Richter MPB 25-25-115 - Manual (Page 17)

Series MPB, close-coupled design Page 17
9240-050-en Revision 05
TM 7345 Edition 10/2008
8 Faults
Faults may result from improper operation.
Such improper operation – even brief ones –
may cause serious damage to the unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) can
result from these improper operation; their occurrence
can only be prevented by adhering to the intended
use.
Should there be any uncertainty about the remedy to
be applied, please inquire at the in-house pump office
or at the pump manufacturer's.
No delivery :
Is the pump filled and vented?
Is the suction line open, vented, cleaned and
correctly laid?
Is the discharge line open, vented, cleaned and
correctly laid?
Is the geodetic head too high?
Is air being drawn in?
Has the magnetic drive stopped?
Flow rate too high :
Is the geodetic head too low?
Are the pipe or nozzle resistances too low?
Is the pump speed too high or the impeller
diameter too large?
Delivery pressure too high :
Is the speed too high or the impeller diameter too
large?
Is the density too high?
Flow rate too low :
Have the pump, suction line and discharge line
been completely vented, filled and cleaned?
Have any strainers installed been cleaned?
Are all shut-off devices open?
Is the geodetic head too high?
Is the NPSHA too low or the NPSHR too high?
Are the pipe resistances too high?
Is the viscosity too high?
Is the direction of rotation correct?
Is the speed too low or the impeller diameter too
small?
Are pump parts worn?
Gas in the medium?
Delivery pressure too high :
Is the speed too high or the impeller diameter
too large?
Is the density too high?
Motor consumes too much electricity :
Is the flow rate, density or viscosity too high?
Is the speed too high or the impeller diameter too
large?
Can the pump shaft be turned properly?
Pump does not run smoothly or creates
noises :
Are the rolling bearings of the motor damaged?
Are parts of the hydraulics damaged?
Is the flow rate too low or too high?
Is the impeller balanced?
Is the pump twisted?
Is there foreign matter in the pump?
Leak from the pump :
Are all screws tightened to the correct tightening
torque?
Were the sealing surfaces assembled in a clean
state?
Have approved gaskets been installed?