Noisy industrial hall, Klepp in Rogaland
| Northcut at Klepp has a large industrial hall of 350 m2 and 6 metres ceiling height. Their problem was a lot of disturbing noise and reverberation from overhead travelling cranes, compressors and industrial tools. |
This is what it looked like before measures with sound-absorbing panels
We measured a reverberation time of 2.6 Tsek during sound measurement. The maximum allowed reverberation time in this production building is 1.2 Tsek, according to NS 8175:2019, which corresponds to sound class C. Furthermore, sound pressure measurements show that this is approx. 80 dB. This means that you must adhere to the Norwegian Labour Inspection Authority's guidelines for working hours in such circumstances. For example, a maximum of 4 hours of work with hearing protection. HSE in relation to notification and communication must be taken care of for safety reasons. The maximum permitted sound level/sound pressure is 47 dB in sound class C.
To fulfil the required reverberation time of 1.2 Tsec and sound level/dB, we calculated that it had to be mounted 190 metres in total2 High-quality sound-absorbing panels, sound absorption class A. Together with the customer, we chose the absorbent EiraTM 40mm white, in the size 60x120x4 cm.
After installation, we took a new sound measurement and the reverberation time is now 1.07 Tsek and the sound pressure is down to 45 dB. Which is well within the requirement.
The customer is very pleased with the location, appearance and acoustics in the room. It has become a completely new working day for those who work here and stand in noisy surroundings every single day. This is a good example of an employer who takes employee HSE seriously and invests in a thorough process.
The right process is: acoustics sound measurement, calculations in accordance with current regulations and the Norwegian Standard, good planning and delivery of the right amount and absorber as well as placement and installation.
We thank you for the assignment.
This is how the finished result turned out.
PS! Compressor noise is also noticeably lower
