Richter MNK Series - Manual (Page 15)

Series MNK 200-150-315
Page 15
9230-053-en Revision 12
TM 8195 Edition 03/2011
6.3 Shutdown
Close discharge valve down to the position
"minimum flow rate"
Switch motor off.
Close discharge valve completely.
Only close the suction line if the pump is to
be evacuated or dismantled.
For all work on the machine, make sure that
the motor cannot be inadvertently switched
on.
If the pump is to be evacuated or flushed,
observe the local regulations.
If the pump has been operated with a chargeable
liquid, it must be filled with inert gas (e.g. nitrogen) to
prevent an explosive atmosphere.
It is recommended to wait one hour before the pump
is dismantled from the plant to permit static peak
charges to be eliminated.
It is recommended to wait one hour before the pump
is dismantled from the plant to permit static peak
charges to be eliminated.
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)
Improper operation, even for brief periods,
may 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)
can 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 bearing 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 opened too much :
Pump may be destroyed due to overheating.
Axial thrust too great.
Discharge valve closed 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