29.12.2012   

EN

Official Journal of the European Union

C 402/17

1.

All measurement shall be done according to ISO EN 9906 Class 2b. The exception specified in that standard for total tolerance of pump efficiency for pump power input of 10kW and below shall not be considered.

2.

The duration of the test shall be sufficient to obtain repeatable results; especially run-in effects shall be considered. Run-in effects may take up to 1 day operating time.

3.

All measurements shall be made under steady state conditions.

4.

The tests should be conducted under conditions where cavitation does not affect the performance of the pump.

5.

Pump efficiency is measured at the head and flow corresponding to the best efficiency point (BEP), part load (PL), and over load (OL) for full (untrimmed) impeller diameter with clean cold water, as defined in Commission Regulation (EU) No 547/2012.

6.

Vertical multistage water pumps are to be tested with a three stage (i = 3) version. Submersible multistage water pumps are to be tested with a nine 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 verification testing.

7.

A minimum of seven test points shall be taken for all verification tests within the range of 60 % to 120 % around the expected flow at the BEP. Four of these points shall be spaced between 60 % and 95 %, two between 105 % and 120 %, and one point chosen within 95 % to 105 % of the expected flow at the BEP. For the determination of the flow corresponding to BEP, PL, and OL, the flow-efficiency fitting curve must be represented by an appropriate mathematical expression. In the range of flow rates from PL to OL, the curve represented by the mathematical expression shall have only one maximum, and the second derivative of the mathematical expression must be negative. Appropriate methods for drawing the flow-efficiency fitting curve are polynomials of third order or spline functions. Alternatively, the nominal best flow value on the water pump's name plate or from the manufacturer's test reports can be chosen if provided.

8.

The required minimum efficiencies shall be calculated as set out in Annex III of Commission Regulation (EU) No 547/2012. The minimum efficiency index (MEI) for product information requirements shall be derived using the same equation at BEP evaluated for the C-value and according to Table 1. The second decimal place of the MEI shall be determined by a linear interpolation of the C-values corresponding to the neighbouring MEI values in Table 1, and by rounding to the next lower MEI. If the C-value is smaller than the one corresponding to a MEI of 0,70, only ‘MEI > 0,70’ shall be provided as information.

Table 1

Minimum efficiency index (MEI) and its corresponding C-value depending on the pump type and speed

9.

The maximum permissible random uncertainty er,max as a percentage of the arithmetically averaged value of the measured quantity is:

Table 2

Maximum permissible random uncertainty er,max

10.

The maximum permissible measurement device uncertainty es,max as a percentage of the arithmetically averaged value of the measured quantity is:

Table 3

Maximum permissible measurement device uncertainty es,max

11.

The maximum overall tolerance for measurements is ttot = 5 %. Measurement devices shall be chosen not to exceed this overall tolerance. Consequently, measured pump efficiencies for BEP, PL, and OL are not allowed to fall below the threshold value defined as follows:

12.

For the purpose of conformity assessment, the manufacturer shall prepare and keep available upon request from market surveillance authorities test reports and all documentation needed to support the information declared by the manufacturer. The test reports shall contain all relevant measurement information including but not limited to:

description of the test sequence followed (e.g. to arrive at equilibrium conditions as applicable).