Page 57 of 68 – Flowserve Byron Jackson Type M User Manual
Page 57
®
Byron Jackson Double Mechanical Seal Submersible Pumping Unit • 1042.293/9 • June
04
Page 57 of 68
FAULT SYMPTOM
Motor protection triggered
⇓
⇓ Pump does not start
⇓
⇓ Flow inadequate
⇓
⇓ Pumping unit runs, but does not pump
⇓
⇓ Shut-off head current (amps) is higher than originally recorded but shut-off head is not diminished
⇓
⇓ Shut-off head is diminished but shut-off current (amps) is unchanged
⇓
⇓ Shut-off head is diminished and shut-off current (amps) is much higher
⇓
⇓ Duty capacity and head are low but running current (amps) and shut-off valves are normal
⇓
⇓ Pump starts bus trips circuit breaker
⇓
⇓ Pump does not start
⇓
⇓ PROBABLE CAUSES
POSSIBLE REMEDIES
A. SYSTEM TROUBLES
z Pump
or
motor
sluggish
Check
smooth
running
of
pump
and
motor.
z
Heat to great because total system head does
not correspond to pump characteristics.
Reduce head.
z
Unit not suspended in pumping medium due to
inadequate installation depth.
Check well level and/or suspend unit
deeper.
B. MECHANICAL TROUBLES
z
Pump blocked due to impurities in the pump.
Disassemble pump section and clean.
z Reduction
of
area
in
the
pressure
pipe
be-
cause isolator valves are not completely open.
Completely open isolator valves.
z Reduction
of
area
in
the
pressure
pipe
be-
cause pressure pipe is clogged.
Clean pressure pipe.
z Reduction
of
area
in
the
pressure
pipe
be-
cause of foreign body in the pipe.
Clean pipework.
z Reduction
of
area
in
the
pressure
pipe
be-
cause well filter stopped up.
Remove unit and regenerate well.
z Pressure
pipe
leak
due
to
defective
pipework. Check
pipework.
z Impellers
worn
out
because
of
high
sand
con-
tent in the pumping medium.
Remove pump and repair.
Check material selection.
Analyze water.
z Impellers
worn
out
because
of
corrosive
pump-
ing medium
Remove pump and repair.
Check material selection.
Analyze water.
z Impellers
worn
out
because
of cavitation.
Check operating conditions.
z Pressure
pipe
not
free
because
main
slide
valve is closed.
Check blockage and control units.
z Motor runs but pump does not turn because
coupling between pump and motor is defective.
Remove unit and repair.
z Suction
sieve
stopped
up
because
of
foreign
body in well
Remove unit and clean suction sieve..
z Fracture
in
riser
pipe
Replace respective riser pipe
z
Valve open on by-pass line etc.
Close respective valve