Sound-proofing
During comparative tests between fibrocement piping and PVC-DWV piping, for
equal performances the PVC-DWV pipe requires a one inche in thickness acoustic
insulation of type BM1C.
Acoustics tests have demonstrated that fibrocement piping is 5Dba below cast
iron piping. Comparative sound measurements of noise generated by the water
flow in an asbestos-cement pipe and a cast iron pipe.
Because of the intrinsic properties of the asbestos cement pipe and to the
presence of rubber coupling at each joint, the noises of water flowing in
drainage pipe are not transmitted. The orientation and the composition of the
different crystals of cements and the asbestos fibers stop the distribution of
the acoustic waves. This quality is particularly sought in the pipings of the
high riser buildings.
Comparative sound measurements of the noise generated by the water flow in an
abestos-cement pipe and a cast iron pipe took place April 18, 2003 at Logard
plant located in Notre-Dame de Portneuf. The sound test were realized for the
account of Logard Inc.
A search in the literature showed that there are no normalized method to
evaluate the noise generated by the water flow in pipes. The methodology of
this study was elaborated to allow a direct comparison of the noise generated
by two types of pipe with a steady water flow. Because no normalized method
exists, the results of this study cannot be compared with the results of other
study realized in a different environment (trial set-up, water flow, pipe
mounting...).
The sound measurements showed that for a steady flow of 42 L/min, the noise
generated by the water flow in an asbestos-cement pipe that is 100 mm in
diameter is 5 dBA (averaged data) less that the noise generated by drainage of
water in cast-iron pipe with the same diameter.