oSIST prEN 17038-4:2021

Pumps - Methods of qualification of the Energy Efficiency Index for rotodynamic pump units - Part 4: Testing and calculation of energy efficiency index (EEI) of submersible multistage pump units

This document specifies methods and procedures for testing, calculating, and determining the Energy Efficiency Index (EEI) of submersible multistage pump units.

Pumpen - Methoden zur Qualifikation des Energieeffizienzindexes für Kreiselpumpen - Teil 4: Prüfung und Berechnung des Energieeffizienzindexes (EEI) mehrstufiger Tauchmotorpumpenaggregate

Dieses Dokument legt Methoden und Verfahren zur Prüfung, Berechnung und Bestimmung des Energieeffizienzindex (EEI) von mehrstufigen Tauchmotorpumpen fest.

Pompes - Méthodes de qualification de l'indice de rendement des groupes motopompes rotodynamiques - Partie 4 : Essais et calcul de l'indice de rendement énergétique (EEI) pour les unités de pompage submersibles des forages

Le présent document spécifie les méthodes et modes opératoires d'essai, de calcul et de détermination de l'indice d'efficacité énergétique (EEI) des groupes motopompes submersibles multi-étagés.

Črpalke - Metode za opredelitev indeksa energijske učinkovitosti centrifugalnih črpalk - 4. del: Preskušanje in računanje indeksa energijske učinkovitosti (IEE)

General Information

• Status: Not Published
• Public Enquiry End Date: 31-Oct-2021
• ICS: 23.080 - Pumps
• ICS: 27.015 - Energy efficiency. Energy conservation in general
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Aug-2023
• Due Date: 27-Sep-2023
• Ref Project: FprEN 17038-4 - Pumps - Methods of qualification of the Energy Efficiency Index for rotodynamic pump units - Part 4: Testing and calculation of energy efficiency index (EEI) of submersible multistage pump units

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17038-4:2021
01-oktober-2021
Črpalke - Metode za opredelitev indeksa energijske učinkovitosti centrifugalnih
črpalk - 4. del: Preskušanje in računanje indeksa energijske učinkovitosti (IEE)

Pumps - Methods of qualification of the Energy Efficiency Index for rotodynamic pump

units - Part 4: Testing and calculation of energy efficiency index (EEI) of submersible

multistage pump units

Pumpen - Methoden zur Qualifikation des Energieeffizienzindexes für Kreiselpumpen -

Teil 4: Prüfung und Berechnung des Energieeffizienzindexes (EEI) mehrstufiger
Tauchmotorpumpenaggregate

Pompes - Méthodes de qualification de l'indice de rendement des groupes motopompes

rotodynamiques - Partie 4 : Essais et calcul de l'indice de rendement énergétique (EEI)

pour les unités de pompage submersibles des forages
Ta slovenski standard je istoveten z: prEN 17038-4
ICS:
23.080 Črpalke Pumps
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
oSIST prEN 17038-4:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17038-4:2021
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oSIST prEN 17038-4:2021
DRAFT
EUROPEAN STANDARD
prEN 17038-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 23.080
English Version
Pumps - Methods of qualification of the Energy Efficiency
Index for rotodynamic pump units - Part 4: Testing and
calculation of energy efficiency index (EEI) of submersible
multistage pump units

Pompes - Méthodes de qualification de l'indice de Pumpen - Methoden zur Qualifikation des

rendement des groupes motopompes rotodynamiques Energieeffizienzindexes für Kreiselpumpen - Teil 4:

- Partie 4 : Essais et calcul de l'indice de rendement Prüfung und Berechnung des Energieeffizienzindexes

énergétique (EEI) pour les unités de pompage (EEI) mehrstufiger Tauchmotorpumpenaggregate

submersibles des forages

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 197.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
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. prEN 17038-4:2021 E

worldwide for CEN national Members.
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
Contents Page

European foreword ............................................................................................................................................. 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 7

4 Symbols and abbreviations .............................................................................................................12

5 General conditions for the operation of submersible multistage pump units .............13

6 Reference flow-time profiles and reference pressure control curve ...............................14

6.1 General ....................................................................................................................................................14

6.2 Reference flow-time profiles ..........................................................................................................15

6.3 Reference pressure control curves ...............................................................................................15

7 Determination of average electric power input P by test ..........................................15

1,avg

7.1 General ....................................................................................................................................................15

7.1.1 General ....................................................................................................................................................15

7.1.2 Test conditions .....................................................................................................................................16

7.1.3 Measuring instrumentation ............................................................................................................17

7.1.4 Uncertainties of measured quantities .........................................................................................17

7.2 Measurement procedure ..................................................................................................................18

7.2.1 Measurement steps ............................................................................................................................18

7.2.2 Determination of Q100 % and H100 % .......................................................................................18

7.2.3 Determination of reference load points .....................................................................................18

7.2.4 Adjustment tolerances ......................................................................................................................19

7.2.5 Corrections for deviations in flow and head .............................................................................19

7.3 Calculation of P ..........................................................................................................................19

1,avg
8 Determination of average electric power input P by the means of a Semi-
1,avg

Analytical Model ..................................................................................................................................19

8.1 General ....................................................................................................................................................19

8.2 The semi-analytical model of submersible rotodynamic pumps ......................................20

8.3 Pump units in fixed speed operation ...........................................................................................21

8.3.1 General ....................................................................................................................................................21

8.3.2 The model of the electric motor.....................................................................................................21

8.3.3 Interaction of pump and motor ......................................................................................................21

8.3.4 Determination of Q and H .......................................................................................22

100 % 100 %

8.3.5 Determination of the P -value ............................................................................................22

1,avg,c

8.4 Pump units with a Power Drive System (PDS)..........................................................................24

8.4.1 General ....................................................................................................................................................24

8.4.2 The model of the Power Drive System (PDS) ............................................................................25

8.4.3 Interaction of pump and PDS ..........................................................................................................28

8.4.4 Determination of Q and H .......................................................................................29

100 % 100 %

8.4.5 Determination of P for pump units with PDS .................................................................29

1,avg

9 Determination of reference electric power input P ......................................................31

1,ref

10 Calculation of Energy Efficiency Index (EEI) .............................................................................33

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FprEN 17038-4:2021 (E)

Annex A (informative) Generation of input data for the models of components of a

submersible multistage pump unit .............................................................................................. 34

A.1 Input data for the model of a submersible rotodynamic pump ......................................... 34

A.2 Input data for the model of a submersible grid fed motor .................................................. 35

A.3 Input data for the model of a PDS consisting of submersible motor and CDM ............. 35

Annex B (informative) Experimental Determination of thrust bearing friction losses ........... 37

Annex C (informative) Determination of EEI values using data for RCDMs ................................. 38

Bibliography ....................................................................................................................................................... 39

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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
European foreword

This document (prEN 17038-4:2021) has been prepared by Technical Committee CEN/TC 197 “Pumps”,

the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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oSIST prEN 17038-4:2021
FprEN 17038-4:2021 (E)
Introduction

This document is the fourth part of a series of standards describing a methodology to evaluate energy

efficiency performance of submersible multistage pump units (MS-S), comprising a rotodynamic pump

part and a submersible motor which is either directly fed from the grid or combined with a frequency

converter (CDM) to form a Power Drive System (PDS). For consistency purposes with other referred

standards, CDM is used in this document. VSD, for variable speed drive, is the term used in Ecodesign

regulations. Rotodynamic pump and motor are designed with outer diameters and special design features

that enable to install them in boreholes and operate them completely surrounded by the pumped liquid.

The methodology is based on a non-dimensional numerical value called Energy Efficiency Index (EEI). An

EEI value allows the comparison of different configurations by one common indicator. Physical influences

such as size and stage number of the incorporated rotodynamic pump, unit part-load operation, motor-

efficiency characteristic and frequency converter influence are implemented into this metric.

Specific requirements for testing and a calculation method for EEI, the so called semi-analytical model

(SAM) of submersible multistage pump units, specific flow-time profiles and reference pressure control

curves are given in this document.

EEI is an index to rate submersible multistage pump units according to their energy efficiency but does

not replace the need to do a life-time cost analysis regarding energy consumption over the lifetime of the

submersible multistage pump unit.
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
1 Scope

This document specifies methods and procedures for testing, calculating, and determining the Energy

Efficiency Index (EEI) of submersible multistage pump units.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 16480:2021, Pumps — Rotodynamic pumps — Minimum required efficiency of rotodynamic water

pumps and determination of Minimum Efficiency Index (MEI)

EN 17038-1:2019, Pumps — Methods of qualification and verification of the Energy Efficiency Index for

rotodynamic pump units — Part 1: general requirements and procedures for testing and calculation of

Energy Efficiency Index (EEI)

EN 17038-2:2019, Pumps — Methods of qualification and verification of the energy efficiency index for

rotodynamic pump units — Part 2: Testing and calculation of energy efficiency index (EEI) of single pump

units

EN ISO 9906:2012, Rotodynamic pumps — Hydraulic performance acceptance tests — Grades 1, 2 and 3

(ISO 9906:2012)

EN ISO 17769-1:2012, Liquid pumps and installation — General terms, definitions, quantities, letter

symbols and units — Part 1: Liquid pumps (ISO 17769-1:2012)

EN 60034-1:2010, Rotating electrical machines — Part 1: Rating and performance (IEC 60034-1:2010)

EN 60034-2-1:2014, Rotating electrical machines — Part 2-1: Standard methods for determining losses and

efficiency from tests (excluding machines for traction vehicles) (IEC 60034-2-1:2014)

EN IEC 60034-2-3:2020, Rotating electrical machines — Part 2-3: Specific test methods for determining

losses and efficiency of converter-fed AC motors (IEC 60034-2020)

EN IEC 60038:2011/prA1:2020, {fragment 1}, Standard voltages for LVDC supply and LVDC equipment

(Proposed horizontal standard)

EN IEC 60038:2011/prA1:2020, {fragment 2}, Standard voltages for AC supply and AC equipment

(Proposed horizontal standard)

EN IEC 60038:2011/prA1:2020, {fragment 3}, Standard voltages for DC and AC traction systems (Proposed

horizontal standard)

EN 61800-9-2:2017, Adjustable speed electrical power drive systems — Part 9-2: Ecodesign for power drive

systems, motor starters, power electronics and their driven applications — Energy efficiency indicators for

power drive systems and motor starters (IEC 61800-9-2:2017)
As impacted by EN 17038-2:2019/AC:2020.
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FprEN 17038-4:2021 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 17769-1:2012 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
submersible multistage water pump unit
MS-S

a submersible multistage water pump unit is composition of submersible multistage pump and

submersible borehole motor with or without Variable Speed Drive (VSD)
3.2
submersible borehole motor

electric motor designed to be operated submersed at operating temperatures not below 0 °C and not

above 40 °C
3.3
submersible multistage pump
MSS

multistage (i > 1) rotodynamic water pump with a nominal outer diameter from 2,5″ (63,5 mm) up to 6″

(152,4 mm) designed to be operated submersed, at operating temperatures within a range of 0 °C and

90 °C; with a nominal flow rate > 1,75 m /h
3.4
clean water

water with a maximum non-absorbent free solid content of 0,25 kg/m , and with a maximum dissolved

solid content of 50 kg/m , provided that the total gas content of the water does not exceed the saturation

volume

Note 1 to entry: Any additives that are needed to avoid water freezing down to – 10 °C shall not be considered.

3.5
clean cold water
−6 2

clean water to be used for pump testing, with a maximum kinematic viscosity of 1,5 × 10 m /s, a

maximum density of 1 050 kg/m and a maximum temperature of 40 °C
3.6
fixed-speed pump unit
pump unit without a variable speed drive (VSD)
3.7
variable-speed pump unit
pump unit equipped with an VSD
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
3.8
complete drive module
CDM
variable speed drive
VSD

electronic power converter connected between the electric supply and a motor as well as extensions such

as protection devices, transformers and auxiliaries (according to EN 61800-2)
Note 1 to entry: This term is defined in EN 61800-2.
3.9
power drive system
PDS
combination of CDM and motor
3.10
check-valve
non-return valve

Note 1 to entry: Such a valve is often integrated in submersible multistage pump units.

3.11
constant flow
slight variation of the flow rate around the nominal value

Note 1 to entry: Caused by secondary influences from the process as, for example, the (moderately) varying level

of liquid in reservoirs, etc. The variation of flow rate occurs typically within the range which is covered by the

definition and determination of the Minimum Efficiency Index (MEI) of the pump (see EN 16480), and which is from

0,75 Q to 1,1 Q .
100 % 100 %
3.12
variable flow
widely varying flow rate

Note 1 to entry: Typically, at considerable fractions of the total operating time, the actual demand for pump flow

rate Q and pump head H is much lower than the values at the operating point of maximum flow rate which is

demanded by the application.
3.13
suction pressure
pressure at the inlet of submersible multistage pump

Note 1 to entry: All pressures are gauge pressures (relative to the ambient pressure).

3.14
discharge pressure
pressure at the outlet of a submersible multistage pump
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oSIST prEN 17038-4:2021
FprEN 17038-4:2021 (E)
3.15
total differential head

the total differential head (or only head) of the submersible multistage pump is according to Formula (1):

pp−
Hz= − z+ (1)
2 1
ρ⋅ g
where
H is the total differential head [m];
z is the geodetic height of reference level;
z is the geodetic height of dynamic water level;
p is the discharge pressure [Pa];
p is the suction pressure [Pa];
ρ is the density of the test water at 20 °C (= 998,2 kg/m );
g 2
is the gravitational constant (= 9,81 m/s ).
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
Key
1 pressure reading
2 reference plane
3 NPSH datum plane
p is the discharge pressure [Pa]
p is the suction pressure [Pa]
p is the density of the test water at 20 °C (i.e. 998,2 kg/m )
z geodetic height of reference level
z geodetic height of dynamic water level
z geodetic height of pressure reading to reference plane
Figure 1 — Designations in submersible borehole pump unit set-up

Note 1 to entry: The differences of dynamic head U /(2⋅g) (with c = flow velocity) and geodetic height z between

inlet and outlet of the submersible multistage pump are typically very small compared to the pressure head and are,

therefore, neglected in Formula (1).
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oSIST prEN 17038-4:2021
FprEN 17038-4:2021 (E)
3.16
hydraulic power

arithmetic product of the flow Q and the head H, and a constant a per Formula (2):

P = ρ⋅ Q⋅⋅gH (2)
hyd
where
P is the hydraulic power [W];
hyd
Q is the flow [m /s];
H is the total head [m];
g gravitational constant 9,81 m/s ;
ρ is the density of fluid [kg/m ].
3.17
electric power input
electric power supplied:
— to the motor in the case of a (grid fed) fixed speed pump unit;
— to the CDM in the case of a variable speed pump unit
3.18
pump unit efficiency
ratio of hydraulic power Phyd and electric power input P
3.19
pump unit best efficiency point
Q /H
BEP,unit BEP,unit

flow-head-point where the pump unit runs at its best unit efficiency point and at maximum operation

3.20
reference flow rate, Q
100%
3 3

flow per time unit [m /s] or [m /h] at the Best Efficiency Point (BEP) of the pump unit

3.21
reference head, H
100%
total differential head [m] at the Best Efficiency Point (BEP) of the pump unit
3.22
control curve

functional dependency of the demanded head H vs. the delivered flow rate Q in the form of a non-

dimensional correlation H/H = f (Q/Q )
100% 100%
3.23
reference control curve

pre-defined functional dependency H/H = f (Q/Q ) for standardised measurements and

100% 100%
calculations of average power input P
1, avg
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)
3.24
flow-time profile

relation between flow rate intervals and relative operation time pattern of percentiles of time where the

pump unit runs at a given flow rate
3.25
Minimum Efficiency Index (MEI)
dimensionless number for the energy efficiency of pumps
Note 1 to entry: This term is defined in EN 16480:2021.
4 Symbols and abbreviations
For the purpose of this document, the symbols and units given in Table 1 apply.
Table 1 — Symbols and units
Symbol Designation Unit
g Gravitational constant m/s
H (Total differential) head m
H (Total differential) head at best efficiency point of a pump m
BEP,PU
H Geodetic head m
geo
H Head loss caused by a check-valve m
L,cv
H Measured head m
meas
H Reference head m
ref
H Head loss of the supplied hydraulic system m
resistance
H Head at 100 % operating point m
100%
i Stage number of multistage pumps -
i Consecutive number of load points [-]
k Number of supporting points [-]
K Constant in Formula (3) 2 5 2 5
s /m or h /m
n Rotational speed -1
min
n Nominal rotational speed of a pump -1
N,PU min
n Specific speed of a pump -1
s min
N Total number of load points [-]
p Pressure bar (g)
p Suction pressure bar (g)
p Discharge pressure bar (g)
P Electric power input W, kW
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oSIST prEN 17038-4:2021
FprEN 17038-4:2021 (E)
Symbol Designation Unit
P Reference value of electric power input W, kW
1,ref
P Measured electric power input W, kW
1,meas
P Mechanical power transmitted by the motor to the W, kW
hydraulic pump part
P Shaft power output of the calibrated submersible W, kW
2,calibrated
borehole motor without axial thrust load
P Power loss W, kW
Q Flow rate m /h
Q m /h
Flow rate at best efficiency point of a pump unit
BEP,PU
Q Reference flow rate m /h
ref
Q Flow rate from test m /h
test
Q 100%-flow rate m /h
100%
s Slip of rotational motor speed [-] or %
t Time s; min; h
T Torque N⋅m
η Efficiency [-] or %
ρ Density 3
kg/m
5 General conditions for the operation of submersible multistage pump units

In the majority of applications, submersible multistage pump units are installed and operated in

boreholes. In these cases, the hydraulic circuit connected to the pump unit is an open loop system with

predominant geodetic head H . The resistance curve that determines the operating points of the pump

geo
unit is of the type given by Formula (3):
H H+⋅KQ (3)
resis tan ce geo

where typically the head loss caused by friction losses in the piping K⋅Q is much smaller than the

geodetic head H .
geo

Depending on the individual application, the range of flow rate demand may be rather small (“constant

flow”) or rather wide (“variable flow”).

Especially in the case of remarkably varying demand for delivered flow rate, it is advantageous (in respect

to energy consumption) to operate the pump unit at variable speed. This mode of operation requires a

variable speed driven pump. In other cases, it may be adequate to operate the pump unit at fixed speed,

i.e. to feed the electric motor directly by the grid.
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6 Reference flow-time profiles and reference pressure control curve
6.1 General

According to the two different modes of operation (constant or variable flow), two different reference

flow-time profiles are relevant (see 6.3) that lead to two different numerical values of EEI. These values

are designated as EEI (concerning the constant flow operation mode) and EEI (concerning the variable

C V
flow operation mode).

In the constant flow mode of operation, the operating points for the determination of EEI are defined to

be the values of the flow rate Q according to the corresponding reference flow-time profile (see 6.3) and

the values of pump head H according to the Q-H curve of the actual pump unit at constant (grid) frequency.

Insofar, this Q-H curve stands for the reference pressure control curve for EEI .

On the other hand, in the variable flow mode of operation the reference pressure control curve for EEI

is based on the assumption of a constant pump head H which is independent of the delivered flow rate Q

and is equal to H (see 6.3).
100 %

When putting submersible multistage pump units into service an appropriate value of EEI shall be made

available. The EEI shall be for constant flow (EEI ) and/or variable flow (EEI ) according to the demand

C V

of the application in which the pump unit is put into service or for which the pump unit is specified, when

placed on the market. The corresponding flow-time profiles and pressure control curves are given in

Table 2.

Table 2 — Reference flow-time profiles and reference pressure control curves for submersible

multistage pump units
Mode
Reference Reference Applicable Q/H appli-
flow-time pressure test points cable
# Demand of Type of
profile EEI
control curve
application pump unit
M1 constant fixed speed constant Q-H curve of on Q/H curve of EEI
flow flow the pump unit the pump unit
(Table 3)
M2 variable flow fixed speed variable Formula (4) on Q-H curve of EEI
flow the pump unit
(Table 4)
M3 constant variable constant Q-H curve of on Q-H curve of EEI
flow speed flow the pump unit the pump unit
(Table 3) (measured at
fixed speed)
M4 variable flow variable variable Formula (4) Q/H points de- EEI
speed flow fined by
(Table 4) Formula (4)
M5 constant variable variable Formula (4) Q/H points de- EEI
flow, varying speed flow fined by
head (Table 4) Formula (4)
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FprEN 17038-4:2021 (E)
6.2 Reference flow-time profiles

The reference flow-time profile for constant flow operation is specified by the values given in Table 3.

Table 3 — Reference flow-time profile for constant flow operation
Flow Q in % of Q
75 100 110
100%
Time Δt in % of total operating time 25 50 25

The reference flow-time profile for variable flow operation is specified in Table 4.

Table 4 — Reference flow-time profile for variable flow operation
Flow Q in % of Q
100%
25 50 75 100
10 40 40 10
Time Δt in % of total operating time
NOTE 1 Q is defined in 3.20.
100 %

NOTE 2 The time fractions of total operating time that are specified in Tables 3 and 4 as values to be used for the

determination of EEI are based on comprehensive experience of manufacturers of submersible pumps in respect to

typical applications and operational conditions of their products.
6.3 Reference pressure control curves

In the case of the variable flow demand (modes M2 and M4), the reference control curve shall be defined

by Formula (4):
H H or H /%H 100
ii100% 100% 
(4)

In the case of the constant flow operation mode (modes M1 and M3), the reference control curve is the Q-

H curve of the actual pump unit applied to define Q H (see 7.2.2 and 8.3.4).
100 %, 100 %

In the case of the constant flow and varying head demand (mode M5), the reference control curve shall be

defined by Formula (4).
NOTE H is defined in 3.21.
100 %
7 Determination of average electric power input P by test
1,avg
7.1 General
7.1.1 General

This clause specifies performance tests and evaluations on submersible multistage pump units.

Such tests shall provide the necessary information on the actual performance values of tested

submersible multistage pump units needed for the calculation of the EEI-value according to its definition

given in EN 17038-1:2019, Clause 4.
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oSIST prEN 17038-4:2021
prEN 17038-4:2021 (E)

All provisions for the test concerning the submersible multistage pump unit (taken as “black box” and

treated as a pump unit as those covered by EN 17038-2:2019) shall be in accordance with

EN ISO 9906:2012, grade 2. The exception for power of
...