Compressed Air Line Question

[ray66v]

Good, then I will just deal with statements you make that could lead others into a misunderstanding of pertinent physical issues and how they relate.

Enjoy.

 

[Scrambler82]

This stuff looks interesting... From Northern Tool !

http://www.northerntool.com/shop/to...ontent=20921&gclid=CInPy8TY5M4CFQmRfgodK-UP0g

 

[TemporaryKubotaOwnerMark]

Northern tool is not Harbor Freight.

 

[TemporaryKubotaOwnerMark]

The Plastics Pipe Institute recommends against the use of thermoplastic pipe to transport compressed air or other compressed gases or the testing of such piping with compressed air or other compressed gases in exposed above ground locations, e.g. in exposed plant piping. It is recommended that all thermoplastic piping used to transport compressed air or other compressed gases be buried underground or encased in shatter-resistant materials. In designing thermoplastic piping to transport compressed air or other compressed gases, the strength at the operating temperature, the pressure, the energetics, and specific failure mechanism need to be evaluated.

And here is the Government Link

Safety and Health Information Bulletins | The Use of Polyvinyl Chloride (PVC) Pipe in Above ground Installations

There ya go.

 

[PILOON]

Re diesel and PVC,
I used some re-enforced clear PVC as a fuel line to fuel my tractor as I liked the flexibility.
Within a month I could have used the PVC as a fishing pole it got so hard and stiff.
Looks like there is a reaction between PVC and fuel.

 

[Deere Dude]

It isn't difficult to turn a pipe threader, but I cant count the number of leaks I have encountered when testing threaded pipe installed by professional pipe fitters. You need high quality dies and good cutting oil to make good threads and then properly tightened, not too tight as to damage the threads but tight enough to not leak which takes a bit of experience to get it right.
You also need to use schedule 80 pipe because if using schedule 40, the threading cuts away over half the wall thickness which leaves a very weak joint.

They might be professional, but they must really suck at it.

If the threads are fair to midland a good Teflon paste will seal it up as will LocTite 242. Tape is iffy.

Sch. 80 pipe should never have to be use for light air. Sch. 40 is much cheaper and works fine. The only sch. 40 that failed on us is when an air drop is hit with a fork lift or a scissors lift or some other man caused problem. that shears them off, but the same would happen with sch 80.

 

[SPYDERLK]

Here is a quote for what I posted about being underground and/or encased.

The Plastics Pipe Institute recommends against the use of thermoplastic pipe to transport compressed air or other compressed gases or the testing of such piping with compressed air or other compressed gases in exposed above ground locations, e.g. in exposed plant piping. It is recommended that all thermoplastic piping used to transport compressed air or other compressed gases be buried underground or encased in shatter-resistant materials. In designing thermoplastic piping to transport compressed air or other compressed gases, the strength at the operating temperature, the pressure, the energetics, and specific failure mechanism need to be evaluated.

And here is the Government Link

Safety and Health Information Bulletins | The Use of Polyvinyl Chloride (PVC) Pipe in Above ground Installations

I use black poly which does not present the shattering problem. --The thicker wall, rated ~ 200psi.-- But still only for feeds to the work area - not in the work area. I do have a 4' section above ground in a corner in the heat in the barn. Its only 160psi rated at 70F. Its been fine running at 150 PSI for 17 yrs.

 

[TractorGuy]

I did hear of a guy getting thrown off a ladder by driving a nail through a PVC air line. You can't protect from stupidity.

I ran 3/4 schedule 40 PVC in a shop and never had any trouble with it. It's rated for 480 PSI.

JM eagle 3/4 in. x 1 ft. PVC Schedule 4 Plain-End Pipe-57471 - The Home Depot

 

[ray66v]

Northern tool is not Harbor Freight.

I've been telling my mother that, for 20 years!

I finally gave up.

 

[Stimw]

Here is an option, DOT Air Brake Tubing- Velvac 1 2 Blue Nylon Air Hose Tubing Dot Approved 1 Foot Roll 4deg to 2degF | eBay
It's easy to attach standard fittings you just have to use brass inserts. When you compress the ferrel it clamps the hose to the insert.
There is over a million feet of it in use, just look when a semi goes past! this is what is used for tractor and trailer air lines. Hoses are used from frame to axles.