8.1 Explanation of faults
The example illustrated in the diagram serves to facilitate understanding of the
causes of faults/malfunctions and their remedies described in the Trouble-shooting
section.
Many operating faults/malfunctions on pumps are caused by hydraulic phenomena.
The hydraulic behaviour of a pump is illustrated by its characteristic curves H, P, Eta
and NPSH in combination with the system characteristic curves H
A
and NPSH
A
as a
function of flow rate Q. The operating point B is given by the intersection between
the system curve H
A
and the pump's characteristic curve H.
If the cause of a fault or malfunction is unclear, consult your nearest KSB service
centre.
Fig. 34: Adjusting to the duty point
P
Pump power output H
A
System curve
B Operating point H
v
Hydraulic losses (system)
H Head NPSH Required inlet pressure
Eta Efficiency NPSH
A
Inlet pressure available in the system
Q Flow rate H
geo
Static head
8 Trouble-shooting
Omega / Omega V
73 of 94
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