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6 TEMPORARY SHUTDOWN
PAGE
6.0
Date Name Signed Revision: 4
issued 04.11.97 Mangel Substitute for issue
approved 05.11.97 Denk of 09.12.94
released 06.11.97 Hantschk
text no. 30100
copy to: 95
6 Temporary Shutdown
■ After stopping the pump empty and if necessary rinse it if
– the medium might freeze due to the temperature surrounding
the pump. Especially where there is a danger of frost if the pump
is installed outside a building
– the medium tends to solidify or harden
– the medium tends to glue up the shaft seal.
■ Stator:
When stored for a long period, the elastomer along the contact
line between the rotor and stator may become permanently
distorted (compression-set).
This will increase the break away torque. For this reason, the stator
should be removed (please observe Section 9!), and stored in a cool,
dry place in air tight package to give protection against light and air.
■ Rotor:
Remove ceramic rotors (please observe Section 10!) and store away,
safe in the original packing.
Support other rotors on wooden blocks and cover to protect them
from mechanical damage, after the stator has been removed.
Rotors made of RCC (material number 1.2436):
Protect the rotor surfaces against corrosion with protective grease.
Remove the grease before re–installing the stator and
clean the rotor thoroughly in order to avoid unsuitability of
the grease with the pumping medium or the stator material.
■ Stand-by pump:
A stand-by pump is sometimes used as a back-up for the main
pump and, when standing idle for longer periods, should be
operated from time to time. The pump may otherwise become
seized when being started up. This is due to compression set
i.e. distortion of the stator against the surface of the rotor.
GB
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