Page 19 - INCOLA EXCLUSIVE DATA CATALOGUE

INCOLA Soundproof Piping Systems

2.5.2 Structure-borne Noise

Structure-borne noise is generated by flowing wastewater hitting the surfaces it contacts when
changing direction. When the water hits the surface of the pipe, it creates vibrations along the
wall, pipe, and then the bridge and fittings located between the pipe and the room wall. The
sound energy carried by air particles enters the room and is perceived as a physical sound.

2.5.2.1 How to Reduce Structure-borne Noise?

A structure-borne noise can be reduced:

• By preventing direct contact of pipes with walls by using insulation material in
between.
• By preventing mass sound transmission into the wall by using specially
designed air channeled acoustic clamps. (VESBO Acoustic Clamp)
• By reducing pipe vibration with a fixed clamp with elastomeric gasket.

2.6 Noise

A sound that possesses irregular frequencies is described as noise.

2.6.1 Noise Measurement and Evaluation

A sound meter measures loudness while a sonometer measures the frequency of a sound. A
sound meter has three filters - “A”, “B” and “C”. These filters measure loudness as perceived by
the human ear.

• Filter “A” measures the most similar sound level detected. Noise
effect is measured in dB(A).
• Filter “B” is in the middle of “A” and “C”, and not widely used.

• The curve of filter “C” is more linear than that of filter “A”, so it is
used for very high frequencies.

2.6.2 Noise Intervals and Their Effects on Health

Loud and noisy sounds have negative effects on health. They may even cause physical and
psychological effects resulting in mental disorders.

dB(A): Decibel value alone is not adequate in measuring the effect of noise on the human ear
as ear sensitivity may vary for different frequency levels. For this reason dB(A) values are used
to measure the sound intensity according to the frequency levels.

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