POMPE CUCCHI MX Series, Руководство по эксплуатации и техническому обслуживанию

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Pompa ad Ingranaggi - Serie MX
Gear Pump - MX Series
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At every start, check the mechanical seal, that must not have any loss, check the right operation
of thermal sensors and of alarm and stop devices.
Verify that in no case the rotation speed ex-
ceed 1750 rpm (that is the rotation speed of a 4 poles motor at 60 Hz).
At every start, check the packing ring, if any. We remind you that during normal operation a little
leakage must occur (few drops for minute). Tighten the screws of the stuffing box, if necessary,
and/or replace the packing rings.
Even when the check of the temperature is not mandatory, every half an hour during the commis-
sioning and, then, every hour during normal operation, record both the surface temperatures
near the bushings and the mechanical seal and the electric absorption of the motor. Shut off the
pump as soon as a sudden change happens on the outline of the curve of the recorded values.
Check also that the ambient temperature and the fluid temperature remain in the range indicated
at pag.
69 .
In case double mechanical seals (in tandem or in back to back arrangement) are installed, it is a Cus-
tomer’s charge to provide for their flushing w ith a fluid compatible with the pumped liquid.
In back to back arrangement, flushing must be done at a higher pressure level than the process fluid,
while in tandem arrangement the outer mechanical seal must be flushed by a pressureless fluid (or
with a pressure level lower than the process fluid).
Maintenance
A correct and frequent maintenance is the basis for a right operation of the pump.
Maintenance must be done, whenever possible, in unclassified zones, or with no-sparking equip-
ments and tools (see UNI EN 11271
– Annex 2).
Apart from carefully following the instructions supplied by the Manufacturers of the electric mo-
tor, of the speed reducer or hydraulic speed variator, the following operations of routine mainte-
nance must be carried out:
-
daily (or at every start up) check there are not losses of liquid from the static seals of the pump and
of the valve;
-
daily (or at every start up) check the tightness of the mechanical seal or of the stuffing box;
- monthly check the wear rate of the radial ball bearing;
-
every 2 months check the wear rate on the packing rings;
-
every 3 months check the wear rate of the supporting bushes and the gap between the gears and
the body;
-
every 4 months replace the packing rings;
- every 6 months check the wear rate of the flexible joint;
-
every 6 months check the wear rate of the gears;
-
every 24 months change the radial ball bearing;
-
every 24 months change the supporting bushes;
-
every 24 months change all the gaskets.
Routine maintenance must be supported by extra maintenance to be done every time one detects
there is something wrong with the pump (e.g. vibrations, overheating, too large clearances, loss of
efficien
cy,…).
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