Hospital silencer project.

larkboy
Long Standing Member

Posts: 347

Hospital silencer project. Nov 14, 2016 23:43:25 GMT tonyqj likes this

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Post by larkboy on Nov 14, 2016 23:43:25 GMT

Posted about this on the other place but as I never go there now I thought I'd post details here. I've recently built myself a stainless steel hospital type silencer. It's a 3 chamber design with the dimensions a combination of scaling and educated guesswork based on the surprisingly limited info I found online. I've just made a mounting bracket to weld to the swim and intend to fit it over xmas as I'm off for a fortnight. If anyone's interested in any details then I'm happy to share, but probably best to wait until I find out if it works...!!😀

drive.google.com/open?id=0B-Jq7wg-_YOQOUJoS09POTFkdlU

drive.google.com/open?id=0B-Jq7wg-_YOQd3NGSFVuRjEweDQ

drive.google.com/open?id=0B-Jq7wg-_YOQNEVvcGZrbGdFTk0

quaysider Long Standing Member Posts: 3,463	Hospital silencer project. Nov 15, 2016 6:20:48 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by quaysider on Nov 15, 2016 6:20:48 GMT hse head on... those don't look like steels to me... MIND your toes! lol
	narrowboatellis.blogspot.co.uk www.narrowboatellis.com

smileypete
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Posts: 834

Hospital silencer project. Nov 15, 2016 18:48:43 GMT phil70 likes this

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Post by smileypete on Nov 15, 2016 18:48:43 GMT

Cool.

ISTR they use perforated pipe and glass fibre wadding to break up the exhaust pulses and then absorb the sound.

Looks like Mr Google has some good info:

www.google.co.uk/search?q=exhaust+silencer+cross+section&num=100&tbm=isch&tbo=u&source=univ&sa=X

Last Edit: Nov 15, 2016 18:51:52 GMT by smileypete

Deleted Deleted Member Posts: 0	Hospital silencer project. Nov 15, 2016 19:22:36 GMT via mobile TonyDunkley and patty like this Quote Select Post Deselect Post Link to Post Back to Top Post by Deleted on Nov 15, 2016 19:22:36 GMT A Hospital Silencer sounds like some sort of wonder drug you inject all the patients and they shut up.

Deleted
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Posts: 0

Hospital silencer project. Nov 15, 2016 20:11:23 GMT via mobile

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Post by Deleted on Nov 15, 2016 20:11:23 GMT

Nov 15, 2016 18:48:43 GMT smileypete said:

Cool.

ISTR they use perforated pipe and glass fibre wadding to break up the exhaust pulses and then absorb the sound.

Looks like Mr Google has some good info:

www.google.co.uk/search?q=exhaust+silencer+cross+section&num=100&tbm=isch&tbo=u&source=univ&sa=X

Depends on the silencer.

I had these on two different Yam Twins.

m.facebook.com/Gibson-Exhausts-256654546320/

Hospital quite they were not

larkboy
Long Standing Member

Posts: 347

Hospital silencer project. Nov 15, 2016 22:56:42 GMT

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Post by larkboy on Nov 15, 2016 22:56:42 GMT

Nov 15, 2016 6:20:48 GMT quaysider said:

hse head on... those don't look like steels to me... MIND your toes! lol

😀 Fortunately it was home time when I took the pics, I feel uncomfortable not wearing toe tectors at work, bit like not wearing a seat belt driving.

quaysider
Long Standing Member

Posts: 3,463

Hospital silencer project. Nov 16, 2016 6:25:48 GMT

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Post by quaysider on Nov 16, 2016 6:25:48 GMT

between you and I, I've stopped wearing them at work... every pair I tried just caused a bunion as I spend way too much time crawling around the floor ... I've sneaked in my old morrell walking shoes (covered in paint) and no one has noticed)... I take EXTRA care now!!! - I'm sure my mother used to say "do as I say not as I do" lol.

narrowboatellis.blogspot.co.uk

www.narrowboatellis.com

Ditchcrawler
Member

Posts: 95

Hospital silencer project. Nov 16, 2016 20:56:19 GMT

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Post by Ditchcrawler on Nov 16, 2016 20:56:19 GMT

Nov 16, 2016 6:25:48 GMT quaysider said:

between you and I, I've stopped wearing them at work... every pair I tried just caused a bunion as I spend way too much time crawling around the floor ... I've sneaked in my old morrell walking shoes (covered in paint) and no one has noticed)... I take EXTRA care now!!! - I'm sure my mother used to say "do as I say not as I do" lol.

I once pulled a chap up for wearing a pair or brogues Offshore, wrong! www.hivis.net/4674/safety-corporate-workplace-and-leisure-footwear/psf-exec-brogue-safety-shoe/?productstyleid=10685&utm_source=googlebase&utm_medium=shoppingfeed&gclid=CLGGjc2UrtACFQ4R0wod-gQF1g

larkboy
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Posts: 347

Hospital silencer project. Jun 4, 2017 15:13:19 GMT

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Post by larkboy on Jun 4, 2017 15:13:19 GMT

Finally been online and ordered the stainless pipe fittings I need to fit my homemade hospital silencer. Shame they all come in 316 as opposed to the cheaper 304 grade. £54 for 2 1 1/2" bsp nipples, a 45 degree elbow and a matching socket. It does mean it will be installed in the next couple of weeks as we're in for blacking at the end of July and I want all welding done well before then. I will post pics of the installation as I do it, together with some other mods in the engine bay.

larkboy
Long Standing Member

Posts: 347

Hospital silencer project. Jul 15, 2017 18:02:17 GMT

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Post by larkboy on Jul 15, 2017 18:02:17 GMT

Finally, today, the silencer was installed without too many hiccups. Got the old one out last night and got everything ready for the big push today. First had to weld in a piece of folded angle with a bracket to properly mount the bowl filter for the Hurricane boiler and it's copper pipe. It's now how I should have done it when I installed the boiler, and looks much better as a result. Next it was a trial fit for the silencer and a modification of the mounting bracket as the original configuration fouled the angle I'd just fitted. Once everything had been trial fitted it was time to wrap the silencer before final fit. Once this was done it was time to slide it into position and connect the flexible pipe up, after which all bolts were tightened and then the bracket and through hull pipe were welded in place. Once this was done it was time for a clear up and a test fire! What a result, it works better than I could have hoped, to the point where I'm now going to have to fit sound deadening panels to the underside of the deck and engine bay covers to silence the clatter from the engine. The noise is so much quieter that long periods at the tiller will be transformed and my hearing should benefit substantially.

drive.google.com/open?id=0B-Jq7wg-_YOQWTlxSXVfbWsyR3M
drive.google.com/open?id=0B-Jq7wg-_YOQRjJqUWxfY3k0NU0
drive.google.com/open?id=0B-Jq7wg-_YOQLTBZVkdteXlfX1k
drive.google.com/open?id=0B-Jq7wg-_YOQV29qTUtIbElXUDA
drive.google.com/open?id=0B-Jq7wg-_YOQMnpZeGxlWDdrejQ
drive.google.com/open?id=0B-Jq7wg-_YOQZFBBZUlRN1hZVEU
drive.google.com/open?id=0B-Jq7wg-_YOQNlpCeDhyWmNNYUk
drive.google.com/open?id=0B-Jq7wg-_YOQNVVuaG5NM2FZVFU
drive.google.com/open?id=0B-Jq7wg-_YOQdWxPR1NHQ2c5ZEE

larkboy
Long Standing Member

Posts: 347

Hospital silencer project. Jul 23, 2017 18:10:56 GMT

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Post by larkboy on Jul 23, 2017 18:10:56 GMT

Have now added sound insulation panels to the underside of the access boards on the rear deck and a compressible rubber seal to the edge of the drainage channels the boards sit on and the noise reduction in total must be around 80%!! Can't wait to go out this weekend coming to experience the full effect (off to dry dock for blacking). 😀