Grundfos LS - 3.5.6 Installations with vertical inlet pipe in confined space

Correct
DN
10 x DN
1
2
DN
3-5 x DN
3
4
Recommended inlet pipe installation with a length
of straight pipe between horizontal elbow and
pump
Pos. Description
1 Open system
2 ≥ 10 x DN plus expansion joint
3 Closed system
4 3-5 x DN plus expansion joint
Wrong
1
2
TM040149
Unbalanced loading of a double-suction impeller
due to uneven flow through a horizontal elbow
close to the pump
Pos. Description
1 Uneven flow
2
Water pressure increases here causing a
greater flow to one side of the impeller than
to the other
3.5.6 Installations with vertical inlet pipe in
confined space
1
TM040096
Inlet diffuser (1) in the inlet pipe
19
English (GB)