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  #21  
Old 10-31-2016, 11:58 AM
kamikaze kamikaze is offline
 
Join Date: Jun 2014
Location: Ottawa, ON, Canada
Posts: 353
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RapidAir makes nice all-in-one systems for compressed air systems, including certain types of tubing appropriate for burrial ...

The condensation factor someone mentioned seems to make sense ... compressed air warms up, hit cold tubes, condensation occurs ... Unless maybe you have a really good filter/dehydrator at the source in the shed, but even then ...

In my basement the compressor is next to the adjoining wall to the garage, one floor down ... one hole in the wall (top basement, bottom garage) and voila I'm in. With the RapidAir kit, this was all done quickly and easily ...
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  #22  
Old 10-31-2016, 01:52 PM
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1001001 1001001 is offline
 
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Location: Just Minutes from KBVI!
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Quote:
Originally Posted by flyinga View Post
Scoot,

I've run schedule 40 pvc for shop air since 1984; no problems.
With all due respect, absence of evidence is not evidence of absence. The fact remains that if the PVC pipe does burst, it will do so in a particularly damaging and dangerous way. I have seen personally the results of a 3" sch40 PVC air header operating at only 15-20 psig that failed spectacularly. We were fortunate that no one was in the area when it went.

Many people have said that PVC has worked fine for them in the past, and they are not wrong in their observations. They are wrong in writing off the risk because "it hasn't happened (to them) yet."
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  #23  
Old 10-31-2016, 06:34 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Not a recommendation to use PVC, but 3" sch 40 is dancing a lot closer to the edge than 1/2" or 3/4".
https://flexpvc.com/Reference/PVCPipeSize.shtml

Charlie
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  #24  
Old 10-31-2016, 06:50 PM
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1001001 1001001 is offline
 
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Quote:
Originally Posted by rv7charlie View Post
Not a recommendation to use PVC, but 3" sch 40 is dancing a lot closer to the edge than 1/2" or 3/4".
https://flexpvc.com/Reference/PVCPipeSize.shtml

Charlie
You're right about the stresses in the larger diameter pipe with the same schedule wall thickness. However, the pipe that burst on us was only operating in the 15-20 psi range so the hoop stress was way less than it could have been.

Again, my concern is not that PVC is more or less likely to fail in this application--I can't say one way or the other--it is that the *manner* in which it fails is catastrophic and potentially quite dangerous.
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