en – Original instructions
22
e-IXP(A), e-IXPC(A), e-IXPF(A) – Additional Installation, Operation and Maintenance Manual
4.3.2
Guidelines for the hydraulic system
1.
Support the piping system independently to prevent them from weighing on the unit.
2.
Remove any welding residues, deposits and impurities from the piping system in order to
avoid damage to the unit: the method and duration of the cleaning operation must be
adapted to the materials of the unit and the gaskets.
3.
To reduce the transmission of vibrations between the unit and the system and vice versa,
install:
•
Anti-vibration joints on the suction and discharge sides of the unit
•
Dampers between the unit and the surface on which it is installed.
4.
In order to reduce flow resistance, the pipe on the suction side must be:
•
As short and as straight as possible
•
For the section connected to the unit, straight and without bottlenecks, covering a
length equal to at least six times the diameter of the suction port
•
Wider than the suction port; if necessary, install an eccentric reducer that is horizontal on
top
•
Without bends; if this cannot be avoided, make sure that the radius of the bends is as
wide as possible
•
Without traps and 'goosenecks'
•
With valves with a low specific flow resistance.
5.
Install a check valve on the discharge side to prevent the liquid from flowing back into the
pump unit when this is at standstill.
6.
Install a diaphragm tank or flywheel to prevent water hammer.
7.
Install a pressure gauge (or a vacuum pressure gauge, in case of suction lift installation) on
the suction side, and a pressure gauge on the discharge side, for checking the actual
operating pressure of the pump unit.
8.
To exclude the unit from the system for the purpose of maintenance, install:
•
An on-off valve on the suction side
•
An on-off valve on the discharge side, downstream the check valve and pressure gauge,
also useful for regulating the flow rate.
9.
In case of suction lift installation, the suction pipe must have an increasing slope towards
the unit exceeding 2%; to avoid air pockets.
4.3.3
Forces and torques applied to the ports
The figure and the table show the maximum forces and torques that the piping system should
be allowed to apply on the ports of the unit, depending on the material, with temperatures up
to 180°C (356°F).
XI
P_M0
00
7_A_sc
F
y
F
x
M
x
M
y
M
z
F
z
F
x
F
y
F
z
F
z
F
x
F
y
