Interpump SS71 - 14 Warranty Conditions; 15 Operating Faults and Their Possible Causes

ENGLISH
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14 WARRANTY CONDITIONS
The guarantee period and conditions are contained in the
purchase agreement.
The guarantee will in any case be invalidated if:
a) The pump is used for purposes other than the agreed
purposes.
b) The pump is driven by an electric motor or internal
combustion engine having performance values exceeding
those shown in the table.
c) The safety devices provided are uncalibrated or
disconnected.
d) The pump has been used with accessories or spare parts
not supplied by Interpump Group.
e) Damage has been caused by:
1) improper use
2) failure to follow maintenance instructions
3) any use dierent from that described in the operating
instructions
4) lack of sucient ow rate
5) defective installation
6) improper positioning or sizing of pipes
7) unauthorized design modications
8) cavitation.
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.
- No suction water.
- Valves are jammed.
- Outlet line is closed and thus prevents the
release of air trapped in the pump manifold.
Pump pulsates irregularly:
- Air suction.
- Insucient supply.
- Bends, elbow bends, ttings along the suction
line are choking the passage of liquid.
- The suction lter is dirty or too small.
- The booster pump, where installed, is supplying
insucient pressure or ow rate.
- The pump is not primed for insucient head or
the outlet is closed during priming.
- The pump is not primed due to valve jamming.
- Worn valves.
- Worn pressure seals.
- Imperfect functioning of the pressure control
valve.
- Problems on the transmission.
The pump does not supply the nominal ow rate/
excessive noise:
- Insucient supply (see various causes as above).
- Rpm lower than the nominal speed;
- Excessive internal leakage of the pressure control
valve.
- Worn valves.
- Excessive internal leakage from pressure seals.
- Cavitation due to:
1) Improper sizing of suction ducts/undersized
diameters.
2) Insucient ow rate.
3) High water temperature.
The pressure supplied by the pump is insucient:
- The user ow (nozzle) is or has become greater
than the pump capacity.
- Insucient pump rpm.
- Excessive internal leakage from pressure seals .
- Imperfect functioning of the pressure control
valve.
- 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).
- Excess belt tension or joint or pulley alignment is
incorrect.
- Excessive pump tilt during operation.
Vibrations or hammering on pipes:
- Air suction.
- Faulty operation of the pressure control valve.
- Valves malfunction.
- Irregular drive transmission.