MODE D'EMPLOI
28
19
Disturbance, Causes and Fault Removal
Disturbance Cause Action
when running with lower suction
pressure than indicated (also at
closed suction side) or when the
percentage of steam in the medium
is too high, a grating noise is caused
remedy see 7.2
pump runs loudly
quantity of fresh liquid F is too high liquid in medium D:
check position of regulating
valve, adjust it
leakage in system shut-off device is opened
incorrect: check system, seal the
leakages
quantity of operating liquid too small check pipes and position of
regulation valve, adjust it
temperature of operating liquid is too
high
The characteristic curves are
referring to water with 15 °C ring
liquid so that at higher operating
liquid a reduction of the vacuum
and also the suction capacity will
be caused. (Reduce the
temperature by suitable means.
gas resp. liquid channels are closed disassembly the pump and
especially clean the channels
mechanical seal is leaking change mechanical seal
pump does not reach the vacuum
capacity specified
(pressure/volume)
quantity of discharge liquid A is too
low
check discharge pipe on flow-
corrosion between rotor and casing eliminate by use of anti-rust
liquid
ice in pump ring liquid is congealed: heaten it
carefully, thaw it
pump is blocked
impurities, foreign bodies in pump disassemble and clean the pump
quantity of operating liquid too high adjust the regulating valves
density resp. viscosity of liquid too
high
the performance data refer to
water(1000 kg/m
3
, 1 mm
2
/s),
bigger density resp. viscosity
require higher performance of
shaft. Different operating liquid
or bigger motor power to be
considered
power input of pump is too high
frictions between impeller and inter
casing
disassemble the pump, clean it
and adjust the correct play
20
Service Value Limits
V / VG
pump size
1 6 - 430
inlet pressure [mbar] 75 33
pressure difference
suction- / discharge side [mbar]
200
1030
200
1100
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