Series RMA-B
close-coupled design
Page
14
9450-055-en
Revision 01
TM 9886
Edition 11/2018
6
Commissioning/Shutdown
6.1 Initial commissioning
Normally, the pumps have already been test-run with
water.
Unless special agreements have been reached, there
may still be some residual amounts of water in the
pump. This must be noted in view of a possible
reaction with the medium.
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 tightening the housing
screws, it must be ensured that the screw fitting
on the support bracket of the adapter and motor is
undone. Otherwise, the pump may be subjected to
tension.
For screw tightening torques see
Chapter 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
Chapter
2.6.2.
