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9.8
Outlet line
For correct design of the outlet line comply with the following
installation prescriptions:
1. The internal diameter of the pipe must be sufficient to
ensure correct fluid velocity, see the 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 vibration
produced by the pump from 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 Max.
pressure valve.
5. Use pressure gauges capable of withstanding the
pulsating loads typical of plunger pumps.
6. During the design stage, keep in mind the line pressure
drops that lead to a pressure reduction at the user with
respect to the pressure measured on the pump.
7. For those applications where pulses produced by the
pump on the outlet line may prove harmful or unwanted,
install a pulsation dampener of sufficient size.
9.9
Calculation of the internal diameter of the
duct pipes
To determine the internal diameter of the duct, refer to the
following diagram:
Suction duct
With a flow rate of ~ 170 l/min and a water velocity of 0.5 m/
sec. The graph line joining the two scales meets the central
scale showing the diameters, corresponding to a value of ~ 80
mm.
Outlet duct
With a flow rate of ~ 170 l/min and a water velocity of 5.5 m/
sec. The graph line joining the two scales meets the central
scale showing the diameters, corresponding to a value of ~ 30
mm.
Optimal speeds:
-
Suction:
≤ 0.5 m/sec.
-
Outlet:
≤ 5.5 m/sec.
The graph does not take into account pipe
resistance, valves, load loss produced by the length
of the ducts, the viscosity of the liquid pumped or
the temperature itself.
If necessary, contact our Technical Office or
Customer Service Department.
9.10
V-belt transmission
The pump can be controlled by a V-belt system.
For this pump model, we recommend to use No. 4 XPB belts
(16.5x13 serrated). Use an XPC profile only for long durations.
Both the characteristics and transmissible power of each
belt can be verified in the diagram in Fig. 8, in relation to the
number of rpm normally declared by the manufacturer.
Minimum duct pulley diameter (on pump shaft): ≥ 250 mm.
The radial load on the shaft must not exceed 7500 N
(value necessary for Layout definition). The transmission is
considered adequate if the load is applied to a maximum
distance a=40 mm from the shaft shoulder (P.T.O) as shown in
Fig. 11.
For dimensions differing from those specified
above, contact our Technical or Customer Service
Department.
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