Operation
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Operation
7.6.5 External drafting/priming
NOTICE
Material damage due to cavitation!
With increasing suction lift the pump performance is reduced. Too high
suction lifts, very large flow rates and high pump speeds can lead to
cavitation in the pump. Cavitation causes extreme local pressure peaks,
which can damage the pump. Cavitation of the pump can be recognized by
a sharp drop in performance and noises in the pump, which sound as if
pebbles are being pumped. Cavitation of the pump must be avoided at all
costs, otherwise internal parts of the pump (e.g. impeller) are damaged. If
the suction hose is pulled together during external drafting operation, the
water column may break off.
Only operate pump in external drafting operation with suction strainer
and suction filter.
If there is danger of cavitation reduce pump speed, flow rate or suction
lift.
Do not operate the pump at high speed and free discharge.
Monitor all display instruments of the pump unit.
Observe the lowering of the water at drafting points.
Use dimensionally stable suction hose for external drafting operation.
Position of drafting hose during external drafting
1 Air in hose
2Vortex
3 Correct position of the suction hose
The suction hose with suction strainer should be at least 20 cm (10 ") under
water. Do not place the suction hose in mud or sand. Contaminants shorten
the service life of the pump unit!
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