Series MNK pedestal group 4
Page
14
9230-003-en
Revision 19
TM 10458
Edition 06/2022
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 lubrication:
The rolling bearings are greased for life. Regreasing is
not possible and not necessary. For service lives, see
Section 7.2
.
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 instru-
ment.
♦
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 mag-
netic 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 "mini-
mum 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
are to be reduced compared with the usual
times.
