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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12. INSTALLATION
With regard to the use of engines coupled with pump, reference is made and the Standards given by the
manufacturers of the same engines are expressly recalled, attached to this use and maintenance manual.
Install the electric pump or motor pump units provided with metal frame on stable foundations and well
anchored to the ground.
The connection piping to the pump must be of flexible type or provided with flexible rubber bolt to dampen the
vibrations due to the button flow rate.
It is a good rule to prevent entry of large solids (max dimension 50 mm), that might break the diaphragm or the
connecting rod, by mounting a protective film at suction, supplied upon request.
The suction and delivery piping must have a diameter equal or above that of the suction and delivery ports of
the pump.
Avoid curves, elbows or bottlenecks as much as possible that might limit the inflow or flow rate of the liquid to
or from the pump.
Do not assemble shut-‐down valves: the pump is provided with clapet valves that work as check valves. In some
cases it may be useful to install a pressure relief valve.
Do not assemble flow choking valves on the delivery; to reduce the flow rate, envision a by-‐pass piping on the
delivery, with return to suction basin, adjusted by ball or shutter valve.
Ensure all joints are perfectly air sealed: check the threads, the gaskets of the adapters, of the ports, and of the
quick couplings.
Install the pump as close as possible to the fluid to be pumped, trying to decrease the length of the suction
piping as much as possible (the maximum suction height is of 7 metres); in this way, the priming time decreases
and greater flow rate is obtained.
The maximum head of the pump is of 15 metres of water column; greater hydraulic loads negatively influence
the functioning of the pump and limit the life-‐span of the diaphragm. For continuous uses, the total manometric
head must not exceed the 10 metres of water column.
The correct installation of the suction and delivery piping is assured by observing the flow direction recalled in
most versions using directional arrows on the suction and delivery nozzles or, however, verifying that suction is
on the nozzle with plug or air case.
In installing units with endothermic engine, ensure maximum inclination of the engine does not exceed the 35°
in transversal or longitudinal direction, in order to guarantee a correct lubrication value.
12.1 ELECTRIC CONNECTIONS
For versions with electric motor, the pump must be connected to an electric plant provided with earth system
according to local technical Standards in force.
For the single-‐phase version, keep to the current technical Standards.
Ensure the plate voltage corresponds to that of the power supply network.
Ensure the electric pump is disconnected from the electric power supply before carrying out any installation or
maintenance operation.
