- Installation and application - 36
8.6 PUMP STANDSTILL (STAND-BY)
During periods of pump standstill, only one shut-off valve may be closed, preferably
the discharge valve. When the suction and discharge valves are closed at the same
time, the pressure of the trapped cold liquid in the pump will increase rapidly. As the
liquid warms up to an unacceptable high value, it can very quickly damage the pump.
The pump shaft should be rotated once a day to avoid the shaft seal sticking to the
shaft.
If there is oil contamination during standstill of the pump, the oil must be drained before re-
starting the pump. Otherwise, a malfunction may occur which can lead to pump failure, which
may lead to the failure of the pump.
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