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Old 03-09-2013, 07:48 AM   #16
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PEX for air compressor lines


Here is a paragraph that will explain the difference between air at pressure and liquids at pressure. PSI is PSI, but the reaction is different. The link to the whole article is at the bottom and comes from the OSHA website.

To Whom It May Concern:

From time to time, I receive inquiries as to the suitability of using PVC pipe land fittings in compressed gas piping systems. While the benefits of use may be enticing, it is a very dangerous and, in some states, illegal thing to do. For example, MIOSHA (Michigan's branch of OSHA) prohibits the use of PVC plastic in compressed gas systems unless properly encased in steel, cement, or some other approved material. Please check your local and state regulations.

The main problem with using PVC pipe and fittings for compressed gas is not that it spontaneously explodes but that PVC is a brittle material that can be broken or shattered with external force unless properly protected. Compressed gasses can be best described as being analogous to a coiled spring. When a PVC pipe or fitting fails when under stress from compressed gas it literally explodes like a bomb, sending shards of plastic flying several feet in all directions. Liquids, on the other hand, being compressed by only 1/10th of 1% contain very little stored energy. When pressurized systems with liquids fail, the energy is dissipated very quickly, thereby creating a much lower potential for hazard.

Colonial Engineering does not recommend the use of PVC plastic pipe fittings in compressed gas service.

If you have further questions regarding this matter please feel free to contact me directly.

Sincerely,

Jack Roach



ESLON THERMOPLASTICS, INC.
P.O. BOX 15894, CHARLOTTE, NC 28210
DATE: July 11, 1988
704-889-2431 800-438-7881

http://www.osha.gov/dts/hib/hib_data/hib19880520.html

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Old 07-08-2015, 08:07 AM   #17
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PEX for air compressor lines


I also couldn't find a definitive answer to using PEX for air line. So I went to Northern Tool and bought 100 ft 1/2 PVC air hose. Using worm gear clamps and brass fittings I constructed a great system. I can run 150 psi but I'm still using the regulator at the compressor to set tool pressure.

I also added "wet legs" below each hose connection to catch condensation that accumulates when the compressor is off. An air tank bleeder valve at the end of each wet leg allows me to easily drain the water. ☺
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Old 10-27-2015, 05:59 AM   #18
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PEX for air compressor lines


I've seen so many yellow coiled hoses fail that people use in both shops and manufacting plants that I refuse to waste money on one at home. Now these are under pressure from shop air also. No was was ever hurt by any failures even though they were using the hoses at the times they failed. I've had ends blow off, hose breaks even using them myself. I've never been hurt...scared by the rush of air, but never hurt.

You did install some shut off somewhere in your system correct? Go get another coiled hose to blow again at a later date, turn on shut off valve and get back to work.

That being said if pex will hold up to 160 @ 70F that is all I need to know. I plan using it as the main lines inside the walls of my shop/garage. I have a bunch of air barrier pex I bought at an auction. Already have the crimp tool so I just need fittings. If it lasted 5 years like it has for someone else, it will have paid for itself already.

I would see nothing wrong with it used that way, protected from damage inside a wall cavitiy. Being used as the distribution lines, NOT as a line that would be handled an any way.

Most shop airlines are exposed to damage, fork lifts, carts, boxes, etc etc. I can see why in industial/manufacting/shipping would have steel pipes. Home use inside a wall by a home owner? Steel is overkill and moisture inside would cause rust in pipes while moisture on the outside would cause insulation issues.

What they get $'s for Rapid Air is insane!
This is a DIY chat correct? Stainless steel air lines??? Really?
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Old 10-28-2015, 07:36 AM   #19
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PEX for air compressor lines


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