Specification

3. Installation and operation
3.1 Mechanical installation
Placing the pump above ground is generally a convenient
way to establish water or rainwater supply
. The pump can
be installed both indoors and outdoors.
The product should be placed as close as possible to the
liquid to be pumped to minimize the length of the inlet
pipe. The motor is water-cooled, but we still recommend a
clearance of 0.5 m (1.64 ft) on three sides of the product.
The product should be fastened to a solid horizontal
foundation with a maximum inclination angle of ± 5 °. The
base plate must be facing downwards.
If the pump is used for pumping rainwater or well water,
we recommend installing a filter on the inlet side to protect
the pump from sand, gravel or other debris. If the pump is
installed above the liquid level, we recommend fitting a
foot valve with a strainer to the inlet pipe.
3.1.1 Pipe system
To obtain the optimum suction capacity which the dry-
installed pump is designed for, the correct dimension of
the pipe system is important. If a hose is used as inlet
pipe, it must be non-collapsible.
The diameter of the inlet pipe must be larger than 1", if the
inlet pipe is longer than 10 m (32.8 ft), or if the suction lift
exceeds 4 m (13.1 ft).
3.1.2 Inlet pipe length and suction lift
The length of the inlet pipe of self-priming pumps depends
on the geodetic suction lift. The recommended maximum
length of the inlet pipe according to the suction lift is
shown in the figure below. The example shows that if the
suction lift is 2.5 m (8.2 ft), the length of the inlet pipe
must not exceed 25 m (82 ft).
TM075339
Maximum inlet pipe length (horizontal axis) according to
the suction lift (vertical axis)
3.1.3 Inlet and outlet pipes
Follow these general precautions when connecting the
inlet and outlet pipes.
•
Install the pipes so that air pockets are avoided,
especially on the inlet side of the pump.
• Use eccentric reducers with the tapered side down.
• Make sure the pipes are as straight as possible to
avoid unnecessary bends and fittings. We recommend
long-radius 90 ° pipe bends to decrease friction loss.
• If possible, run a horizontal inlet line. We recommend
a gradual upward slope for pumps operating in
suction-lift conditions.
• A short pipe must be of the same diameter as the inlet
port or larger.
• A long pipe must be one or two sizes larger than the
inlet port, depending on the length.
TM040338
Recommended pipe installation to avoid friction and air
pockets
TM075387
Correct pipe sizing for connection to the pump inlet or
outlet
SCALA
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Installation and operation