▪ 2-pole operation: Q
max
10)
= 1.1 × Q
opt
9)
▪ 4-pole operation: Q
max
10)
= 1.25 × Q
opt
9)
▪ 6-pole operation: Q
max
10)
= 1.25 × Q
opt
9)
The data refer to water and water-like fluids. Longer operating periods with these
fluids and at the flow rates indicated will not cause an additional increase in the
temperatures on the pump surface. However, if the physical properties of the fluids
handled differ from those of water, the calculation formula below must be used to
check if an additional heat build-up may lead to a dangerous temperature increase at
the pump surface. If necessary, the minimum flow must be increased.
Table 16: Key
Symbol
Description Unit
c Specific heat capacity J/kg K
g Gravitational constant m/s²
H Pump discharge head m
T
f
Fluid temperature °C
T
O
Temperature at the casing surface °C
Pump efficiency at duty point -
Temperature difference K
6.2.3.2 Density of the fluid handled
The pump input power changes in proportion to the density of the fluid handled.
CAUTION
Impermissibly high density of the fluid handled
Motor overload!
▷ Observe the information on fluid density in the data sheet.
▷ Make sure the motor has sufficient power reserves.
6.2.3.3 Abrasive fluids
Do not exceed the maximum permissible solids content specified in the data sheet.
When the pump handles fluids containing abrasive substances, increased wear of the
hydraulic system and shaft seal are to be expected. In this case, reduce the commonly
recommended inspection intervals.
6.3 Shutdown/storage/preservation
6.3.1 Measures to be taken for shutdown
The pump (set) remains installed
✓ Sufficient fluid is supplied for the operation check run of the pump.
1. Start up the pump (set) regularly between once a month and once every three
months for approximately five minutes during prolonged shutdown periods.
This will prevent the formation of deposits within the pump and the pump
intake area.
10)
Maximum permissible flow rate
6 Commissioning/Start-up/Shutdown
MegaCPK
41 of 74
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