Series MNK-B,
size 25-25-100
Page 14
9230-056-en
Revision 14
TM 9542
Edition 06/2016
6.4 Restarting
When the pump is restarted, it must be ensured that
all the relative steps as described in
Section 6.1
are
repeated, depending on the progress of the shutdown
operation.
6.5 Improper operation and their
consequences (examples)
Inadmissible modes of operation, even for a
short time, can result in serious damage to the
unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these inadmissible modes of operation;
their occurrence can only be prevented by adhering to
the intended use.
Pump is started up without medium :
The plain bearings in the pump may be destroyed.
Other pump components may be destroyed due to
overheating.
Suction line not opened or not opened fully :
Pump is cavitating
– material damage to pump and
plain bearings
Pump does not attain the required delivery head or
flow rate.
Pump may be destroyed due to overheating.
Discharge valve closed too much:
Pump may be destroyed due to overheating.
Axial thrust too great.
Discharge valve opened too much:
Pump can cavitate. Particularly severe with an
empty discharge line.
Risk of pressure surge.
Possible damage to the plain bearings.
Magnetic drive may stop.
Motor may be overloaded.
Suction valve and discharge valve closed:
Destruction due to rapid overheating and sharp
rise in pressure.
Control of the pump with the suction valve
Cavitation
– the volume may only be regulated on
the discharge side.
Operation with magnetic drive stopped :
If no heat is dissipated, damage to the inner and
drive magnet assemblies may occur.
Overrun of the admissible gas content:
The flow may stop.
Switch
pump
and
vent
off
for
renewed
conveyance.
Make sure that the gas content is not exceeded, as
described in the intended use.
