Hydraulic Connections; Pump Supply; Suction Line; Outlet Line - Pratissoli MK29M Serie Manual De Uso Y Mantenimiento

RH SIDE
2
1
3
4
5
The position of the reduction unit can only be
changed by authorized specialized personnel
meticulously following the instructions in the
repair manual.
9.4

Hydraulic connections

In order to isolate the system from vibrations produced by
the pump, it is advisable to make the first section of the duct
adjacent to the pump (both suction and outlet) with flexible
piping. The suction hose must be sufficiently rigid to prevent
deformation due to the negative pressure exerted by the
action of the pump.
9.5

Pump supply

A positive head of at least 0.20 meters is recommended for
the best volumetric efficiency, to be increased with increasing
fluid density.
For the priming conditions see the chart in par.
9.8.
9.6

Suction line

For smooth operation of the pump, the suction line must have
the following characteristics:
1. Minimum internal diameter for pipes of length less than 8
m. Ø 90 mm.
The pipe must be rigid enough to avoid self-constriction
caused by the pressure drop.
Localized restrictions should be avoided along the
piping, as these can cause pressure drops resulting
in cavitation. Avoid 90° elbows, connections with
other piping, restrictions, reverse gradients, inverted
U-curves and Tee connections.
2. The layout must be such as to prevent cavitation
problems.
3. Completely airtight and constructed to ensure a perfectly
hermetic seal through time.
4. Prevent the pump from emptying when it is stopped,
including partial emptying.
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. Avoid use of foot valves or other types of unidirectional
valves.
7. Do not recirculate the by-pass valve drain directly to the
3
8. Provide for proper guards inside the tank to prevent that
4
9. Make sure the suction line is thoroughly clean inside
9.7
5
For correct design of the outlet line comply with the following
installation prescriptions:
1. The internal diameter of the pipe must be sufficient to
2. The first section of the line connected to the pump outlet
LH SIDE
2
3. Use high pressure pipes and fittings to ensure high safety
4. Use pressure gauges capable of withstanding the
1
5. During the design stage, keep in mind the line pressure
6. For those applications where pulses produced by the
Fig. 6
9.8
For MK29M5B and MK29M8B pumps refer to Fig. 7.
For MK29M5D and MK29M8D pumps refer to Fig. 7/a.
9.9
As indicated in par. 9.1 in exceptional cases only, the pump
can be controlled by a V-belt system.
For proper layout sizing, consult with our Technical or
Customer Service Departments.
24
suction line.
bentonite flow from the bypass and the tank supply line
can create vortexes or turbulence near the pump supply
pipe port.
before connecting it to the pump.

Outlet line

ensure correct fluid velocity.
must be a flexible hose, in order to isolate vibration
produced by the pump from the rest of the system.
margins in all operating conditions.
pulsating loads typical of plunger pumps.
drops that lead to a pressure reduction at the user with
respect to the pressure measured on the pump.
pump on the outlet line may prove harmful or unwanted,
install a pulsation dampener of sufficient size.

Typical Diagram

450
400
350
300
250
200
150
100
50
0
0 50 100 150
RPM

V-belt transmission

val. min.
Val. max
200 250 300 350
Fig. 7
Fig. 7/a