en – Translation of the Original Instructions
24 e-SV series – Additional Installation, Operation and Maintenance Instructions
5. 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.
6. 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, bends of a radius as wide as possible
• Without traps and 'goosenecks'
• With on-off valves with a low specific flow resistance.
7. Install a check valve on the discharge side to prevent the liquid from flowing back into the
pump unit when this is at standstill.
8. 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.
9. 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.
10.On the suction side, install a device to prevent the absence of liquid (float or probes), or a
minimum pressure device.
11.Sufficiently submerge the end of the suction pipe in the liquid, in order to prevent any air
from penetrating through the suction vortex when the level is at the minimum
12.In case of suction lift installation, the suction pipe must have an increasing slope towards
the unit exceeding 2%; to avoid air pockets; also install:
• A foot check valve that guarantees full opening (full section)
• A filling on-off valve to facilitate the removal of the air and priming.
4.4.2 Forces and torques applicable to the flanges
The table shows the maximum allowable forces and torques exerted by the piping on the
flanges of the unit.
Mz
Mx
My
Fy
Fz
Fx
y
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