Richter MNK Series - Manual (Page 14)

Series MNK 200-150-315
Page 14
9230-053-en Revision 12
TM 8195 Edition 03/2011
6 Commissioning/Shutdown
6.1 Initial commissioning
Normally, the pumps have already been test-run with
water. Unless special agreements have been made,
there could still be residual amounts of water in the
pump. This must be noted in view of a possible
reaction with the medium.
Long life grease and grease lubrication
A difference is made between long-life-grease
lubricated and regreasable rolling bearings.
If there are grease nipples on the bearing pedestal,
the rolling bearings must be regreased.
See Section 7.2.2.
If there are no grease nipples, the rolling bearings
have long-life grease lubrication. Regreasing is not
possible and not necessary. See Section 7.2.1.
Oil bath lubrication
Pour in oil into the bearing pedestal!
For procedure and the oil grade, see Sections 7.2
and 7.8.5.
6.1.1 Filling the pump housing
Check to see whether the screws on the suction
flange, discharge flange, housing flange and drain
flange are tightened.
When retightening the housing screws, make sure
that the support bracket is undone. Otherwise, the
pump could be deformed.
For screw tightening torques see Section 1.1.
Open the suction line fully so that the medium can
flow into the pump.
Open the discharge valve so that the air in the
pump can escape.
If air cannot be vented into the discharge line, e.g.
a drop in pressure in this line is not permitted,
venting must be performed upstream of the
discharge valve.
Monitor the venting operation until no air but only
liquid emerges.
Turn the pump shaft at the coupling several times.
Monitor the venting operation again until no more
air emerges.
Close the discharge valve again until only
the minimum flow rate is obtained after
the motor has been started.
6.1.2 Start-up
Check to see whether the pump shaft
can be readily turned by hand.
Check the direction of rotation of the
motor with the coupling disengaged or with a rotary
field instrument.
As viewed from the motor, the direction of rotation
of the pump is clockwise. See also the direction of
rotation arrow of the pump.
The pump must not run dry during the check
of the direction of rotation.
Check alignment of the coupling.
Mount coupling guard.
The pump must be completely filled with liquid.
The maximum admissible flow rate must not
be exceeded.
Otherwise the plain bearings can run dry in
both cases.
Switch the motor on.
Set the desired flow by opening the discharge valve.
When the motor is running but the pump is not
conveying, this means that the magnetic drive
has stopped.
Switch motor off immediately in order to prevent
overheating of the magnet assemblies.
Then proceeded as follows:
Close discharge valve down to the position
"minimum flow rate"
Start motor again.
If the magnetic drive stops again, look for the cause.
6.2 Operating limits
The operating limits of the pump/unit in terms
of pressure, temperature, power and speed
are entered in the data sheet and it is
imperative to observe them!
6.2.1 Abrasive media
If liquids with abrasive constituents are
conveyed, increased wear at the pump is to
be expected. The inspection intervals should
be reduced compared with the usual times.
6.2.2 Min./max. flow rate
The operating range generally recommended lies at
0.3 Q
opt
to 1.1 Q
opt
. Consult the manufacturer for
operation outside this range and observe Section
2.6.2.