Richter MNK-B Series - Manual (Page 14)

Series MNK-B, close-coupled design Page 14
9230-055-en Revision 09
TM 7345 Edition 10/2008
These measures are not necessary with pumps with a
conductive plastic lining.
If the pump is returned to the manufacturer's, clean
the pump very thoroughly.
See also Section 3.1.
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 operations 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.
Operation with magnetic drive stopped:
If no heat is dissipated, damage to the inner and
drive magnet assemblies may occur.
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.
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.
7 Maintenance
7.1 Screw connections of the
housing
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
housing flange
suction flange
discharge flange
See also Section 6.1.1, para. 1.
Other inspections are to be performed regularly,
depending on the operating requirements.
7.2 Motor
The operating manual of the motor manufacturer must
be observed.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
Observe the ATEX notes of the motor manufacturer.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
The ingress of water into the bearing pedestal will
substantially impair bearing lubrication.