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Thread: Old air compressor silencer
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12th January 2024, 10:55 AM #1
Old air compressor silencer
I have an old twin cylinder belt driven Clisby 8cfm air compressor. After reading multiple threads on here around building an external housing or moving the air compressor away to reduce noise ive settled on adding some silencer filters as my first attempt to reduce db. Solberg filters seem to provide 5-15db reduction which seem fine for me as a first step. Ive found a model that seems to fit with a 3/6" bsp inlet thread which seems ok but some australian resellers are asking $140 in shipping domestically! well it seems domestic maybe they are ordering them in internationally first im not sure.
Anyway given that ive found what seems to be an appropriate filter here
Solberg FS-06-038 | Filter Silencer 3/8 Inch Mnpt 8 Cfm Max | 6WTK5 | Raptor Supplies Australia
before i go ahead with the above filters, I was wondering if anyone else has found a different manufacturer or supplier of noise reduction filters they would recommend as an alternative?
Cheers,
Nathan
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12th January 2024, 12:22 PM #2SENIOR MEMBER
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Looking at their website they list an Australian address but when you read their details they source and ship their stuff from the US, hence the ridiculous freight charge. The price is another clue, $55.48? Who sells stuff with anything other than a 0 or 5 as the last digit?
If you proceed I will be interested to see how they perform as I have a couple of Clisby's although I wouldn't spend $250 to silence them.
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12th January 2024, 01:22 PM #3
Yeah agreed I’m pretty surprised at the cost nearly $200 to silence them. I’ll keep looking around.
I have been in contact with them just to confirm matching model parts but only just now looking into resellers
Will keep digging for other options
Cheers
Nathan
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12th January 2024, 03:31 PM #4GOLD MEMBER
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I have exactly the same Clisby and I find it very quiet. I'd be amazed if those filters will give a 5-15dB noise reduction. In any case, that's a HUGE range of decibels. Why can't they give a more accurate figure for noise reduction? I don't know why they can't specify a single number of dB reduction at the rated CFM.
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12th January 2024, 06:42 PM #5
Maybe try a cheaper version and see if there is significant improvement first ?
https://www.ebay.com.au/itm/22591307...Bk9SR6Sp6cmfYw
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12th January 2024, 07:05 PM #6GOLD MEMBER
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Just a comment on those air filters. They are NPT not BSP so they will probably start in the threaded hole but when they get tight don't force them.
They are also designed primarily as an air filter to stop rubbish getting sucked in to the compressor.
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12th January 2024, 08:42 PM #7
Yeah my understanding is the standard filters like in that eBay link (I’ve already got something similar) do filter but not muffle or reduce the sound apparently
Not sure why such a large range of 5-15db but I’d be keen to test it, might not be loud for others but I have tinnitus and use 3M earmuffs etc to help reduce noise overall in workshop. I don’t use air compressor much because of the noise and need to a bit more so thought muffling it initially could be a good step.
These might have cheaper shipping but are $20 approx more per unit
Allied Witan Air Exaust Muffler: 0121000 | CAPS Shop
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12th January 2024, 08:59 PM #8GOLD MEMBER
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How about a DIY silencer? There's a ton of videos on YouTube on how to make one. Likely to be cheaper and more effective.
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12th January 2024, 10:21 PM #9
Are you sure a 3/8” BSPT screw-on filter is going to fit? Looking at your photo the original filters were a cleanable pan type but with the gauze elements and outer covers missing; in order to fit alternatives you’ll need to be removing the old filter housings. Have you confirmed that the brass slotted hollow screw thingies are definitely that thread size?
Here is a pic of what should be there:
IMG_0826.jpeg
Incidentally those Allied Witan mufflers aren’t what you need; they are exhaust mufflers used for when dumping air pressure from pneumatic valves or vessels; the airflow path is in the opposite directionNothing succeeds like a budgie without a beak.
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12th January 2024, 10:41 PM #10
Yeah I’ve got those wire mesh covers from Clisby directly but regarding the Solberg filters I reached out to both them and Clisby and they confirmed the part number in my
Original post will be compatible their response was
“The FS-06-050 would be suitable for the compressor. The cylinder head inlet thread is 3/8” BSP, you may need add a reducer or check if they have FS-06-038 available. “
But to answer your question no I’m not sure that other thread type would fit I’m just looking around
If that’s the cost to try reduce the noise with a compatible part then I guess I’ll give it a go eventually, I was hoping there may be another type available
Cheers
Nathan
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