P
P
a
a
g
g
e
e
3
3
o
o
f
f
2
2
4
2. WARNINGS
When choosing a pump, first decide its flow (l/min) you required and then the pump series for the specific application.
2 .1. SUCTION HOSE
The pump is thought to give its capacity, but according to the load suction there may be restrictions because the suction
pipe is too long or its diameter is too small. This restriction could even restrict the pump liquid demand, causing its
cavitation and breaking down the liquid into a mixture of liquid and vapour as it goes into the pump.
Not only does the result of cavitation give less delivery, but also an increase of the noise, the vibration, the wear of the
pump and other parts.
The cavitation may be also caused because of the use of other components of inadequate size in the pipe, like valves,
elbows and suction emergency connections with the consequent flow reduction.
2.2. DELIVERY PIPE
The pipe, the hose, the meters and the other equipment in the installation must be selected for a minimum flow reduction. If
they are too small, the pump may work at low revolution in order to eliminate the excessive pressure in the system,
decreasing the delivery frequency.
It a system is designed for a larger sizes, remember the simplicity of the system also reduces its resistance.
It is advisable to consider the convenience of reducing the pipe length or the number of elbows or other couplings.
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