Series MNKA bearing pedestal assembly 4
Page 14
9250-003-en
Revision 01
TM 10458
Published 06/2022
6
Commissioning/shutdown
6.1 First commissioning
Normally, the pumps have already been test-run
with water. Unless special agreements have
been made, there could still be small amounts of
residual water in the pump. This must be noted in
view of a possible reaction with the medium.
Long-life grease and grease lubrication:
A distinction is made between rolling bearings that
have long-life grease and those that can be relu-
bricated.
♦
If there are lubricating nipples on the bearing
pedestal, the rolling bearings must be
relubricated.
See
section 7.2.2
.
♦
Where no lubricating nipples are present, the
rolling bearings are permanently greased. Re-
lubrication
is
not
possible
and
not
necessary. See
section 7.2.1
.
♦
The rolling bearings have long-life grease.
Relubrication is not possible and not
necessary. For service life, see
section 7.2
.
Oil bath lubrication:
Fill the bearing pedestal with oil!
For oil type and oil filling, see
sections 7.2
and
7.8.5
.
6.1.1 Filling the pump housing
♦
Check to see whether the screws on the suc-
tion flange, discharge flange, housing flange
and drain flange are tight.
When retightening the housing screws, make
sure that the support bracket is released.
Otherwise, the pump could be put under strain.
For screw tightening torques, see
section1.1
.
♦
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,
because a pressure drop in this line is not per-
mitted, for example, venting must be
performed upstream of the discharge valve.
♦
Monitor the venting process until no air but only
liquid emerges.
♦
Turn the drive shaft at the coupling a few times.
♦
Monitor the venting process again until no more
air emerges.
♦
Close the discharge valve again to
allow only the minimum flow rate
after the motor has been started.
6.1.2 Startup
♦
Check that the drive shaft can be
turned easily by hand.
♦
Check the direction of rotation of the motor with
the coupling disengaged or using a rotary field
instrument.
♦
Viewed from the motor, the direction of rotation
of the pump is clockwise. See also the
direc-
tion of rotation arrow
on the pump.
The pump must not run dry during the
direction of rotation check.
♦
Check the alignment of the coupling.
♦
Install a 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 on the motor.
Set the required flow by opening the discharge
valve.
If the motor runs but the pump does not
convey,
this
means
that
the
magnetic coupling has ruptured.
♦
Switch off the motor immediately to prevent
overheating the magnetic rotor.
Then proceed as follows:
♦
Close the discharge valve to the “minimum flow
rate” position.
♦
Restart the motor.
If the magnetic coupling ruptures 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. In such cases, the
inspection intervals should be reduced
compared to the usual times.
6.2.2 Minimum/maximum flow rate
The generally recommended operating range lies
between 0.3 Q
opt
to 1.1 Q
opt
. Consult the
manufacturer for operation outside this range
and
observe
section 2.6.2
.
