General Pump HF Owner Manual - Manual (Page 8)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
Page 8
kind of one-way valves.
9. In the case of a feed tank, make sure that
dimensions of the tank and the water minimun
level do not give rise to turbulence at the tank
outlet port, which, in turn might create cavitation
in the pump.
10. Do not connect the by-pass line from the valve
directly to the pump suction line.
11. Connect the bypass line from the valve directly to
the feed tank and make sure that both the bypass
and tank feeding flows could not give rise to
turbulence at the tank outlet port, which in turn,
might create cavitation at the pump. Proper baffle
plates should be provided inside the tank.
12. Before connecting the suction line to the pump
inlet port make sure the pipe is perfectly clean.
9.5 Filtration
All pumps require a suitable filter. The filter should be
installed as close as possible to the pump, should allow
easy inspection and have the following characteristics:
1. The filter capacity should be at least three times the
rated pump volume.
2. Filter port diameters should not be smaller than the
pump inlet ports.
3. Filtration degree in between 50 and 80 mesh (360
to 200 microns).
IMPORTANT NOTE: In order to properly safeguard the
pump it is very important to plan cleaning of the filter
with a frequency depending on the water quality,
filtration degree and number of hours of each
application. It is recommended to use filters with a
clogging signaling device.
9.6 Delivery line
For a correct delivery line comply with the following
instructions:
1. The first length of delivery hose should be flexible
in order to isolate the pump vibrations from the
rest of the system.
2. Use only high pressure hoses and fittings able to
guarantee the largest possible safety margins in
any working conditions.
3. A suitable relief valve should be installed in the
delivery line.
4. Use glycerine filled pressure gauges, as the most
suitable for pulsating loads.
5. When designing the delivery line, take into proper
account the unavoidable drop in pressure, due to
its length and size.
6. If necessary, the effects of the pump pulsations
can be reduced by installing a proper pulsation
dampener in the pressure line.