Richter SCK-S - Manual (Page 7)

Series MNK-S, MNK-SB, SCK-S, “Self-priming“ design Page 7
9230-062-en Revision 02
TM 6566 Edition 08/2006
4 Installation
4.1 Safety requirements
Equipment which is operated in potentially explosive
areas must satisfy the explosion protection require-
ments.
It is imperative to observe the notes on safety con-
tained in the respective installation and operating
manual.
With magnetic drive pumps MNK-S, MNK-SB:
People with a pacemaker are at risk from the
strong magnetic field of the magnetic drive. It
could be life-threatening for them to stay at a
distance of less than 500 mm from the pump.
The following installation instructions are based on the
assumption that a shut-off valve is located down-
stream of the pump as a standard feature.
There are various different installation configurations.
4.1.1 Emptying of waste-water basins
As shown in the diagram, no additional valves are
required if it is always ensured that the pump is not
siphoned after it is switched off.
It is siphoned when the discharge line remains open
after the pump is switched off and the medium col-
umn on the discharge side can flow back through the
pump.
Here, too much medium is entrained out of the pump
housing and so the pump can no longer be primed
when started up again!
The siphoning of the pump can be prevented if,
after the end of conveyance, the shut-off valve on
the discharge side is closed first and then the pump
switched off.
It is recommended to switch off the pump before air
enters the suction line, i.e. the suction line end
should always lie at the low level of the medium.
4.1.2 Emptying with overflow
As the diagram shows, no additional valves are re-
quired for the pump for emptying with overflow.
The sequence of activation of the shut-off valve and
the start-up of the pump is arbitrary for the start-up
and shutdown operations.
5 Commissioning / Shutdown
The general commissioning/shutdown procedures are
already described in the installation and operating
manuals for pumps of the series MNK, MNK-B and
SCK. This relates, for example, to work on and in-
spections of the bearing pedestal, coupling and motor.
5.1 Initial commissioning
Normally, the pumps are subjected to a trial run with
water. Unless special agreements have been made,
residual amounts of water may still be in the pump.
This must be noted in view of a possible reaction with
the medium.
5.1.1 Filling the pump housing
Although the self-priming pump is able to vent its
suction line itself, the pump housing must, however,
be initially filled with at least 17 litres of liquid.
This amount of medium can be supplied to the pump
on initial commissioning by means of a separate
filling connection, e.g. a Richter 3-way sight glass
TSG, installed in the discharge nozzle directly above
the pump.