Fault description Cause Remedy Personnel
— Check the pipes for damage
and rectify
, if necessary
— Rule out any leaks on compo-
nents (pressure gauges, ball
valves etc.)
Suction line completely
empty
— Lower the pump* and prevent
emptying of the pump chamber
,
e.g. with 90° pipe bend at the
inlet
— Otherwise provide start-up
volume
Mechanics
Suction height too large
(> 8 m / 26.25 ft)*
— Reduce the suction height
(lower the pump)*
Mechanics
Diameter of the suction
line (side of inlet) too
large*
— Adjust the pipe diameter to the
pump output of the rotary lobe
pump*
Mechanics
Several or all suction
lines open with cross-
linked pipes
— Only open the shut-off device of
the suction line which is cur-
rently in pump operation
Mechanics
Viscosity of pumped
medium too high*
— Reduce the viscosity when pos-
sible*
—
Change the pump position* or
install an auger upstream
Mechanics
Build-up of air pockets
(pump could not dis-
charge air on pressure
side)
— Provide venting Mechanics
Rotors damaged due to
dry run
— Replace the rotors
—
Replace mechanical seal
(strongly recommended if rotors
were damaged due to dry run)
— Determine the cause of dry run
and eliminate it
Mechanics
Rotors damaged due to
foreign bodies
— Replace the rotors
—
Install a macerator (Multi-
crusher, Multichopper) and a
stone trap upstream, if neces-
sary
Mechanics
Operation
BA-Classic FL_en-US, 03.05.2018www.boerger.de / www.boerger.com98
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