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Idiomas disponibles
Idiomas disponibles
OPERATING AND MAINTENANCE MANUAL
MD SERIES DIESEL FUEL PUMP
9. CONNECTING THE PIPES
The pipes must be fixed and anchored to their supports and connected so that they do not
transmit stresses, voltages or vibrations to the pump. (See Fig. 4).
The internal diameter of the pipes will depend on their length and the flow rate to be used.
This must be chosen so that the speed of the liquid does not exceed 1.4/1.5 m/s in the
suction pipe and 2.4/2.5 m/s in the delivery pipe. The diameter of the pipes must not be
less than the diameter of the pump inlets / outlets.
Make sure that the inside of the pipes are clean before installing them.The suction pipe
must be: (See Fig. 5)
• as short as possible, without pinches or sharp changes in direction
• perfectly sealed and able to withstand the vacuum created by the pump suction
• directed upwards towards the pump to prevent the formation of air pockets that could
prevent the pump from being primed or cause it to lose its priming.
In order to use it as a suction lift pump, install a bottom valve with a suction strainer at the
end of the suction pipe, which must be immersed in the water at a depth of at least twice
the diameter of the pipe.
In the case of a self-priming pump, the bottom valve can be replaced by a check valve
mounted directly on the suction inlet. In order to use it as a positive head pump, a gate
valve must be installed on the pipe upstream from the pump. (See Fig.3) The delivery pipe
must be fitted with a check valve (to protect the pump from water hammer and to prevent
the backflow of liquid from the pipe through the impeller) and a flow regulator gate valve
downstream from the check valve in order to regulate the flow, the head and the power of
the pump. (See Fig.3) In the case of self-priming electric pumps for high priming-suction
heights, (greater than 5 m but anyway less than 9 m) the delivery pipe must have a straight
and vertical section at least 1 m long.
10. ELECTRICAL CONNECTION
For all the pumps, the electrical power cables must be sized according to their length
and the current indicated on the pump data plate. Prepare the ends of the power and
ground conductors so that the conductors cannot slip off during installation when the
corresponding terminal block nuts and the ground screw are tightened.
The electrical connection must anyway be carried out by qualified personnel, in
compliance with the current regulations in the country in which the equipment is used.
Make sure that the voltage / frequency of the mains power supply is the same as the one
indicated on the data plate of the electric pump: then connect the terminals following the
diagrams shown in Fig. 8 and / or located inside the terminal box cover. Earth the electric
pump using the specific terminal. Make sure that the mains power supply is properly
earthed and that therefore the electric pump is earthed.
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