English (GB)
23
Example
Pb = 1 bar.
Pump type: CR 15, 50 Hz.
Flow rate: 15 m
3
/h.
NPSH (from page 24): 1.1 m head.
Hf = 3.0 m head.
Liquid temperature: +60 °C.
Hv (from Fig. E on page 28): 2.1 m head.
H = Pb x 10.2 - NPSH - Hf - Hv - Hs
[m head].
H = 1 x 10.2 - 1.1 - 3.0 - 2.1 - 0.5 = 3.5 m head.
This means that the pump can operate at a suction
lift of maximum 3.5 m head.
Pressure in bar: 3.5 x 0.0981 = 0.343 bar.
Pressure in kPa: 3.5 x 9.81 = 34.3 kPa.
9.1.5 Maximum permissible inlet pressure
The table on page 25 states the maximum
permissible inlet pressure for vertically mounted
pumps. However, the actual inlet pressure + the
maximum pump pressure at no flow must always be
lower than the maximum permissible system
pressure which is stated on the pump nameplate. For
identification of the nameplate data, see section
5.1.1 Nameplate.
The pumps are pressure-tested at a pressure of 1.5
times the maximum permissible system pressure.
9.1.6 Minimum flow rate
Due to the risk of overheating, do not use the pump
at flows below the minimum flow rate.
The curves below show the minimum flow rate as a
percentage of the rated flow rate in relation to the
liquid temperature.
- - - - = air-cooled top.
Fig. 29 Minimum flow rate in percentage of
nominal flow
9.1.7 Frequency of starts and stops
See the instructions for the motor which are supplied
with the pump.
9.2 Dimensions and weights
Dimensions: see page 26.
Weights: see label on the packing.
9.3 Electrical data
See the motor nameplate.
9.4 Sound pressure level
See page 27.
10. Disposing of the product
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
See also end-of-life information at
www.grundfos.com/product-recycling.
WARNING
Too high pressure and leakage
Death or serious personal injury
- Do not run the pump against a closed
outlet valve.
TM01 2816 2302
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