Grit Blasting noise reduction
02-16-2007, 08:20 AM, (This post was last modified: 02-16-2007, 08:27 AM by TheZard.)
Grit Blasting noise reduction
Hi guys

I am new to the forum. I need help in the reducing the noise emitted from the grit blasting machine.

Currently we have a few units of grit blasting enclosures, manual operated, with pneumatic doors that slides up & the usual dust collectors etc. Some are from Vapor Blast. The doors are pneumatically operated & interlocked to prevent ergo issues to the techs using it.

Right now, blasting of some component parts yield a noise level of between 88 to 92 dBA. Techs need to put on ear plugs or muffers. We intend to reduce it to below 84 dBA so that hearing protection is not needed & to reduce overall noise generation in the shop floor.

We had identified that the weakest link is at the door & noise is 'leaking' from there & when measured at 1m distance, it can be as high as 94dBA at certain times. Since its sliding up, there's no insulation materials on the door itself as it will interfere with the mechanism & using an acoustic curtain is not recommended as we have handling issues.

Do u know of any other methods or refer me to links that talks on this subject? I knw that its more of a EHS issue so I do not knw if this is the right forum for me to post this.

Thanks in advance for yr help

02-18-2007, 02:51 PM,
RE: Grit Blasting noise reduction
Hi TheZard

Sign0016 to the Surface Engineering Forum.

No expert in this field. but know a few small gaps in any form of acoustic chamber will leak a suprising amount of sound. Making efforts to improve the door seal areas when closed may make a big difference.
02-22-2007, 03:19 AM,
RE: Grit Blasting noise reduction
Hi Gordon

Thanks. Understand that this issue might not be applicable to this forum.

Anyway want to thank u for replying. And to all those who are celebrating the Chinese New Year, Happy New Year !!

02-24-2007, 04:12 PM,
RE: Grit Blasting noise reduction
Hi TheZard

A good topic and I think it not out of place on this forum as it is a related problem to a surface engineering process.

Grit and shot blasting processes are very important processes within surface engineering in their own right and as surface preparation for many other surface engineering processes. I am sure you are not alone with the problem of noise from this process. The problem does seem to be overlooked sometimes, particularly when you have an adjacent process capable of generating much higher levels of noise like thermal spraying.
03-01-2007, 10:36 AM,
RE: Grit Blasting noise reduction

Modification to the sliding up door could be one of the solutions. There are some blasting machine with the design of a normal side openning door type. The sealing is better and once it is closed and locked tight, the sound level is relatively low. I have experience working with different typesa of balsting machine, small, big, chamber type..etc. generally, I find the latter one is better, though I did not physically measure the noise level.

Secondly, if you can see at the bottom of the blasting chamber, where the air host or brit host, depending you are using a pressure type blasting machine or pressure type; if the holes gap are large, this is also where the noise leakages. If you could do something to seal up these holes and not affecting air hose movement, it will cetainly help in noise reduction.

Also, the motor that drives the seperator, at time is the most noisiet part of the machine. Check that up if proper maintenace should be performed to the motor, and the suction system.

Some personal opinion hope it helps.



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