Pratissoli MW Serie Manuel D'utilisation Et D'entretien page 52

9. Provide for proper guards inside the tank to prevent that
water flow from the bypass and the tank supply line can
create vortexes or turbulence near the pump supply pipe
port.
9.7 Filtration
Two filters must be installed on the pump suction line, positioned as indicated in Fig. 7 and Fig. 7/a.
With a manually activated control valve
Inlet
Supply tank
With a pneumatically activated control valve
Inlet
Supply tank
The filter must be installed as close as possible to the pump,
it must be easily inspected and must have the following
characteristics:
1. Minimum flow rate at least 3 times the nominal flow rate
of the pump.
2. Inlet/outlet port diameters no smaller than the inlet port
diameter of the pump.
3. Filtration grade between 200 and 360 µm.
For smooth pump operation, regular filter
cleaning is necessary, planned according to the
actual use of the pump in relation to the quality
of water used and actual clogging conditions.
10. Make sure the suction line is thoroughly clean inside
before connecting it to the pump.
11. Install the pressure gauge for checking the booster
pressure near the plunger pump suction port and again
downstream from the filters.
1 Filter 1
2 Booster Pump
3 Filter 2
4 Pressure gauge
5 Pressure switch
6 Plunger pump
Bypass
1 Filter 1 5 Pressure switch
2 Booster Pump 6 Plunger pump
3 Filter 2 7 Pressure gauge
4 Pressure gauge 8 Safety valve
Bypass
9.8
For the correct laying of the outlet line, the following
installation rules must be followed:
1. The internal diameter of the pipe must be sufficient to
ensure correct fluid velocity, see graph in par. 9.9.
2. The first section of the line connected to the pump outlet
must be a flexible hose, in order to isolate the vibrations
produced by the pump of the rest of the system.
3. Use high pressure pipes and fittings to ensure high safety
margins in all operating conditions.
4. The outlet line must always be provided with a safety
valve.
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7 Pressure gauge
8 Safety valve
9 Accumulator
10 Control valve
9 Accumulator
10 Pneumatic control
valve
Outlet line
Fig. 7
Fig. 7/a