Noise Emission; Derating For Operative Ambient Conditions - Mase MPL 111 S Manual De Uso Y Mantenimiento

2.5 N
OISE EMISSION
The values listed are emission levels and not necessarily
safe operating levels. Although there is a correlation between
emission and exposure levels, this cannot be reliably used
to establish whether or not further precautions are required.
Among the factors which affect the effective level of exposure
MODEL
Guaranteed acoustic power level L
The measurements were made with the generator running and in accordance with Directive 2000/14/EC, and regarding the place of testing,
the measuring conditions and the instruments in accordance with ISO 3744 of 1995. Measurement uncertainty values: +1dB.
Acoustic pressure level at the operator
station L
pA
The measurements were made with the generator running and in accordance with Directive 98/37/EC
2.6 D
ERATING FOR OPERATIVE AMBIENT CONDITIONS
Diesel engines
Important: the outputs of Diesel engines for stationary
applications refer to the following standard ambient
conditions in agreement with ISO 3046/1 Standard
- ambient temperature +25 °C
- ambient pressure 1000 mbar (750 mm/Hg,
corresponding to 0 m. above sea level);
- relative humidity 30%.
Synchronous generators
The ambient conditions for reference for synchronous
generators and stationary applications, in agreement
with IEC 34 standards, are the following:
- ambient temperature 40 °C
- altitude 1000 metres above sea level (674 mm/Hg).
Table with derating estimates for aspirated and turbocompressed Diesel engines
(for more information about the type of intake, see "Table. Technical Features" Chap.2.4)
The two coefficients K1 and K2 must both be multiplied to the rated power of the generator to obtain the power at
ambient conditions different to standard conditions.
Altitude (m.a.s.l.) a 25°C
Reduction factor (K )
1
for naturally aspirated engine
Reduction factor (K )
1
for turbo aspirated engine
Ambient temp. (°C) a 0 m.a.s.l.
Reduction factor (K )
2
for naturally aspirated engine
Reduction factor (K )
2
for turbo aspirated engine
Resultant power = Rated power x K
EXAMPLE: Machine Operation - power: 100 kVA a 35°C a 1000 m.s.l.
100 x 0.96 x 0.92 = 88.3 kVA
of the workforce are the characteristics of the workplace,
other sources of noise, such as the number of machines
and other adjacent processes, and the time an operator is
exposed to the noise. Moreover, the permitted exposure
levels may vary from country to country. Nonetheless, this
information allows the machine user to better evaluate the
danger and risk.
WA
in accordance with Directive 2000/14/EC
In accordance with Directive 98/37/EC
For installation and operating ambient conditions other
than those indicated for reference, appropriate "derating"
of the power supplied by the unit must be performed.
The impact of every factor described in this section must
not be considered individually but in combination with
the other factors.
The derating of synchronous generators is less
demanding than for Diesel engines; inasmuch, the
derating of the power generator in general coincides with
the derating of the Diesel engine.
Particular deratings may be determined on the basis of
the effective conditions of use.
For information: the following Table indicates the derating
values for aspirated and turbocompressed engines.
0 500 1000 1500 2000 2500 3000
1 0,95 0,89 0,83 0,76
1 0,96 0,92 0,88 0,83
25° 30° 35° 40° 45°
1 0,98 0,96 0,95 0,93
1 0,98 0,96 0,94 0,92
x K
1 2
MPL 111 S
MPL 111 S
97
83
0,74 0,68
0,79 0,75
50°
0,91
0,90
GB
dB(A)
dB(A)
GB
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