov.uk/eur/2012/547/annex/III (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-547/annex-III
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.