SAER Elettropompe MK Serie Manuel D'utilisation page 23

EN - Translation of the original instructions
CONNECTING THE PIPES
•
•
•
•
•
•
WARNING!
•
The suction inlet must be preceded by a straight section of pipe of length at least two times the diameter of the inlet itself.
The intake pipe must always be perfectly air tight and not positioned horizontally, but must always rise towards the pump in case of
suction operation. On the other hand, in the case of operation under water head, the intake pipe must always slope down towards the
pump. For this reason, any fitting cones 1 must be eccentric and oriented to avoid the formation of bubbles during priming or operation.
•
WARNING!
•
To adjust the flow rate, it is a good idea to install a shutter on the delivery pipe.
For over head installation, install a foot valve.
In any case, the diameter of the pipe must not be less than the diameter of the pump openings.
hermetic and for the catalogue data it must have the following minimum diameters.
DN
(pump suction) - mm
32
40
50
After having performed the controls listed, connect the pipelines to the pump.
PLANTS THAT ARE SUBJECT TO A RISK OF WATER HAMMER
The water hammer is a hydraulic phenomenon that occurs when a fluid, inside a conduit, undergoes a strong variation in speed (for
example as a result of sudden closure or opening of a valve).
The occurrence of water hammer causes a strong System overpressure which can severely damage the equipment (pump, motor,
valves, pipes, etc. ..).
Main precautions to be taken to avoid the water hammer:
- Avoid sudden and rapid maneuvers;
- Adopting progressive start and stop systems;
- Install a check valve directly at the pump outlet;
- Install vents that allow the removal of pressurized air bags at the appropriate positions;
- Install pressure relief valve (s);
- Install an upstream pressure relief surge anticipating control valve);
- Install expansion crates (tanks) when needed.
AUXILIARY CONNECTIONS
WARNING!
•
ELECTRICAL CONNECTIONS
•
•
•
•
Keep the manual for future reference - For more informations visit www.saerelettropompe.com
The pump maximum working pressure can't be bigger than the PN pump nominal pressure.
Pipes must be suitable for the pump maximum working pressure.
Le tubazioni non devono trasmettere alla pompa sforzi superiori a quelli ammessi
The intake and delivery pipes must not transmit forces to the pumps/ electric pump due to their own weight
and/or heat expansion, at the risk of possible liquid leaks or breaking the pump. For this reason, the pipes
must be supported by anchorages and, if necessary, expansion joints must be inserted in the appropriate
positions.
Pumps don't have to transmit vibrations to the pipes, therefore insert anti-vibration couplings both in suction
and delivery.
Install non return valve on the discharge side.
Install gate valve both in suction and discharge side.
In the first period of use the pipes release slags capable of damaging the seals of the pump: We recommend
cleaning of pipes, fittings, valves and so on before connecting the pump.
If necessary, insert a filter on the suction line: The filter must have a mesh less than 2 mm and a free
passage area of at least 3 times the area of the pipe section, in order to avoid excessive losses.
DN
(suction pipe) - mm
50
65
80
Verify the presence and proper installation of the necessary auxiliary connections.
The connection to the power grid must be done in the respect of the local and national standards of the
electric system of the place where the pump is installed.
Furthermore, respect the connection diagrams supplied with the motor and with the control panel.
Perform the earth connection before all the other connections.
Verify the correct operation of the electric equipment (control panel etc...).
DN
(pump suction) - mm
65
80
100
The suction piping must be absolutely
DN
(suction pipe) - mm
100
125
150
23