| Acoustic panels and curtains |
| Noise source |
Intervention |
Follow‐up |
Initial noise level |
Noise level after |
Dose before |
Dose after |
Reference ID |
| Production noise |
Door |
not reported |
85 dB |
79 dB |
|
|
Morata 2015 |
| Blast furnace |
Control rooms were redesigned in order to improve acoustical condition: installation of a UPVC window with vacuumed double‐layered glass 80 x 80 cm and double wall for entrance by 90° rotate plus a 2.0 × 1.2 m steel door without glass |
not reported |
80 dB |
52.6 dB |
|
|
Golmohammadi 2014 |
| Blast furnace |
In rest room wall facing to the furnace was made from the armed concrete with a thickness of 20 cm, length of 9 m, and height of 3 m and was located in the entrance by 90° rotate |
not reported |
86.1 dB |
58.4 dB |
|
|
| Blast furnace |
Control room and rest room redesigned to improve acoustical condition |
not reported |
|
|
236% (unspecified) |
130% (unspecified) |
| Product impact on multi‐head weigher |
Fitted flexible PVC curtains |
not reported |
92 dB |
88 dB |
|
|
HSE 2013 |
| Packaging lines |
Fitted acoustic baffles to ceiling |
not reported |
Above 90 dB |
below 90 dB |
|
|
| Noise from hearing protection zones affecting quieter areas |
Erected acoustic panels and automatic doors between hearing protection zones and quieter areas |
not reported |
Above 90 dB |
below 85 dB |
|
|
| Filler pump |
Improved efficiency of pump and added acoustic hood |
not reported |
96 dB |
86 dB |
|
|
| Compressed air in bottle transportation |
Acoustic side panels fitted |
not reported |
85–86 dB |
73 dB |
|
|
| Product impact on hoppers |
Flexible PVC curtains fitted |
not reported |
Above 90 dB |
83 dB |
|
|
| |
Number of cases: 10 |
mean before |
mean after |
mean reduction |
|
| noise level dB |
88.3 |
77.2 |
11.1 |
|
| Dose % (unspecified) |
236 |
130 |
106 |
|
