TROUBLESHOOTING
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby
– Denmark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]m
62
Description of
poosible failure
Impacts on the
pump/system
Indications of
failure
How to avoid
Bad piping and fitting
arrangement
Turbulent flow and
vibrations in the
system
1. Vibration, and
noises from the
piping system.
2. Possible
premature
leakage from
mec. seal
1. Check piping and
fitting
arrangement is in
accordance with
CEN standards.
2. Should be
reviewed and
approved in
design phase
Starvation / lack of
inlet flow
Pump not receiving
enough liquid to give
a stable operation,
pump not giving
sufficient flow. Could
cause insufficient
liquid film in seal and
cause dry running
1. Vibrations in the
pump and
unstable
operational
readings
2. Flow not
increasing at
higher pump
speed.
3. Possible leaking
mechanical seal
1. Make sure all
valves are open,
and no filters are
clogged etc.
2. Check piping and
fittings
3. Other consumers
on the same
suction line might
cause problems
High liquid velocities
Vibrations and
turbulent flow in the
system
1. Noise, vibrations
and lack of pump
performance.
2. Possible leaking
mech. shaft seal
1. Make sure to
have piping
dimensioned for
specified flow
rating
2. In general liquid
velocity should
increase from
piping inlet
trough the pump
to the outlet
External excited
vibrations from the
vessel or piping
system
If above
recommended levels
(7mm/s) it can lead
to premature
mechanical failures
1. Visual and
measured
vibration levels.
2. Leaking mech.
shaft seal
1. Install vibration
reducing
components
such as flexible
bellows at
inlet/outlet,
vibration pads on
base plate,
horizontal lateral
support on motor
Содержание NSL 100-215
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