Dry Operation - Sanremo MILANO S Instruction Booklet

ENGLISH
MILANO S
Warning for correct use of rotary pumps
1- PROPER ALIGNMENT OF PUMP AND MOTOR
On occasion the noise of a motor-pump assembly is caused by a poor
alignment.
When the coupling between motor and pump is rigid, the pump rotor and the
motor rotor may be out of axis. If this condition is maintained over time the most
likely damage is seizure of the pump.
An efficient solution of this problem is the use of an elastic coupling between
pump and motor. Fluid-o Tech supplies an optional kit code N. 10051020
2- QUALITY OF WATER.
Tight mechanical tolerances of components and materials used for rotary vane
pumps require a very clean water, free from suspended particles. Sand, deposits
on connecting pipes or the resins of the sweetener, when flowing through the
pump, may scratch graphite parts causing problems of insufficient pressure and
flow rate.
If a closed loop hydraulic circuit is not available to guarantee a clean water and
no sources of contamination Fluid-o-Tech recommend to install a 5-10 micron
filter between the sweetener and the pump.
Recommended filter: food approved polipropilene wire cartridge.
Keep the filter clean.: an upstream dirty filter will create cavitation and the pump
will break shortly (see section 4).

3- DRY OPERATION

Rotary vane pumps may operate in dry condition only for a very short time- few
seconds!
Without a proper water cooling the temperature of the mechanical seal will
increase very quickly with resulting breakage. The most likely impact is a
remarkable leak visible from the four drain holes close to the motor clamp .
For potential lack of feed from city water line Fluid-o-Tech recom- mend the
installation of a minimum pressure safety switch upstream from the pump.
In case of feed from a tank install on the tank a minimum level switch.
4- CAVITATION
Cavitation shows when feed flow rate does not match the pump design
requirement: most fre- quent causes are dirty filters, small diameter pipes, more
users on the same line.
Opening of the safety valve (generally installed upstream from pump and filter)
26