Medium-consistency pump MC
STANDARD, C-01-000000
Rev. 0, 2010.02.09 START-UP Kap.5 , Seite 4 of 8
GRZ-2698571-v1-Startup.FM
First trial run Functioning of the pump must be monitored carefully during the first few
hours in operation.
Particular attention must be paid to the following:
• temperature of the shaft seal
• required amount of sealing water to the shaft seal
• bearing temperature and vibration
• pressure and flow rate in the pump
After start-up, the medium-consistency pump is handed over to the mill
operator in a complete, reliable condition and ready for operation.
The MC pump is designed for an operation against a closed slide. An
automatic switch-off after 600s operation on closed slide has to be
implemented.
Configuration of
the DIFFEREN
-
TIAL PRESSURE
TRANSMITTER
First of all, check Control direction (direct or indirect rel.) Direct is OK.
I. Check plausibility of differential pressure transmitter:
1. Pump is filled with water; sealing water ON.
The differential pressure must be about 0 bar (+/- 0,05 bar). Any other
value is proof of an error in calibration, control or wiring.
Set value:
0,2 bar --> valve must open
-0,2 bar --> valve must close
II
II. Check plausibility of differential pressure transmitter:
2. The pump is operated at 1500 rpm with closed valve. (Q=0)
The differential pressure should now be at about 0,8 bar.
(Parameters: medium:water, closed degassing)
CAUTION
If there are any unusual noises, it is essential to look for the cause
without delay and then eliminate the problem!
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