Reply by William Shelley

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Posted on Pex for compressed air lines? Yes please!

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William Shelley

609 posts in 1711 days

#1 posted 02-09-2018 11:16 PM

For a compressed air line I would not worry about whether it has an oxygen barrier or not. Drip legs are not a bag idea, a filter and drier on the output of the compressor to is a good idea. Even if pex does get a leak or knocked into it does not shatter like PVC does. There are a few PEX pipes that are stated to be okay to use with compressed air but most don t explicitly state it. Also double check the pressure rating and what you compressor can put out.

- Bill1974

This PEX states 180PSI @ 73F. My compressor maxes out at 125PSI tank pressure and I have it regulated down to about 105PSI.

I don t mean this as anti-pex but I always wonder why people in small or hobby shops don t use air hose? It s nearly as cheap as pex and rated for compressed air. Someone once said because it droops but that s an easy problem to solve.

Could you paint the the pex? That would block UV.

- Rick_M

That was my original plan, to use some garbage braided air hose I bought at home depot that is so stiff when it’s cold that you could use it as a fencepost. But home depot doesn’t carry hardly any barbed fittings for 3/8, and the supply houses near me are usually closed on the weekends, and expensive to boot.

And regarding UV… honestly I might just swap out my T8 fluorescent bulbs with LED retrofits. The LEDs will put out no UV light whatsoever, plus use less electricity. However, this shop really only needs to last me a few years until I can afford to buy or build a larger space.

-- Woodworking from an engineer's perspective

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