Grundfos SCALA Instructions Manual page 5

3.3.7 Suction from a well
1
5
6
Fig. 6 Suction from a well
Pos. Description
1 Highest tapping point
2 Isolating valve
3 Flexible hoses
4 Pipe support
Inlet filter.
If the water may contain sand, gravel or other debris,
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please install a filter on the inlet side to protect the pump
and installation.
6 Foot valve with strainer (recommended).
H1 Maximum suction lift is 8 m (26 ft).
H2 Inlet pipe must be submersed at least 0.5 m (1.64 ft).
3.3.8 Suction from freshwater tank
A
7
8
Fig. 7 Suction from freshwater tank
Pos. Description
1 Highest tapping point
2 Pipe hangers
3 Isolating valve
4 Flexible hoses
5 Drain to sewer
Inlet filter.
If the water may contain sand, gravel or other debris,
6
please install a filter on the inlet side to protect the pump
and installation.
7 Freshwater tank
2
3
4
1
2
3 4
5
6
Pos. Description
8 Foot valve with strainer (recommended)
A Minimum 1 ° inclination
3.3.9 Inlet pipe length
The overview below shows the different possible inlet pipe
lengths, depending on the vertical pipe length.
The overview is only intended as a guide.
L
Fig. 8 Inlet pipe length
DN 32
H L
[m (ft)] [m (ft)]
0 (0) 68 (223)
3 (10) 43 (141)
6 (20) 17 (56)
7 (23) 9 (30)
8 (26) 0 (0)
Preconditions:
Maximum flow velocity: 1 l/s (16 gpm).
Inside roughness of pipes: 0.01 mm (0.0004 inch).
Inside pipe diameter
Size
[mm (inches)]
DN 32 28 (1.1)
DN 40 35.2 (1.4)
DN 40
H L
[m (ft)] [m (ft)]
0 (0) 207 (679)
3 (10) 129 (423)
6 (20) 52 (171)
7 (23) 26 (85)
8 (26) 0 (0)
Pressure loss
[m/m (psi/ft)]
0.117 (5/100)
0.0387 (1.6/100)
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