Speck Normblock Multi 65/250 - Page 33

Faults
04/2019 EN 33
Fault: Pump is loud
Possible cause Solution
Pump and pipes not
completely ventilated or
filled.

Ventilate pump.
 Fill pump.
Suction height too
large/Unit’s NPSH
(intake) too low.
 Correct the fluid level.
 Install pump lower.
 Completely open shut-off valve
in the intake.
 If the resistance is too large,
modify the intake
line.
 Check suction basket/suction
opening.
 Observe the permitted pressure
reduct
ion speed.
Wear of components.  Replace components.
Dynamic head lower than
that indicated in the
order.
 Set operating point exactly.
 For constant overload turn
the
impeller (further enquiry
required).
Pump strained or
vibrations in the pipes.
 Check pipe connections and
pump fasteners, if necessary
reduce the pipe bracket
spac
ing.
 Fasten pipes using
vibration
reducing materials.
Imbalanced rotor.  Clean pump and pump parts.
Pump and/or motor
bearings are damaged.
 Replace bearing.
Flow rate too low.  Increase minimum flow rate.