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Old 01-10-2019, 01:44 AM
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LKeithR LKeithR is offline
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Default How Good Is Pex Tubing?

There has been discussion here and on other sites about whether pex is suitable for airlines. Based on the burst pressures these guys achieve in this video I see no reason not to use it.

I'm in the process of putting together a small shop at home and I planned to use pex anyway but these tests certainly reinforce my decision...

https://www.youtube.com/watch?v=xYwB...ature=youtu.be
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Old 01-10-2019, 06:51 AM
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It would be interesting if they repeat the test with pipes at 0 degrees and at 100 degrees. See how much temperatures change things. I have been thinking about using pex to make airlines in my shop too.


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Old 01-10-2019, 07:51 AM
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Why install something not rated to do the job? Makes no sense to me. Get the correct stuff or don’t do it.

https://m.northerntool.com/shop/tool...xoCTKEQAvD_BwE

Same brand has hard alum lines for straight runs also. We have the flexible line kit in the shop and no problems running the 3/4 guns
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Old 01-10-2019, 09:44 AM
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I bought a Rapid Air kit for home/garage and installed. I modified all of the blocks to accept two couplers and a pressure gauge. I also made additional blocks rather than buy more from R-A. So far all of the Rapid-Air fittings and PEX have not leaked. Seems like all of the NPT pipe threaded fittings leak like a sieve. And I used a good pipe sealant with PTFE, too! I even tried straight Teflon tape, still had leaks. What can I say. Ken
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Old 01-10-2019, 12:19 PM
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Far as I know pex can be used for compressed air.
If you use pex buy it in stick form not coils, one hell of a lot easier to work with than coiled is.
Dan.
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Old 01-10-2019, 01:05 PM
4gsr 4gsr is offline
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Coil in the 1/2" OD wasn't too hard to work with. Any larger, yes!
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Old 01-10-2019, 01:07 PM
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Can't see anything wrong with black iron pipe myself. Two sticks will do a whole seacan
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Old 01-10-2019, 02:41 PM
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"pex" is now a generic word as Pex tubing comes from different manufacturers in different grades with different ratings.
I believe that any 1/2 inch "pex" will easily withstand pressures to 175 psi however the hidden issue is exposure to uv radiation causing breakdown.
I have a couple of rolls of the translucent white version which I believe is the worst affected variety.
I also have rolls of colored pex that seems to be red top color and black for most to the tubing and blue top coat black for most. obviously the intent is red= hot and blue = cold water.
these variants should be much more uv resistant.

That said T would run a pex loop around the top of the sea can and use either copper pipe or sections of quality air hose for drops.
That way if there is an event in the future it will not happen in your face.
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Old 01-10-2019, 04:21 PM
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I don’t see any reason not to run pet as long as you can keep sparks away from it.
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Old 01-10-2019, 09:41 PM
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I'm a big fan of Pex and wont put anything else in a house.

I've never used it for airline before.But I've been running a UV test on some at work. We put a temporary Op shelter and ran 3/4 Pex out to it for water supply. Because it was a temp unit we left the pex surface mounted over the top of it. 10 yrs later and still no leaks.

The Pex was a blue colored Rehau product. Direct exposure to south Texas sun and heat. and what little cold we get.
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