caprari HVX Serie Betriebs- Und Wartungsanleitung Seite 17

Faults
5. The electric pump
delivers at a decidedly
poor flow rate.
6. Although it operates,
the electric pump
delivers absolutely no
water.
7. The electric pump is
too noisy and vibrates.
8. The electric pump fails
to automatically stop.
9. The hydraulic seal on
the shaft drips
excessively.
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Probable causes
5.1. Air intaken from the suction mouth.
5.2. The motor turns in the wrong direction.
5.3. The check valve is blocked in a partially closed
position.
5.4. Worn electric pump.
5.5. Partially closed sluice valve.
5.6. Pump operating in cavitation conditions.
6.1. Pump unprimed owing to insufficient head.
6.2. Pump unprimed owing to an excessive flow rate.
6.3. The check valve has blocked in the closed
position.
6.4. Closed sluice valve.
6.5. Excessively worn electric pump.
7.1. Plant installed incorrectly.
7.2. Water containing a high amount of gas.
7.3. Worn shaft and guide bearing.
7.4. Pump imperfectly fixed to its base.
7.5. Worn shaft supports.
7.6. Pump operating in cavitation conditions.
7.7. Excessive stress transmitted from the pipes to
the pump casing.
8.1. Insufficient flow rate.
8.2. The automatic monitoring devices (level gauge,
etc.) are not enabling the pump to stop.
9.1. The hydraulic seal is no longer efficient.
9.2. The shaft vibrates since the supports are
worn.
Remedies
5.1. Increase the level of the liquid in the suction
mouth.
5.2. Invert two of the three phases.
5.3. Demount the valve from the pipe and check.
5.4. Send the pump to an authorized after-sales
service center.
5.5. Open the sluice valve.
5.6. Compare the suction pressure with the NPSH
values in the specific technical documentation.
6.1. See 5.1.
6.2. Check that the right product has been selected.
Reduce the flow rate by means of the sluice
valve of the delivery pipe.
6.3. See 5.3.
6.4. Adjust the sluice valve.
6.5. See 5.4.
7.1. See 5.1.
7.2. See 5.1.
7.3. See 5.4.
7.4. Check according to the specifications in
paragraph 5.3. "Mechanical connections".
7.5. Send the unit to an authorized after-sales
service center.
7.6. See 5.6.
7.7. Connect the pump to the pipes by means of
compensating couplings.
8.1. Check that the right product has been selected.
Also see 5.3. - 5.4. - 5.5.
8.2. See 1.3.
9.1. Replace the seal according to the procedure
in paragraph 9.2. "Maintenance".
9.2. Send the unit to an authorized after-sales
service center.
HVX - HVXS
GB
17