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Sound Insulation
2.5.1 Airborne Noise
An airborne noise, which also can be heard from outside, is generated when wastewater
contacts various surfaces. The sound is transmitted to the air in waves and indirectly
transferred from the pipe to the room as a result of turbulence in the flowing water. Sound
waves in the room cause vibrations in structural compounds passing through the room.
Figure 6. Airborne Noise
The surface of a wastewater pipe vibrates with the water flow. The vibration on the pipe
depends on several variables such as pipe mass, pipe material characteristics and sound
absorption degree of the material.
Airborne noises can be described as sound waves spreading into the air. Solid compounds
transmit airborne noises.
2.5.1.1 How to Reduce Airborne Noise?
An airborne noise can be reduced:
• By using pipes and fittings made of special raw
material that has sound absorption features
(Incolene)
• By using thick and high density pipes and fittings.
• By optimizing the use of fixed clamps.
Figure 7. Reducing Airborne Noise
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