06
Installation
Air pocket
Concentric
reducer
Air leaks
A valve in the suction pipe
is not recommended
Long piping
“D”
Vortex
Without
strainer
Too much
height
Less than
4x “D”
Piping elbow immediately
installed after the suction
Figure 2
Wrong installation.
Suction Height
- suction pipe should
have a slope of 0.39" per 3.3 ft of
suction. Never exceed 16.4 ft suction,
considering friction.
(Figure 3)
Positive/Drowned Suction
- A gate
valve is installed in the suction pipe
to service the pump
(Figure 4)
. Volute
or body have plugs, and these must
be removed to allow trapped air to
escape.
0.39" of inclination
per 3.28 ft
CORRECT
INCORRECT
Air pocket
Figure 3
Inclination.
Check valve
(completely open)
CORRECT
“D”
6x “D” min.
Pressurized water
Figure 4
Positive suction.
A retention valve in the suction pipe
is not recommended. If required,
better install the valve in the
discharge pipe.
INCORRECT
Valve partially
closed
Figure 5
Positive suction.
Use pipe or hose reinforced
sufficiently
robust
to
prevent
destruction due to high pressure.
Discharge pipe
Because the cost of energy or BHP
necessary to overcome the friction
generated by using a smaller
diameter pipe, a larger diameter
discharge pipe is commonly used
than that required by the volute or
body.
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