NCF fan
EN
• The dimensions of the environment in which the fan
is installed.
• The presence of static elements near the fan (e.g.
walls).
• The presence of other machines that are also
sources of noise emission.
Nederman invites the user to measure ambient noise
levels. It should be noted that the presence of other
operating machines generates a “superimposition of
effects” and resonance that multiply ambient noise.
In addition, in cases of restricted environments, or if
the fan is installed against walls, the effect of rever-
beration and resonance on structures (walls and ceil-
ing) is “exponential”.
The definition of the risks to workers of exposure to
noise is not the responsibility of Nederman, which lim-
its itself to indications of values, levels of uncertainty,
standards or criteria used for noise emission measure-
ments.
As envisaged by applicable legislation, it is the user
that must assess the level of exposure of operatives
to noise emissions using its own specific procedures,
identifying:
• Sources of noise and their relative importance.
• Average exposure times for each operative.
• The level of direct and reflected noise.
• The noise transmitted by structures and not
through the air.
If exposure to noise, in terms of sound pressure, ex-
ceeds 80 dBA, the employer must provide operat-
ives with PPE for the hearing, such as earplugs or ear-
muffs. If exposure is equal to or higher than 85 dBA,
the employer must take all possible action to ensure
that PPE for the hearing is effectively used.
3 Description
3.1 Intended use
The NCF fan is a centrifugal fan designed for use in all
types of industrial process and ventilation systems,
mounted indoor as well as outdoor.
The NCF fan must be used in the flow range specified
in the performance diagrams. Use of the fan with
flows lower than the minimum value indicated in the
diagrams may cause unstable fluid dynamic operation
and vibrations.
3.2 Prohibited uses
Below is a list of specific uses that are prohibited:
• Operation of the NCF fan with non-gaseous fluids or
with fluids with characteristics different from those
defined to be used with the fan, since structural
damage may be caused to the fan with the possible
risk of injury to persons and/or damage to things;
• Operation of the NCF fan in all types of system with
pressures (present or even partially generated by
the fan) greater than 1.2 times standard atmospher-
ic pressure, since structural damage may be caused
to the fan with the possible risk of injury to persons
and/or damage to things;
• Operation of the NCF fan in all types of systems clas-
sified in accordance with the ATEX directive and
that move potentially explosive fluids, since risks of
ignition/explosion may arise with possible injury to
persons and/or damage to things;
• Operation of the NCF fan in industrial chemical
plants where the fluid moved is highly corrosive
for the materials used in fan construction, or in the
presence of highly toxic fluids where the construc-
tion methods of casings and the types of seal used
are not suitable for this specific application, since
structural damage may be caused to the fan with
the possible risk of injury to persons and/or damage
to things;
• Operation of the NCF fan in mining industry plants
and with underground installations, since addition-
al risks not considered in the use of the fan above
ground may arise, with possible injury to persons
and/or damage to things.
3.3 Life cycle of the NCF fan
The reliability of all components is guaranteed if they
are properly maintained and if Nederman original
parts and accessories are used.
For safety reasons, guards in electrowelded wire must
be replaced every 2 to 3 years.
If the NCF fan is used at constant speed for two work
shifts every day equivalent to 16 hours, calculated for
250 days per year, the expected life cycle for the im-
peller is equivalent to 40,000 hours, ie., 10 years.
In the specific case of operation at variable speeds,
the impeller life cycle must be assessed on a case-by-
case basis, and must also be agreed with Nederman.
Even if it has never been used, an impeller that has
been stored for more than ten years must be checked
by Nederman for possible defects before it can be
used.
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