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Tool Talk Discussion Forum

Re: Compressed air supply line

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Stephen Newell

10-03-2012 04:25:23

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I'm a professional cabinetmaker and furniture refinisher. I've been around PVC for compressed air on a daily basis for 40 years and I've never seen any of it fail on its own. If you adapt to black or galvanized pipe where the couplers attach, it can be securely be fastened to the building and you won't have a problem. I have worked for others that have secured the coupling ends to a post with duct tape and have someone pull too hard on a air hose and break it. It makes a lot of noise but it isn't violent. 3/4" schedule 40 PVC is rated for 289 psi. As long as keep the pressure at a reasonable limit and the pipe is not hit and broken it will handle the air from a compressor. I keep mine running up by the ceiling where its been since 1986.

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Ken Macfarlane

10-03-2012 06:14:38

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 Re: Compressed air supply line in reply to Stephen Newell, 10-03-2012 04:25:23  
Don't listen to this poster, PVC at cold temps is very brittle, the pieces are very hard to extract if they blow up because x-ray translucent. Its only rated fro 289 psi on water not compressed gases!

Yes a break across the threads isn't too exciting, but a longitudinal rupture is bad.

Also, PVC can break down over time when exposed to some other plastics, I can't recall if it gets brittle or goes soft but it will fail at lower pressures.

No reason to use it for air service.

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Stephen Newell

10-03-2012 20:44:31

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 Re: Compressed air supply line in reply to Ken Macfarlane, 10-03-2012 06:14:38  
I guess you believe in man made global warming too.

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Ken Macfarlane

10-05-2012 06:46:56

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 Re: Compressed air supply line in reply to Stephen Newell, 10-03-2012 20:44:31  
Global warming ain't got nothing to do with it. I'm guessing just because you've never had one blow you don't believe it will happen.

Ever left a rope out in the sun and had it get brittle? Or even just had some plastic container sitting on the shelf inside in the shade a few years that you go to pick up and it falls apart? Happens to PVC too.

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