ACOUSTICS

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ACOUSTICS

Noise in buildings is considered to be detrimental to health and the quality of life. Where efforts are made to attenuate the sounds coming from the street, the perception of the sounds emitted within the buildings are worsened. Heat insulation policies aiming at reducing energy consumption will also heighten these perceptions. When comparing performance of drainage materials, acoustic performance is reckoned to be second only to fire safety. Cast iron pipe systems have intrinsic acoustic properties. Owing to the development in accessories equipment, they offer outstanding performances.

 

What is the meaning of “equipment noise” exactly?

Noise emitted by waste water pipe systems is classified under the regulation in the «equipment noises». Noise originating from pipe systems is due to the sound energy produced by water/air turbulence, but mostly by the mechanical effect of the water-flow on the internal pipe walls.

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AİRBORNE NOİSE (A)

AİRBORNE NOİSE (A)

When a material is dense and thick, the pipe walls prevent air transmission; as is the case with cast iron which offers intrinsic acoustic properties.

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Structure-borne noise (B)

Structure-borne noise (B)

When the noise produced in a pipe is not transmitted by the air, the residual noise is transmitted by structural vibrations.

Whilst the mass of the cast iron limits the vibratory level, the junctions and fixing to the building will propagate noise. Objective: Dampen the vibrations at the connections with the solid structure

Vibrations transmitted to the building structure are dampened by installing “sound absorbers” and by combining:

  • Couplings equipped with elastomer sealing gaskets which reduce metal to metal contact and prevent the transmission of vibrations.
  • If required, rubber lined insulating brackets or acoustic dampeners, and stack supports equipped with elastomer gaskets.
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COUPLINGS

PAM-Global cast iron piping systems are connected to each other by mechanical metal clamps by transmission method. The clamps are equipped with rubber seals to guarantee stretch and water impermeability.Stainless steel clamps with different functions are available and standard EPDM or NBR seals can be used.When high pressure load resistance is required, pressure clamps or threaded connection clamps are recommended.

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PAM-GLOBAL ACOUSTIC DAMPENER

The acoustic dampener is designed to reduce structure-borne noise propagating through connections between the pipe system and the building. This accessory, made of a stainless steel casing surrounding an elastomer shock absorber, is fitted between the back of the bracket and the structure (wall, ceiling, etc...). It can be used on any cast iron pipe bracket from DN 50 to DN 150, installed horizontally or vertically. With PAM-GLOBAL® dampener, such low values as 5 dB(A) in a 2 l/s flow rate can be achieved independent of how tight the bracket is screwed.

REQUIREMENTS DEFINED BY DIN 4109 AND VDI

Drainage installations must be designed in accordance with DIN 4109/A1. This standard defines the expected requirements for noise control with the aim of protecting people in residential rooms from unreasonable nuisance caused by sound transmission.

DIN 4109-1989 specifies the expected requirements regarding the maximum noise level for rooms requiring noise insulation. These include living rooms, bedrooms, workrooms and classrooms. However, it only sets a minimum requirement. The VDI Guidelines 4100 define 3 sound insulation levels (SSt).

These 3 levels can cover all sound insulation requirements and they are to be promoted between all actors involved in building projects including further occupants on the basis of private law.

To avoid subsequent disputes it is highly recommended that the sound insulation level requirements (SSt) should be stipulated in the contracts

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