Publicité
Localized restrictions should be avoided
along the run of the duct, as these can cause
load losses resulting in cavitation. Avoid 90°
elbow bends, connections with other piping,
constrictions, counterslopes, inverted U- curves and
T-connections.
2. The layout must be designed with the aim of preventing
cavitation.
3. Ensure the line perfectly hermetic and constructed so it
remains perfectly airtight over time.
4. Ensure that the suction line will not empty, even partially,
when the pump is stopped.
5. Do not use 3 or 4-way hydraulic fittings, adapters, swivel
joints, etc. as they could jeopardies pump performance
due to excessive head losses.
6. Do not use foot valves or other types of unidirectional
valves.
7. Do not recirculate the bypass valve outlet directly into the
suction line.
8. Provide for proper guards inside the tank to prevent that
bentonite flow from the bypass and the tank supply line
can create vortexes or turbulence near the pump supply
pipe port.
9. Make sure the suction line is thoroughly clean inside
before connecting it to the pump.
9.7
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.
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 from the other parts of the
installation.
3. Use high pressure pipes and fittings to ensure high safety
margins in all operating conditions.
4. Use pressure gauges able to withstand the pulsating loads
typical of plunger pumps.
5. During the design stage take account of outlet line
pressure drops, resulting in lower pressure at the supplied
service than the pressure measured at the pump.
6. 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.
9.8
Typical Diagram
500
450
400
350
300
250
200
150
100
50
0
0
50
100
9.9
V-belt transmission
The pump can be controlled by a V-belt system.
For this pump model, we recommend use of 2 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. 7, in relation to the
number of rpm normally declared by the manufacturer.
Minimum duct pulley diameter (on pump shaft): ≥ 160 mm.
The radial load on the shaft must not exceed 3000 N
(value necessary for Layout definition). The transmission is
considered adequate if the load is applied to a maximum
distance a=30 mm from the shaft shoulder (P.T.O) as shown in
Fig. 10.
For dimensions differing from those specified
above, contact our Technical or Customer Service
Departments.
25
val. min.
Val. max
150
200
250
300
RPM
Fig. 6
350
Publicité
