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EBARA Horizontal Split Case Pump
Operating, Installation, and Maintenance
7 7 . . T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
F F a a u u l l t t
The motor does
- The motor has failed.
- Power is down.
not
start,
or
- Rotating parts stick together, rusted, or
whines but does
not start.
- A foreign object is caught in the rotating part.
The motor can
- No water priming started.
- Gate valve closed or half-open.
run, but no
- The motor rotates in the reverse direction.
water.
- The rotation speed is slow.
The specified
flow rate has
not been
reached.
- A foreign object stuck on the impeller
- A foreign object is stuck in the piping
- Foreign object stuck on foot valve/filter
- Air entrapment occurs.
- Foot valve or suction line port is not properly
- There is a leak in the discharge line.
- The impeller is corroded.
-
- The impeller is worn out.
- The sealing ring is worn.
- Excessive pipe resistance.
- The suction head or discharge head is too high.
- The liquid is hot, or the liquid is volatile.
- Cavitation has occurred.
The
pump
was
- Insufficient priming of the pump
- Air entrapment occurs.
able
to
start
- Air entrapment in the suction duct.
but stopped for
- The suction head is too high.
a short time.
Overcurrent of
- The rotation rate is too high.
motor
- The head is too low, or the discharge flow is
- The bearing is damaged.
- Contact with rotating parts, or the shaft is
- The specific gravity or viscosity of the liquid
The bearing
- There was damage to the bearing.
temperature is
- Cut-off operation continued for too long.
too high.
The pump
- The bearing is damaged.
vibrates or
emits.
Large noise.
- Discharge flow is too large.
- Foreign objects stuck on the impeller
- The direction of rotation of the motor is
reverse.
- Cut-off operation continued for too long.
- Contact with rotating parts, or the shaft is bent. - Contact your nearest firm
- A cavitation has occurred.
- Pipeline resonance has occurred.
- The mechanical seal is damaged.
Excessive
leakage at the
- boost pressure too high
shaft seal.
EBARA
PUMPS AMERICAS CORPORATION
PM10U-
www.pumpsebara.com
(t) 803.327.5005 (f) 803.327.5097
C C a a u u s s e e s s
sintered.
* The number of poles of the motor does not
match the specification.
* The voltage is too low.
submerged under water.
* The number of poles of the motor does not
match the specification.
too large.
bent.
is too high.
M M e e a a s s u u r r e e s s t t o o b b e e t t a a k k e e n n . .
- Please contact your nearest office
- Replace or repair.
- Turn the motor by hand, reassemble, or send to the
manufacturer for repair.
- Remove foreign objects.
- Perform a priming water injection.
- Open the gate valve.
- Check and correct wiring.
-
* Check with nameplate and replace with correct motor.
* Check the power status.
- Remove foreign objects.
- Remove foreign objects.
- Remove foreign objects.
- Inspect and repair suction line and shaft seal.
- Extend the suction pipe and submerge its port to a
depth of 2D.
- Replace or repair.
- Check liquid properties and change materials
accordingly.
- Contact the firm closest to you.
- Contact the firm closest to you.
- Reconsider the layout of the system.
- Reconsider the layout of the system.
- Reconsider the layout of the system.
- Contact the firm closest to you.
- Fully carry out the pump filling operation.
- Inspect and repair suction line and shaft seal.
- Rearrange piping.
- Reconsider the layout of the system.
* Check with the nameplate and replace with the
correct motor.
- Reduce the opening of the discharge valve to the
specified flow rate.
- Contact the firm closest to you.
- Contact the firm closest to you.
-
- Reconsider the layout of the system.
- Contact your nearest firm..
- Stop the operation.
- Contact your nearest firm.
- Reduce the opening of the discharge valve to achieve
the rated flow rate.
- Remove foreign objects.
- Check and correct the wiring.
- Stop the cut-off operation.
- Contact your nearest firm.
Improve the piping layout.
- Contact the firm closest to you.
- Reconsider the layout of the system.
- 23 -
CB Series
EBARA
CORPORATION
23
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