OPERATING INSTRUCTIONS
26
conditions. In case the operating liquid should
be very hard water or a medium charged with
contaminations, the vacuum pump as well as
the attached separator have to be rinsed from
time to time or possibly to be opened and to be
cleaned.
9
Disturbance, Causes and Fault Removal
Disturbance
Cause
Action
pump runs loudly
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
quantity of fresh liquid F is too
high
liquid in medium D:
check position of regulating
valve, adjust it
pump does not reach the
vacuum capacity specified
(pressure/volume)
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 tem-
perature by suitable means.
gas resp. liquid channels are
closed
disassembly the pump and
especially clean the channels
mechanical seal is leaking
change mechanical seal
quantity of discharge liquid A is
too low
check discharge pipe on flow-
pump is blocked
corrosion between rotor and
casing
eliminate by use of anti-rust
liquid
ice
in
pump
ring liquid is congealed:
heaten it carefully, thaw it
impurities, foreign bodies in
pump
disassemble and clean the
pump
power input of pump is too
high
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
frictions between impeller and
inter casing
disassemble the pump, clean
it and adjust the correct play