Grundfos SCALA Series - Page 5

English (GB)
5
3.3.7 Suction from a well
Fig. 6 Suction from a well
3.3.8 Suction from freshwater tank
Fig. 7 Suction from freshwater tank
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.
Fig. 8 Inlet pipe length
Preconditions:
TM06 4349 4117
Pos. Description
1 Highest tapping point
2 Isolating valve
3 Flexible hoses
4 Pipe support
5
Inlet filter.
If the water may contain sand, gravel or other debris,
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).
TM06 4348 4117
Pos. Description
1 Highest tapping point
2 Pipe hangers
3 Isolating valve
4 Flexible hoses
5 Drain to sewer
6
Inlet filter.
If the water may contain sand, gravel or other debris,
please install a filter on the inlet side to protect the pump
and installation.
7 Freshwater tank
H2 H1
6
5
4
2
3
1
A
1
2
3
4
6
7
8
5
8 Foot valve with strainer (recommended)
A Minimum 1 ° inclination
TM06 4372 4117
DN 32 DN 40
H
[m (ft)]
L
[m (ft)]
H
[m (ft)]
L
[m (ft)]
0 (0) 68 (223) 0 (0) 207 (679)
3 (10) 43 (141) 3 (10) 129 (423)
6 (20) 17 (56) 6 (20) 52 (171)
7 (23) 9 (30) 7 (23) 26 (85)
8 (26) 0 (0) 8 (26) 0 (0)
Maximum flow velocity: 1 l/s (16 gpm).
Inside roughness of pipes: 0.01 mm (0.0004 inch).
Size
Inside pipe diameter
[mm (inches)]
Pressure loss
[m/m (psi/ft)]
DN 32 28 (1.1) 0.117 (5/100)
DN 40 35.2 (1.4) 0.0387 (1.6/100)
Pos. Description
H
L