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© 2014
SLF 2250/4000
Hydromatic Stinger
WRONG
vortex
CORRECT
WRONG
air pocket in suction hose
Operating the Pump System
Drafting Operation from Open Water Source
- When pumping by draft, water is sucked from a supply such as
a pond, lake, or river.
- Manoeuvre as close as possible to water supply.
- Apply parking brake.
- Connect suction- and pressure hoses.
◊
The suction hose with attached strainer should be at least 20
cm under the water surface (Do not place the strainer in sand
or mud as dirt reduces the service life of the pump system!).
ATTENTION !
When the suction height is increased, the pump capacity is re-
duced, which means that the nozzle diameter must be reduced to
maintain a low discharge rate and constant pressure. When
operating with great suction heights, high pump speeds and large
nozzle diameters the pump may cavitate. Cavitation sounds like
marbles are being pumped through the system, and a slight
pressure drop is visible at the manometer.
Cavitation must be avoided by all means, because the internal
parts of the pump might be damaged by this excessive load.
Remedy: Decrease speed, water discharge, or suction height.
With DRE-operation cavitation is indicated by a signal on dis-
plays.
Never operate the pump without a strainer or suction screen, or at
full speed without a nozzle - cavitation may occur.
Watch the declining water level of the water source.
When operating in drafting or hydrant mode with a water dis-
charge of more than 2500 l/min, use both drafting connections. If
this warning is ignored, the pump may cavitate and severely
damage the internal parts of the pump.
Note:
Avoid operating the pump without water for longer than 3 minutes.
Operation without water supply can result in damage of the pump
shaft seal.
