Acoustic Insulation

Hertel knows a number of applications for acoustic insulation.

Acoustic casings and screens
Using an acoustic casing a sound level of 90 - 110 dBA can be reduced by 10 to a maximum of 25 dBA. The main applications for casings and screens are in gas and steam turbines, fans, compressors, electricity generators and diesel engines.
Hertel can carry out various measurements around the sound source, on which calculations can then be based to chart the sound nuisance.

The walls of the casing are of a sandwich design. On the outside there is galvanised steel with a coat of paint (if required) and if necessary a vibration layer of 5 kilos per square metre. The walls themselves are between 0.6 and 1.5 mm thick. The sound-absorption material is mineral wool with a thickness of between 40 and 120 kg/m3. This is covered with glass-fibre and a galvanised perforated piece of sheet steel. The pillars can also be made of aluminium or stainless steel.

Silence splitters
Large fans, exhaust systems from boilers, compressors and stacks can be a sound source causing sound nuisance. With a splitter the sound level and also the excessively high gas temperature (sometimes up to 250 ºC) can be reduced to the required levels.

Anti-vibration paste
Hertel Spuittechnieken (Spraying techniques) can dampen the vibration of metal surfaces by treating them with a dispersion of plastics and minerals with excellent damping properties. The rule of thumb here is: paste thickness twice the plate thickness. This anti-vibration paste is used in yacht-building, shipbuilding, façade cladding, ventilation ducts and panels.