Xylem Lowara MPB User Manual

Installation, Operating and Maintenance Instruction Model MPB, MPV
operator cannot or does not want to repair. If the
operator repairs or changes the pump, the design data
on the Data Sheet and chapter 2 of these Operating
Instructions should be particularly taken into account.
If necessary, the written agreement of the
manufacturer must be obtained.
Discharge too low
Discharge stops after a time
Head too low
Head too high
Drive mechanism overloaded
Pump not running quietly
Temperature in pump too high Temperature in shaft sealing too high Temperature at the bearing too high Pump leaking
Leakage rate at shaft sealing too high
Cause Solution
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Back-pressure too high
check facility for pollution, open discharge valve
reduce resistance in discharge pipe (e.g. clean filter if
necessary)
use larger impeller (note available motor power)
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Back-pressure too low, discharge too low
throttle discharge valve
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Speed too high
reduce speed
compare speed of motor with specified pump speed (rating
plate)
when adjusting speed (frequency transformer) check refer-
ence value setting
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Speed too low
increase speed (check available motor power)
compare speed of motor with specified pump speed (rating
plate)
when adjusting speed (frequency transformer) check reference
value settings
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Flow too little
increase min. flow (open discharge valve, bypass)
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Flow too big
reduce flow (throttle discharge valve)
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Impeller diameter too big
use smaller impeller
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Impeller diameter too small
use larger impeller (check available motor power)
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Pump and/or pipes not completely filled with liquid
fill
vent
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Pump or suction/intake pipe blocked
clean
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Air pocket in pipeline
vent
improve course of pipe
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Suction height too big / NPSH of system too small
increase liquid level and admission pressure
reduce resistance in the intake/suction pipe (change course
and rated width, open shut-off valves, clean filters)
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Air being sucked in
increase liquid level
check if suction pipe is vacuum-tight
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Air being sucked in through shaft sealing
clean sealing pipe
increase sealing pressure
replace shaft sealing
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Direction of rotation is wrong
swap over two phases of power supply (to be done by an
electrician)
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Inner components suffering from wear
replace worn parts
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Density and/or viscosity of liquid handled is too high
seek assistance
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Stuffing box not straight
tighten evenly
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Stuffing box is fastened too tight resp. shaft sealing is worn
loosen stuffing box
replace packing and/or mechanical seal
check sealing, flushing and cooling pipes (pressure)
avoid dry running
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Lines and roughness on shaft or shaft sleeve
replace parts
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Unsuitable packing material
use suitable material (check shaft or shaft sleeve for damage
beforehand)
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Deposits on mechanical seal
clean
replace mechanical seal if necessary
if necessary provide additional rinsing or quench
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Impeller out of balance
remove blocks/deposits
replace impeller if broken or unevenly worn
check shafts to ensure that they are running true
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Coupling not aligned
align pump unit better
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Coupling distance too small
change
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Forces in pipeline too high (pump unit under strain)
change (support pipes, use compensators, etc.)
is foundation plate/frame properly cast in place?
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Too much, too little or the wrong type of lubricant
change
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Electricity supply not right (2-phase running)
check voltage of all phases
check cable connections and fuses
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Sealing insufficient
tighten screws
replace sealing
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Bearing damaged
replace
check lubricant and bearing space for pollutants (rinse oil area)
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Relief fittings insufficient
clean relief openings in impeller
replace worn parts (impeller, split rings)
adjust in line with the system
pressure/intake pressure given on
ordering
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System-related vibrations (resonance)
seek assistance
MPB 100-english page 94
Article No 771074115

Xylem Lowara MPB Specifications

General

Brand	Xylem
Model	Lowara MPB
Category	Water Pump
Language	English