INSTRUCTION FOR THE USE AND MAINTENANCE - LIBELLULA 1/3” SERIES - Vers. 1/16
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INSTRUCTION FOR THE USE AND MAINTENANCE - LIBELLULA 1/3" SERIES –vers. 01/16
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17. OPERATING PROBLEMS: CAUSES AND SOLUTIONS
MALFUNCTIONING
POSSIBLE CAUSE
SOLUTION
The pump works but does
not supply
1.
Excessive suction height.
2.
The suction piping is not airtight.
3.
Blocking of the pump
4.
The suction pipe is not fully
submerged inside the liquid to be
pumped.
5.
The suction filter is blocked
6.
The suction and/or delivery valves
have remained in open position for
the presence of a solid body
1.
Reduce the suction height.
2.
Restore seal of all gaskets of the
piping.
3.
Remove any blocking bodies
inside the pump.
4.
Fully submerge the suction pipe
so it does not suck air.
5.
Clean the suction filter
6.
Remove the solid body
Low flow rate
1.
The rotation speed is too low.
2.
The delivery pipe is undersized or
blocked
3.
Too many curves or delivery pipe
too long
4.
Use of non-‐reinforced collapsible
sleeve
5.
Damaged pipes
1.
Increase engine rotation speed, if
possible.
2.
Replace the pipe or clean it.
3.
Amend the delivery line
4.
Shorten or install a reinforced
pipe
5.
Replace
Excessive noise
1.Damaging of reducer
of speed
2.The pump is not safely fastened to the
parking stand
3.Suction is blocked
1. Repair of reducer by means of
intervention of staff authorised by
the Manufacturer
2. Ensure the parking stand is blocked
by means of the fixing pin with
insertion of the safety pin
3. Clean piping
There is water above the
diaphragm
1.
The diaphragm is broken
2.
The screws tightening the
diaphragm are loose
1.
Replace the diaphragm
2.
Tighten the screws
…
…
For the functioning defects of the supply motors see the attached instruction manuals.
