Reducing Noise Transmission From Pipe Work and Services

Services Penetrations

Noise within pipes and ducts, where they penetrate the building structure, can be transmitted via the structure from room to room. The drawings below show methods of reducing this noise transmission using a) rock mineral wool 100kg slab as an isolating sleeve to a duct at the point of penetration and b) by continuing the rock mineral wool pipe section round a pipe through the point of penetration.

Pipe-Work

Rock mineral wool pipe sections and Tap-Warp can be used to considerably reduce noise emissions from pipes.

For optimum acoustic performance, the following principles should be followed:

• The insulation to be installed tightly around the pipe.

• Where suitable, Tap-Warp to be used in preference to pipe section.

• Rigid mechanical contact between pipe and outer cladding to be diligently avoided.

Although the sound reduction resulting from use of rock mineral wool pipe section insulation is significantly affected by the size of the pipe treated, the graph below shows a typical level of performance.

It should be noted that the sound attenuation obtained at low frequencies will be less for smaller diameter pipes. In some cases, a negative insertion loss may occur at frequencies below 250 Hz.