Fault description Cause Remedy Personnel
Pumped volume
below the nominal
value
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 or too small*
— Adjust the pipe diameter to the
pump output of the rotary lobe
pump*
Mechanics
Diameter of the pres-
sure line (side of outlet)
too small
— Adjust the pipe diameter to the
pump output of the rotary lobe
pump*
Mechanics
Shut-off devices not
open or not open com-
pletely
, or pipes blocked
— Open shut-off device
— Clean the pipes
Mechanics
Counter-pressure too
high for other reasons
— Reduce the counter-pressure
—
Install pressure monitoring
equipment
Mechanics
Speed too low* — Increase the speed* Mechanics
Viscosity of pumped
medium too high*
— Reduce the viscosity when pos-
sible*
—
Change the pump position* or
install an auger upstream
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
Rotors worn as part of
regular use
— Replace the rotors Mechanics
Wear on casing liners or
pump casing
— Replace worn parts Mechanics
Operation
BA-Classic FL_en-US, 03.05.2018 www.boerger.de / www.boerger.com 101
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