Richter MNK-B Series - Manual (Page 15)

Series MNK-B, close-coupled design Page 15
9230-055-en Revision 09
TM 7345 Edition 10/2008
7.4 Stand-by pumps
If a pump is on stand-by, it is to be started up from
time to time.
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 taken out of operation,
evacuated and flushed correctly? 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.
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 or the can insert.
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 artificial pacemaker
Keep torso at a minimum distance of
500 mm.
For safety's sake, a distance of 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.
Dismantling of the complete pump is described here.
Undo screwing 902/2, 920/3 and 554/5 from
transition ring / lantern.
Pull motor 800/1 with transition ring 820 and also
hollow drive shaft 216 and inner magnet assembly
859 out of the slide-in unit.
Caution! Magnetic forces!
Risk of accident !
Axial forces are produced when the plain bearing
pedestal is pulled out of the bearing pedestal. These
forces diminish again abruptly after it has been
removed.
The operating torque of the magnetic coupling
installed is specified on the type plate.
Undo housing screws 901/3, 552/3.
Remove entire slide-in unit.
If the housing remains in the plant, leave the
housing gasket in the centering to protect the
housing sealing surface.
7.6.1 Dismantling the slide-in unit
Secure slide-in unit on the work bench or a work
top.
Pull the plain bearing pedestal 339 out of the
bearing pedestal.
Caution! Magnetic forces!
Risk of accident !
If necessary loosen the centering of the plain
bearing pedestal using a rust dissolver and levers.
It is imperative to use clamping jaws with a
rubber surface.
Clamp the plain bearing pedestal 339 with the
sealing surfaces in a vice.
Undo the impeller 230 and inner magnet assembly
859 with a strap wrench. Right-hand thread !
Pull parts out of the plain bearing pedestal 339 or
off the pump shaft 211.