Suction Pipe Length - Grundfos SCALA Installation And Operating Instructions Manual

3.5.3 Suction from freshwater tank
min1
7
6
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
6 Foot valve with strainer
7 Freshwater tank
1
2
3 4
5

3.6 Suction pipe length

The overview below shows the different possible
pipe lengths, depending on the vertical pipe length.
The overview is only intended as a guide.
L
Fig. 8
Suction 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
Size
diameter
28 mm
DN 32
(1.1 inches)
35.2 mm
DN 40
(1.4 inches)
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
0.117 m/m
(5 psi/100 ft)
0.0387 m/m
(1.6 psi/100 ft)
7