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Les langues disponibles
15
OPERATING FAULTS AND THEIR
POSSIBLE CAUSES
The pump does not produce any noise upon
start-up:
-
The pump is not primed and is running dry.
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No suction water.
-
Valves are jammed.
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The outlet line is closed and does not allow the
release of air present in the pump manifold.
Pump pulsates irregularly:
-
Air suction.
-
Insufficient supply.
-
Bends, elbows, fittings on the suction line are
choking the passage of liquid.
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Suction filter is dirty or too small.
-
The booster pump, where installed, is supplying
insufficient pressure or flow rate.
-
The pump is not primed due to insufficient head
or the outlet is closed during priming.
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The pump is not primed due to valve jamming.
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Worn valves.
-
Worn pressure seals.
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Imperfect functioning of the pressure control
valve.
-
Problems on the transmission.
The pump does not supply the nominal flow
rate/excessive noise:
-
Insufficient supply (see various causes as above).
-
Pump speed is below the rated speed;
-
Excessive internal leakage of pressure control
valve.
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Worn valves.
-
Excessive leakage from the pressure seals.
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Cavitation due to:
1) Improper sizing of suction ducts/undersized
diameters.
2) Insufficient flow rate.
3) High water temperature.
The pressure supplied by the pump is insufficient:
-
The user flow (nozzle) is or has become greater
than the pump capacity.
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Insufficient revolutions per minute.
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Excessive leakage from the pressure seals.
-
Imperfect functioning of the pressure control
valve.
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Worn valves.
Pump overheats:
-
The pump is working in overpressure conditions
or pump rpm is higher than the nominal value.
-
Oil in the pump casing is not at level or not the
recommended type as detailed in chapter 7 (see
par. 7.6).
-
Joint or pulley alignment is incorrect.
-
Excessive pump tilt during operation.
Vibrations or hammering on pipes:
-
Air suction.
-
Faulty operation of pressure control valve.
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Valves malfunction.
-
Non-uniformity of transmission motion.
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