4
5.3.
Verifying maximum pressure
Working pressure
It is important to keep the sum of the inlet pressure plus the maximum pressure of the pump at zero capacity,
always lower than the maximum allowed working pressure (PN).
5.4.
Handling
Observe the accident prevention regulations in force. Risk of crushing. The pump may be
heavy. Use suitable lifting methods and always wear personal protection equipment.
Before handling the product, check its weight to identify suitable lifting equipment.
Position the hoist cables.
Take the pump out of its packing and check that it is in good condition. Check also that the plate data correspond
to those required. In the event of any anomaly, contact the supplier immediately, reporting the nature of the
defects.
5.5.
Minimum rated capacity
The pump must never operate with the discharge valve closed for more than 5 seconds.
Functioning for a long time at a lower level than the minimum allowed on the data plate may cause excessive and
dangerous overheating of the pump.
5.6.
Installation of the suction line
The intake of the suction line has to be equipped with a check valve (or non
-return valve) and
an intake filter.
Please use a suction line (2) having the same diameter as the suction port (1) of the pump. If the suction height
(HA) exceeds 4 m, however, it is recommendable to use a 25% larger diameter - including appropriate reducer
elements for the connectors.
The intake of the suction line has to be equipped with a check valve (3) - or non-return valve - and an intake filter
(4). The filter will keep away larger dirt particles contained in the water which might clog or even damage the
piping. The check valve will prevent the pressure to escape after the pump has cut out. Moreover, it simplifies the
venting of the suction line by enabling water to be filled in. The check valve with the intake filter - i.e. the entirety
of the intake section of the suction port - must be immersed by at least 0.3 m below the surface of the liquid to be
pumped (HI). This will prevent air from being taken in. In addition, please ensure a sufficient distance of the
suction line from both the ground and the sides of water courses, rivers, ponds etc in order to prevent stones,
plants etc from being sucked in.
5.7.
Installation of the pressure line
The pressure line (11) conveys the liquids to be discharged from the pump to the point of withdrawal. To avoid
dynamic flow losses, one should use a pressure line having at least the same diameter as the pressure port (5) of
the pump. To protect the pump from damage caused by pressure surges it is advisable to equip the pressure line
with a check valve (6) to be installed directly downstream the pump outlet.
Also, to facilitate maintenance work, it is recommendable to install a shut-off cock (7) after the pump and check
valve. This is a useful feature since it can be closed when the pump has to be dismantled and will thus prevent
the pressure line from draining to empty.
5.8.
Stationary installation
With regard to the electrical connection in the case of stati
onary installation, please ensure an
adequate visibility and accessibility of the plug.
The electric pump must ALWAYS be firmly fixed to a concrete base or to a metal structure of a size and weight to
suit the size and weight of the electric pump, using screws suitable for the fixing holes provided.
To reduce
vibration, it is recommended to apply an anti-vibration material - for instance a rubble layer - between the pump
and the installation surface.
Use the baseplate as a template for marking out the drill holes. Place the unit in the required position, insert a
punch or pin through the holes in the baseplate to mark the position of the drill holes.
Put the device aside, then use a suitable drill for pre-drilling the four holes. Place the device back into the desired
position, then fasten it there using suitable screws and washers.
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MSX_85-55 INOX_135-60 INOX_30098_30099_IM_180427.pdf 15 27.04.2018 09:06:10
