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9.6.7 Dimensions of the flow-straightening vane
Design of the intake chamber wall surfaces (to prevent vortex formation)
The flow-straightening vane is indispensable for the inlet conditions of the pump set.
It prevents the development of a submerged vortex (floor vortex) which could cause
a drop in performance, for example. In addition, the floor and wall surfaces of the
intake chamber should be designed as a rough concrete surface. Rough surfaces
minimise the separation of boundary layers that may cause wall and floor vortices.
Flow-straightening vane and intake chamber
▪ The anti-swirl baffles in the bellmouth must be aligned with the flow-
straightening vane.
▪ The bail of the pump is oriented in the same direction as the anti-swirl baffles in
the bellmouth.
1
2
3
Fig. 56: Installation position of the pump set
1
Bail
2
Anti-swirl baffles
3
Flow-straightening vane
Variant 1
Flow-straightening vane cast from
concrete
s
2
s
1
(e
)
1
l
R
Amacan P
Variant 2
Steel section
s
R
A
B
C
D
(e
)
1
l
R
105 of 112
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