Hi Malik

We would need MUCH more information about the process and for the purpose of this reply I have assumed that this is about cleaning out bottles rather than the glassmaking process of blowing.

For starters are the bottles glass, plastic or made from something else.

Can you identify the noise source or confirm that it is mainly about the compressed air or other gas being used to "wash" the bottles?

....and describe the construction of the surrounding environment so that we have an idea of how noise might be reverberating.

Does you phoner indicate what type of decibels it is recording e.g. dB(A) or dB(C) + do you have any idea of the tolerance so is 100 dB eg. in a range of 90-110, 95-105, or perhaps much tighter.

Finally, is this intermittent or relatively continuous through a shift?

Edited by user 25 May 2021 12:50:24(UTC)  | Reason: Edit to clarify response

Sorry, about I am very careful about opening links to sources whose security is unknown.

So, starting point, can you enclose the three machines in boxes that would restrict how much noise is transmitted to the workers' ears? 

If the process is automated, then tunnels at entry and exit points, where you might need some absorptive material.

Might be possible to reduce the air pressure and thence the noise.

Nature of building materials is such that you might well be getting reverberation but there might be hygiene reasons why you want e.g. ceramic floor tiles.

The Health and Safety Executive used to have lots of examples of practical methods of noise control on its website www.hse.gov.uk and you should find various guidance from suppliers on the internet.

Key thing perhaps is to assess what each individual's noise exposure over a continuous period against whatever legislative or other standard you work to. 

So, in the UK that would usually be time weighted across an 8 hour shift - do a 6 or 10 hour shift then the time weighting tells you what the 8 hour exposure would amount to.

If your phone is relatively accurate in measuring the dB(A) then you are faced with what at first sight look like very high noise levels. Might want to bring in a specialist with more sophisticated measuring equipment to give you a clearer picture of exposure.

That said the price tag of such equipment has dropped dramatically over the last decades. In the early 1980s each of HSE's 21 operational regions had one or two "Nominated Noise Inspectors" who each got a state of the art integrating sound level pressure meter at £3500. so about 10 times the cost of what all the other front line Inspectors had.

P

Thank you gentlmen,

Let me clarify this, I am from Palestine, unfortuantelly we are not familiar with OSH as the UK and other countries.

Also we dont have safety culture nor regulations that pushes duty holders to apply OSH in their workplaces. But when there is a compalint from workers or neighbours they react.

As happening with the factory who asked my to solve the noise problem for him.

Thank you for your comments, I am looking to select the most reasonably practicble solutions, for example enclosing machines is difficult as they are very close to each other...

Also, the three machine are separated in one section which can be considered as a big enclosure, now I am thinking of mounting sound absorbing panels and sound diffusers in the bottle blowing section.

Upgrading the mufflers/vent silencer on the machines to reduce noise as low as possible

What other solutions do you advice please?

KR