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Thread: PVC pipe-not for compressed gas service Reply to Thread
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  Topic Review (Newest First)
12-26-2007 12:25 AM
32 Altered There is a reason that compressed air cylinders are tested with water. If they fail, they leak. If they failed with air, they would explode. Pressure isn't pressure. gaseous pressure is dangerous, liquid pressure not-so, when you are talking about vessel failure.

John.
12-25-2007 03:40 AM
fordsbyjay
Quote:
Originally Posted by Doug Rahn
PVC should only be used for its intended and designed purpose, water supply and drainage.
Now there is a die hard 460ford fan. Fifteen minutes before christmas and he is checking out the forum.

:lol:
12-24-2007 09:45 PM
Doug Rahn PVC should only be used for its intended and designed purpose, water supply and drainage.
12-24-2007 06:51 PM
D.I.L.L.I.G.A.S.
Quote:
Originally Posted by 96Mustang460cid
I also 'think' that PVC weakens when exposed to the atmosphere.
Being a plastic, I would guess that sunlight doesn't do PVC any good either.
12-24-2007 01:02 PM
monsterbaby
Quote:
Originally Posted by AZFairlane
Just be prepared for the cost, it's probably much cheaper to do your system in either copper (type K) or schedule 40 iron pipe (black or galvanized).
Have you priced copper lately? dang that stuff has gone up, mine is done with iron pipe and found it's much easier and cheaper only problem with using iron pipe is it does tend to rust and cause problems so best is to have a filter and air dryer at the end not the beginning of the run.
That and i never have been worth a hoot at sweating copper pipe and getting it to work right, don't know why as it isn't that tough just always have problems myself (and thats me only

I have seen and even worked in shops using pvc pipe, I have also seen the stuff explode, one shop had it for year and years until someone was working with a coil spring that came loose from the suspension and hit the main line pipe, which in turn exploded sending shrapnel all over the shop so not only ducking a coil spring but then watching out for flying debris form the air line too just wasn't fun. They put in all iron pipe on that shop starting the next day.
12-24-2007 12:47 PM
96Mustang460cid
Quote:
Originally Posted by InfoFord
http://www.engineeringtoolbox.com/pvc-cpvc-pipes-pressures-d_796.html

my shops working pressure is 150 PSI

curious how does 3/4" sch 40 get rated for for double that and not be able to hold up to it?
The best analogy I can think of it airplane parts: wings, landing gear, ect. These parts are designed to handle the loads of the plane. Nevertheless, they are regularly checked for fractures (cracks) because of the cyclic nature of aluminum and other materials used to make these parts. A google search on, "Crack Propagation" and "Fatigue Analysis" should net you more reading material than any 'normal' person would want .

I also 'think' that PVC weakens when exposed to the atmosphere. Finally, I 'think' people are not as concerned about the actual strength of the PVC. Instead, it's the mode of failure compared to other, safer materials.

Have a good day!
Mchael
12-24-2007 10:19 AM
SQ34 Constant harmonicks seam to cause the most failures
12-24-2007 05:46 AM
FE_rex some of the oils cn cause imbrittlement. Also that rating is for a steady pressure in fully supported pipe. It does not take into account fittings, torques, temperature changes etc.
12-24-2007 01:20 AM
InfoFord http://www.engineeringtoolbox.com/pv...res-d_796.html

my shops working pressure is 150 PSI

curious how does 3/4" sch 40 get rated for for double that and not be able to hold up to it?
12-23-2007 10:21 PM
schmitty The main shop on our farm was plumbed with PVC. The "when" happened a couple of years ago. It was fortunate that no one was inside at the time as it blew the hell out of sh)( in there. Father in law wondered how that happened and started to replace the line with more PVC. I just happened to see an article in a magazine about this pipe and compressed gas. I told him to get something else, he got mad at me and I explained that if he wanted a time bomb for a shop I'd get another job. I did not want to leave work in an ambulance. Long story short it can happen to you because it has happened to me. Use something that is rated for the job. Remember hospital bills aren't cheap.
12-23-2007 09:36 PM
69tdega
Truck air line

I have used truck air line.Comes in all sizes and for a long run is very simple as it comes by the foot.If a semi running down the road when its 0 or 100 degrees is safe using it for the brakes, I think I can trust it not to fail.I believe its called Synflex.Must use brass compression fittings for connecting.
12-21-2007 05:39 PM
fordsbyjay I think it is a great post and well warranted.
12-21-2007 05:16 PM
AZFairlane You know, you guys are right. Nobody said "it won't happen to me". Sorry. It's just that I have seen the aftermath of one of these PVC bombs, and it's not pretty. You guys have been lucky, and I hope you continue to be.
I never meant to create any bad feelings or get an argument started. It's just that there are so many "dangerous" things in our garages and workshops, that we have to work with and can't do anything about making them safer. I was trying to make you aware of one that can be deadly, that you can fix. It's not that expensive either. I piped my system with 3/4 galvanized pipe for about $200, and I have air everwhere I need it. I ran about 120 feet of pipe to get the air around the house.
12-21-2007 04:24 PM
D.I.L.L.I.G.A.S.
Quote:
Originally Posted by AZFairlane
I knew there would be people that said "it can't happen to ME".
Whatcha gonna name the seeing eye dog?
I smell some word-twisting going on :? . I know I didn't say the phrase "it can't happen to ME". In fact as I stated, I probably have just been lucky so far.

The dogs name?........Ummmm, probably "cyclops" or "pink eye." :lol:
12-21-2007 03:57 PM
psquare75 I'll name him AZFairlane.
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