Richter RMA Series - Manual (Page 17)

Series RMA
Page 17
9475-050-en Revision 12
TM 7978 Edition 08/2010
7.4 Stand-by pumps
If a pump is on stand-by, it is to be started up from
time to time. Regularly turn the shaft by hand in the
direction of rotation.
This operation is to be performed more often for
pumps which are exposed to very strong vibrations
from the plant.
When dismantling the pump from the plant, drain it,
thoroughly clean it, seal with flange covers and store
in accordance with the instructions.
7.5 Notes on dismantling
All repair and maintenance work is to be
performed by skilled staff using appropriate tools
and original spare parts.
Is the necessary documentation available?
Has the pump been shut down, drained and
flushed in accordance with the regulations?
See also Section 6.3.
If no new assembly is performed immediately after
dismantling, the plastic and ceramic components
in particular must be stored carefully.
Dismantling can be checked using the sectional
drawing in Section 9 and the components
available.
7.5.1 Protective clothing
Even if the pump has been properly
evacuated and flushed, residue of the
medium may still remain in the pump, e.g.
between sealing surfaces or in the bearing seats or in
the can.
Plastic components may absorb medium which
gradually emerges from the material after flushing.
Proper protective clothing is to be worn.
Protective clothing is also to be worn even if only the
bearing pedestal is to be removed. Medium may
penetrated the lantern chamber through the can.
7.5.2 Magnetic fields
Caution! Strong magnetic fields
Risk during dismantling and in the vicinity of
magnetic drives as single parts.
Remove loose parts and other magnetisable metals
from the work bench. They could otherwise be
attracted: Risk of accident!
Place any tools needed at a safe distance.
Keep
electronic equipment and measuring
instruments at a distance. In cases of doubt consult
the equipment manufacturer.
Hold magnetic drives as single parts firmly or secure.
Otherwise they could be attracted, for example, by a
vice: Risk of accident!
People with an pacemaker
Keep torso at a minimum distance of 20"
(500 mm).
For safety's sake, a distance of 6" (150 mm) should
be observed for watches, electric data carriers, data
carriers with magnetic strips etc.
7.6 Dismantling
There are two possibilities for dismantling:
1. Dismantling the complete pump from the plant.
2. Dismantling the complete slide-in unit as the
pump housing can remain in the plant connected
to the piping.
If the coupling installed is a spacer-type coupling,
the motor can also remain in the plant.
Dismantling of the complete pump is described here.
Undo the support bracket 183 from the base
plate. The bearing pedestal and support bracket
are one component in bearing group 1. In bearing
group 2 the support bracket 183 is attached with
2 hex. screws 901/2 and contact discs 557/2 to
the bearing pedestal. 330.
If the housing 100 remains in the plant, leave the
housing gasket 401 in the centering to protect the
housing sealing surface.
7.6.1 Removing bearing pedestal
Deposit pump vertically on the workbench with
the suction nozzle facing downwards. For this
purpose, use a soft, clean and smooth base.
Undo screws 901/5 from the connection
bracket/bearing pedestal.
Remove bearing pedestal 330 from the centering
of the bracket 344. If necessary, use two levers.
To overcome the axial magnetic forces, pull the
bearing pedestal 330 upwards with a firm jerk.
Alternatively, the unit can be raised using a
crane. A thread is to be provided in the drive
shaft to accommodate a crane plug for this
purpose.
CAUTION! When pulling out the
bearing pedestal, the axial magnetic
forces (up to max. 400 N without
weight force) decrease abruptly after
being at maximum. Risk of accident!
The operating torque of the magnetic coupling
installed is specified on the type plate.