caprari MEC-A Serie Instrucciones De Servicio página 21

Faults
6. The unit delivers a
very low flow rate.
7. Although it operates,
the unit absolutely
fails to deliver water.
8. The unit is noisy and
vibrates.
9. The unit fails to
automatically stop.
10. The hydraulic seal on
the shaft drips
excessively.
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Probable causes
6.1. Air enters through the suction port.
6.2. The electric motor turns in the wrong direction.
6.3. The check valve or foot valve has jammed in a
partially closed position.
6.4. Worn pump.
6.5. Partially closed sluice valve.
6.6. Pump operating at cavitation rate.
6.7. Strainer clogged by foreign bodies.
6.8. Rotation speed too low.
7.1. Pump loses prime owing to insufficient suction
head.
7.2. Pump loses prime owing to excessive flow rate.
7.3. The check valve or foot valve has jammed in a
closed position.
7.4. Closed sluice valve.
7.5. Pump excessively worn.
7.6. Transmission coupling worn owing to an
excessive number of hours service and/or too
many starts and/or bad alignment.
7.7. Strainer clogged by foreign bodies.
7.8. Rotation speed too low.
8.1. Incorrect plant installation.
8.2. Water containing a high amount of gas.
8.3. Worn shaft.
8.4. Incorrect plant installation or assembly of the
components.
8.5. Pump operating at cavitation rate.
8.6. Stress transmitted by the pipes to the pump
casing.
9.1. Insufficient flow rate of the unit.
9.2. The automatic monitoring devices of the system
or motor fail to enable operation.
10.1. The hydraulic seal is no longer efficient.
MEC-A / MEC-MR / MEC-MG / HM / HMU / BHR
6.1. Increase the level of liquid at the suction port.
6.2. Reverse two of the three phases.
6.3. Disassemble the valve from the pipe and check.
6.4. Send the pump to an authorized After-Sales
Service center.
6.5. Open the sluice valve.
6.6. Compare the suction pressure with the NPSH
values given in the specific technical
documentation.
6.7. Remove the obstruction.
6.8. Regulate the internal combustion engine.
Make sure that the pump - electric motor
combination has been correctly selected.
7.1. See 6.1.
7.2. Make sure that the right product has been
selected.
Reduce the flow rate by means of the sluice
valve on the delivery pipe.
7.3. See 6.3.
7.4. Adjust the sluice valve.
7.5. See 6.4.
7.6. Make sure that the flexible elements are in a
good condition and replace them if necessary
(consult paragraph 6.3 "Maintenance" for a
description of the procedure).
7.7 See 6.7.
7.8. See 6.8.
8.1. See 6.1.
8.2. See 6.1.
8.3. See 6.4.
8.4. Check according to the specifications given in
paragraph 5.3 "Mechanical connections".
8.5. See 6.6.
8.6. Check the maximum stress values in the
"Flange stress" table in chapter 11 "Technical
data".
Connect the pump to the pipes by means of
compensation joints.
9.1. Make sure that the unit has been correctly
selected.
Also consult 6.3, 6.4, 6.5.
9.2. See 1.3.
10.1. Replace it according to the procedure
described in paragraph 6.3 "Maintenance".
Send the unit to an authorized After-Sales
Service center if necessary.
Remedies
21
GB