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6.6
Protections
6.6.1
Moving parts
In accordance with accident-prevention regulations, all moving parts (fans, couplings, etc.) must be
accurately protected with special devices (fan covers, coupling covers) before operating the pump.
6.6.2
Noise level
The noise levels of pumps with standard supply motors are indicated in table 6.6.2 on page 109.
Remember that, in cases where the LpA noise levels exceed 85 dB(A), suitable HEARING
PROTECTION must be used in the place of installation, as required by the regulations in force.
6.6.3
Hot and cold parts
7.
INSTALLATION
The pumps may contain small quantities of residual water from testing.
We advise flushing them briefly with clean water before their final installation.
7.1
The electropump must be fitted in a well ventilated place, protected from unfavourable weather
conditions and with an environment temperature not exceeding 40°C. Fig. A.
Electropumps with degree of protection IP55 may be installed in dusty and damp environments. If
installed in the open, generally it is not necessary to take any particular steps to protect them against
unfavourable weather conditions.
7.2
The buyer is fully responsible for preparing the foundation. Metal foundations must be painted to
avoid corrosion; they must be level an sufficiently rigid to withstand any stress due to short circuits.
Their dimensions must be calculated to avoid the occurrence of vibrations due to resonance.
With concrete foundations, care must be taken to ensure that the concrete has set firmly and is
completely dry before placing the unit on it.
A firm anchoring of the feet of the pump/motor assembly on the base helps absorb any vibrations
created by pump operation. Fig. B.
7.3
Ensure that the metal pipes do not transmit excess force to the pump apertures, so as to avoid causing
deformations or breakages. Fig. B. Any expansion due to the heat of the pipes must be compensated
with suitable precautions to avoid weighing down on the pump. The flanges of the pipes must be
parallel to those of the pump.
7.4
To reduce noise to a minimum it is advisable to fit vibration-damping couplings on the intake and
delivery pipes and between the motor feet and the foundation.
7.5
It is always good practice to place the pump as close as possible to the liquid to be pumped. The
internal diameter of the pipes must never be smaller than that of the apertures of the pump. If the head
at intake is negative, it is indispensable to fit a foot valve with suitable characteristics at intake. Fig. C.
For suction depths of over four metres or with long horizontal stretches it is advisable to use an intake
pipe with a diameter larger than that of the intake aperture of the pump.
Irregular passages between the diameters of the pipes and tight curves considerably increase load
losses. Any passage from a pipe with a small diameter to one with a larger diameter must be gradual.
Usually the length of the passage cone must be 5 to 7 times the difference in diameter.
Check accurately to ensure that the joins in the intake pipe do not allow air infiltrations.
Ensure that the gaskets between flanges and counterflanges are well centred so as not to create
resistances to the flow in the pipes. To prevent the formation of air pockets, the intake pipe must slope
slightly upwards towards the pump. Fig. C.
If more than one pump is installed, each pump must have its own intake pipe. The only exception is
the reserve pump (if envisaged) which, as it starts up only in the case of breakdown of the main pump,
ensures the operation of only one pump for each intake pipe.
During pump operation, keep well away from the moving parts (shaft, fan, etc.) unless it
is absolutely necessary, and only then wearing suitable clothing as required by law, to
avoid being caught.
As well as being at high temperature and high pressure, the fluid in the
system may also be in the form of steam!
DANGER OF BURNING.
It may be dangerous even to touch the pump or parts of the system.
If the hot or cold parts are a source of danger, they must be accurately protected to avoid
contact with them.
ENGLISH
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