Interpump Group VHT Serie Instrucciones De Uso página 12

min. 0.20 m (0.02 bars) and max. 80 m (8 bar) measured at the pump feed inlet; this minimum value
is valid for cold water having a temperature of up to 20°C, for higher temperatures, see the graph on
the last page.
The pumps can also work at a lower supply pressure, under certain operating conditions authorised by
Interpump Group Technical Department.
3.3 - It must be completely airtight and designed in such a way that its seal is guaranteed to last in
time.
3.4 - It must be equipped with a filter of a suitable size, according to the capacity of the pump, and with
a filtering degree of min. 300 µm; the filter must be positioned as close as possible to the pump feed
attachment.
N.B. Even if the water to be used is clean, the filter must be installed to prevent foreign bodies present
in the plant such as swarf, welding slag or limestone scaling from entering the pump.
3.5 - Flexible piping should be used in the section closest to the pump so as to prevent forced
connections and the transmission of vibrations.
3.6 - It must be designed in such a way as to avoid the pump emptying even only partially when it
comes to a halt.
4 - DELIVERY LINE
The following rules should be respected in designing the DELIVERY line:
4.1 - The inside diameter of the piping must be correctly sized according to the maximum pressure and
capacity so as to ensure the appropriate speed of the fluid and to limit head losses.
4.2 - The first section of piping connected to the pump must be flexible, so as to avoid forced connections
and to isolate the vibrations produced by the pump from the rest of the plant.
4.3 - Use should be made of pressure gauges capable of withstanding the pulsating loads typical of
piston pumps, installed in such a way as to measure the pressure directly at the pump manifold.
4.4 - In the design phase, consideration should be given to the head losses on the line, which result in
a drop in working pressure with respect to the pressure measured at the pump.
4.5 - A suitably sized pulsation damper should be installed for applications in which the pulsations
produced by the pump on the delivery line have an undesired or detrimental effect.
Use high-pressure pipes and fittings suited to the working pressures that may arise
under all operating conditions.
Install a suitably calibrated overpressure valve, as well as the pressure regulating
valve.
5 - MAINTENANCE
5.1 - System maintenance work should be done within the time intervals laid down by the system
manufacturer, who is responsible for the entire assembly in accordance with the law.
5.2 - Correct maintenance prolongs the life of the pump and maintains its maximum performance in
time.
5.3 - All maintenance work should be done by specialized, authorized staff.
5.4 - The pump and its components are to be assembled and disassembled exclusively by authorized
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