Suction Lift - Grundfos CM 1 Manual De Instrucciones

6.2.1 Pipe connection (non-self-priming pumps)
Take care not to damage the pump
when connecting the suction and
discharge pipes.
Caution
Tightening torque: 50-60 Nm.
The stated torque must not be
exceeded.
Discharge port
Fig. 3 Suction and discharge ports
6.2.2 Pipe connection (self-priming pumps)
The pump must be installed correctly to ensure that it
can self-prime.
The following precautions must be taken:
See fig. 4.
• The minimum height from the centre of the
suction port to the first tapping point (H
observed.
If a pressure manager is installed in the system,
H is the height from the centre of the pump
1
suction port to the pressure manager.
Minimum heights appear from the table below.
• The suction pipe must be at least 0.5 metres
below the liquid level (H
For optimum suction capability, the
pump should be located near the well
or tank to ensure that the suction pipe
Note
is as short as possible. This will
reduces the self-priming time,
especially in the case of a high suction
lift.
Suction port
) must be
1
).
3
We recommend to install a filling plug in the
discharge pipe. This facilitates liquid filling before
start-up. See fig. 4, pos. A.
A
Fig. 4 Recommended piping for a self-priming
pump

Suction lift

(H )
2
[m]
4
5
6
7
8
H
1
H
1
H
2
H
3
Minimum height
(H )
1
[m]
0.2
0.35
0.5
0.6
0.7
11