Warning - Correct Use Of Rotary Pumps - Sanremo ZOE COMPACT SAP Livret D'instructions

ENGLISH
Warning – 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 suspen-
ded 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 recom-
mend 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 recommend 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 frequent 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) must happen
before the pump start up. This will avoid cavitation. For the same reason closing of the safety valve must be delayed after the pump
shut down.
The most noticeable effect is an increase of noise. If cavitation continues the impact is the same as of dry operation.
5-Back Feed of Hot Water
If a non return valve between the pump and the hot water vessel is defective the pump may come in contact with hot water(90-
100°C). Dimensional variations of components will cause seizure of the pump.
6) Wrong connections
Pumps connectors are 3/8"NPT(conical) or 3/8" GAS(cylindrical).
Connectors with thread different from the recommended type are occasionally used. Sealing is made with a glue or with teflon tape.
If the connector is forced it is possible to create beards; if excess sealing glue is used the extra quantity of glue may enter into the
pump body.
In both cases it is likely to create a damage.
7) Pressure strokes
To avoid pressure strokes opening of solenoid valves installed downstream must happen before the start of the pump. For the same
reason closing of the valve must be delayed after stopping of the pump.
A pressure stroke may break graphite parts and damage mechanical seal causing blockage of the pump and leaks.
8) Handling
A crash on the floor may create deformations that will jeopardize the tight mechanical tolerances of the pump components. For the
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