SCHMITT MPN Series, Original Operating Manual

Page: 16 / 31

Operation
Take the following measures whenever the pump is shut
down:
Pump is Action
shut down Take measures appropriate for
the fluid
( → Tab. 5 Measures
depending on the behavior of
the pumped liquid, Page 16).
…emptied Close suction and pressure-side
fitting.
…dismounted Isolate the motor from its power
supply and secure it against
unauthorized switch-on.
…put into
storage Note measures for storage
( → 4.2 Storage, Page 10).
Tab. 4 Measures to be taken if the pump is shut down
Duration of shutdown (depending
on process) Behavior of the
pumped liquid
Short Long
Crystallized or
polymerized,
solids
sedimenting Flush the
pump. Flush the
pump.
Solidifying/
freezing,
non-corrosive Heat up or
empty the
pump and
containers. Empty the
pump and
containers.
Solidifying/
freezing,
corrosive Heat up or
empty the
pump and
containers. Empty the
pump and
containers.
Remains liquid,
non-corrosive
– –
Remains liquid,
corrosive
–
Empty the
pump and
containers.
Tab. 5 Measures depending on the behavior
of the pumped liquid
6.4 Restoring the pump to service
1. If the pump is shut down for over 1 year, replace elastomer
seals.
2. Complete all steps as for commissioning
( → 6.2 Commissioning, Page 15).
6.5 Operating the stand-by pump
Stand-by pump filled and bled
Operate the stand-by pump at least once a week.
1. Fully open the suction-side fitting.
2. Open pressure-side fitting far enough so that the stand-by
pump operating temperature is achieved and heating is
even
( → 6.2.1 Switching on, Page 15).
16 MPN 11333/0519