VDI 3733-1996 PDF

Scope: The purpose of this Guideline is to impart the important knowledge concerning the correct application of sound regulations in the planning@ design and laying of pipes with mostly round cross-section in industrial plants; it is broken down according to the criteria generation of sound@ sound transmission@ sound radiation and sound reduction Firstly@ the noise mechanisms are explained and advice given on the determination or use of sound Parameters; the following@ for example@ may be important: ?? the sound power produced by the flow in the pipe; ?? the sound power introduced into the fluid and the pipe wall by external sound sources; ?? the sound velocities in the fluid and the pipe wall; ?? attenuation of the sound transmission in the fluid and in the pipe wall; ?? attenuation of the sound transmission in the fluid by deflectors@ branches@ sudden changes in cross-section and fittings; ?? the diminishing sound power in the pipe with increasing pipe length; ?? the natural@ limit@ circumferential expansion and pass frequencies of the pipe; ?? the radiation efficiency (or logarithmic radiation efficiency) of the pipe; ?? the sound reduction index of the pipe wall.

VDI 3733-1996 history