Operation
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Priming from an open water source
7.4 Priming from an open water source
NOTICE
Damage due to cavitation!
The pump capacity is reduced with increasing suction height. When
operating with great suction heights, high pump speeds and very high
discharge rates, the pump may cavitate. Cavitation causes extreme
pressure and temperature peaks which can destroy the pump. Cavitation
may sound like marbles are being pumped through the system. Cavitation
must be avoided by all means, because the pump internal parts (e. g.
impeller) might be damaged by this excessive load. A constricted suction
hose while external drafting may result in loss of the water flow.
In external drafting operations from open water never run the pump
without a strainer.
If cavitation occurs, reduce pump speed, suction height or water
discharge.
Never run the pump at high speed with a free outlet.
Monitor all display instruments of the pump.
Watch declining water level of the water source.
Use non-collapsible hose for drafting operation.
Position the suction hose ready for intake from an open water source
1 Air in hose
2Vortex
3 Correct position of the suction hose
The suction hose with strainer should be at least 20 cm under water. Do not
place the suction hose in mud or on sand. Contaminants shorten the ser-
vice life of the pump unit!
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