Interpump Group STANDARD HT Serie Instrucciones Para La Instalación página 8

INSTALLATION
- The pump should be installed in a horizontal position using the supporting feet or coupled directly to
the motor using the original fl ange provided.
- The base must be fl at and rigid so as to avoid bending and misalignments along the pump/motor
coupling axis.
- The pump/motor assembly cannot be fi xed rigidly to the frame or base, anti-vibration elements must
be set in between.
- Avoid installing and using the pumps near heat sources and/or in environments where condensation
may form as this affects the effectiveness of the lubricant contained in the pump.
- Make sure that the pump never operates dry even for short periods.
- For pumps with a built-in regulating valve or if the plant has the pressure regulating valve outlet
(BYPASS) connected directly to the feed inlet (IN) of the pump, the pump must not be operated in
BYPASS mode for more than 3 minutes, otherwise there will be a risk of damage to the seals and
valves caused by overheating.
For special applications, contact the Technical Department or the Customer Engineering Service.
FEED LINE
To ensure the pump works to its full potential, the feed line must have the following characte-
ristics:
- An inside diameter at least as large as the (IN) inlet on the pump manifold; along the pipe avoid fi tting
90° elbows, connections with other pipes, chokes, "T" connections, siphons, areas where air bubbles
may stagnate and cause head losses and cavitation.
- The lay-out must be such as to ensure, under all working conditions, a positive head of between min.
0.20 m (0.02 bars) and max. 100 m (10 bars) 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.
- It must be completely airtight and designed in such a way that its seal is guaranteed to last in time.
- It must be equipped with a fi lter of a suitable size, according to the capacity of the pump, and with
a fi ltering degree of min. 200 μm; the fi lter must be positioned as close as possible to the pump feed
attachment.
N.B. Even if the water to be used is clean, the fi lter must be installed to prevent foreign bodies present
in the plant such as swarf, welding slag or limestone scaling from entering the pump.
- Flexible piping should be used in the section closest to the pump so as to prevent forced connections
and the transmission of vibrations.
- It must be designed in such a way as to avoid the pump emptying even only partially when it comes
to a halt.
DELIVERY LINE
The following rules should be respected in designing the delivery line:
- 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 fl uid and to limit head losses.
- The fi rst section of piping connected to the pump must be fl exible, so as to avoid forced connections
and to isolate the vibrations produced by the pump from the rest of the plant.
- Use should be made of high-pressure pipes and fi ttings suited to the working pressures that may arise
under all operating conditions.
- A suitably calibrated overpressure valve must be installed, as well as the pressure regulating valve.
- 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.
- 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.
- A suitably sized pulsation damper should be installed for applications in which the pulsations produ-
ced by the pump on the delivery line have an undesired or detrimental effect.
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