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OT Air Compressor

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Ole Country Boy

01-26-2006 10:38:20




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OT but barn/shop related. Got the shop all set up with the new cabinet bases and work bench tops. Got a roll around work table with wood top.Got my new work bench lights hung, electric drops where I need them.

My next thing is getting air drops to a couple of locations. My compressor is semi portable, it is on wheels and I can move it out side to where ever I need it, but most of the time it is in the shop. I decided I need to run over head air pipe to the opposite end so I don't have air hose across the floor. Of course the old way of running air line was black pipe and Teflon tape everywhere. How bout running that air line in heavy wall PVC pipe? Really I only need to make one drop on the east end and another on the west wall, apx 45 feet away.

What I am thinking is this, pipe it in PVC with female connectors at both ends of shop and a short piece of hose from the compressor tank to the PVC. Thinking I may need a storage tank of some sort and have an old pressure tank from a water well pump. It is good and holds pressure fine. My thinking is, I can charge that tank mounted up in the rafters, then have a bunch more air available than just the smallish tank on the compressor.

I doubt seriously I would ever spray paint with it, mostly for blowing off parts, cleaning, run the few air nailer/staplers I got. Probably set the pressure regulator where it is now, apx 45PSI.


See any problems doing it this way? I hate like heck to rig it all up and then find out the hidden problems.

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BillM(OH)

01-26-2006 21:30:06




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Pipe's not a big problem with your idea, but the old water tank sure is -- unless you hydrostatic test it at considerably higher pressure than it'll ever see with air pressure, you are asking for a disaster -- 120psi air pressure is a bomb compared with water pressure, if she ever lets loose it'll kill ya -- don't use it,



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jwmewborn

01-26-2006 20:27:46




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
I have had heavy wall pvc pipe in the top of my shop for at least 10 years. I was careful about cleaning, fitting, and gluing up, not because I was afraid of it blowing up, but I barely had time to the job once little lone twice. I used some 6" pipe to give me additional volume, works great. Put 1 drop from the bottom of your pipe for a moisture drain. Put your service drops on the top of the main, then "L" over and down, this will keep moisture from your service drops.

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Bob Harvey

01-26-2006 15:45:03




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Soldered heavy wall copper tubing is your best / safest bet. Check out your local tire store.



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Tim...Ok

01-26-2006 12:20:34




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
The machine shop I used to work at had all of their overhead lines done with PVC,never had a failure in the couple years I worked there..If you can get the good heavy duty elbows and such,I wouldn't hesitate to use it..

My free $.02 worth :)

Tim



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TheOldHokie

01-26-2006 11:47:25




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Well after following some of the links the word is clear - do not use PVC for compressed gases despite it's more than adequate burst ratings. The fact that OSHA won't approve it is not a show stopper in my book (there's a lot of stuff they won't approve that's fine in toy shops) but the failure mode is severe if somewhat unlikely. And the possibility of oil weakening the pipe seems real enough. Personally I installed galvanized iron pipe in my shop and invested in one of those elCheapo HF pipe threading sets. Just more time and effort.

TOH

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Dan

01-26-2006 12:32:19




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 Re: OT Air Compressor in reply to TheOldHokie, 01-26-2006 11:47:25  
Not that I dissagree with your post, but the statement you made : "The fact that OSHA won't approve it is not a show stopper in my book..." struck a humorous vision in my mind. If OSHA saw just HALF of the stuff I used, and the proceedures did in my garage, during my NAA Project Rustbucket refirbishment, I would be fined for life :-)

Dan



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DMAN

01-26-2006 16:39:37




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 Re: OT Air Compressor in reply to Dan, 01-26-2006 12:32:19  
Dan, Your post about OSHA got me to thinking.
If OSHA seen me driving my 9N this is what I would have to do.
First wear a hard hat so as not to get hit in the head by any low branchs. Even thuo I have no trees on my property.
Wear goggles with face shield.
Leather gloves.
Steel toed shoes.
Resperator if any dust is present.
Seat belt. This is just a few things that they would make me do. SO PLEASE DONT TELL THEM WHERE I LIVE.

If you think OSHA is bad, try dealing with CAL OSHA.

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crazy8

01-26-2006 11:46:14




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Dont use pvc!



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Dan

01-26-2006 11:25:39




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
I am no expert on this by any means, but I just visited a local antique Ford tractor enthusiast last weekend, and he had his shop tubed out with drops for his air compressor and he used heavy duty PVC piping. I commented on it, and he said it worked just fine and was rated well over what his compressor put out.

Just my .02,
Dan



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tim in pa

01-26-2006 11:18:39




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
copper is the way to go for sure, with flexible "whips" on the ends. make sure all components are at least 2 x the max air pressure you'll use, especcially your extra tank. a frien buried a 55 gal drum in ground - worked great.



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TheOldHokie

01-26-2006 11:13:11




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Below is a link to a table of pressure ratings for various sizes and types of PVC pipe. Please note that the REQUIRED MINIMUM BURST PRESSURE is nearly 5X the rated operating pressure. I think you'll be quite safe using schedule 40 pipe but you may be (unpleasantly)surprised at the cost. Make sure all your solvent joints are good and solid.

PVC Pipe Table HTH

TOH

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MikeT

01-26-2006 11:03:54




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Mope, don't use PVC. I would use 1/2" refrigerant copper tubing. It has a rated bursting strength of over 300 psi. Or, Home Depot has thick wall 1/2" copper tubing (in 10' sticks) that has about the same rated bursting strength. They also have thin wall which I would not use.

The trouble with black pipe is eventual rusting. If you use black pipe, then use a filter/moisture separator at the compressor end and another filter at the other end of the pipe.

Sweating copper fitting is so much easier than cutting and threading black pipe.

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Bob

01-26-2006 11:03:34




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
Go to the "tool talk" board>Link

and>Link enter "plastic air line" or "PVC air line" in the search box, if you want an "earfull" of condemnations of doing this.

Apparently, nowadays there is special plastic line approved for this, but I'll bet it's $$$.

Copper is still a good choice for air lines, but, nowadays it's PRICEY, too, but better than iron, if you're going to run air tools, or do any spray painting, there will be no rust particles to filter out, with the copper line.

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Rick H. Ga.

01-26-2006 11:02:30




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
My Dad used 1/2 inch CPVC in his shop for general use air pressure lines and has never had a problem. He has never used more than a 100 to 125 psi.

The difference between CPVC and PVC is that the PVC can withstand pressure with no heat but the CPVC can withstand a certain amount of heat and pressure (a little stronger molecular structure).

HTH. Rick



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DMAN

01-26-2006 10:44:45




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
I will be setting up my shop in the near future, and I was thinking about using PVC also. I have seen it done in different shops before. I forgot what the rating is for thick wall PVC, but if I remember correctly it was around 180 lbs. I may be wrong on the rating, so double check it.



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rbell

01-26-2006 10:41:32




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 10:38:20  
You just opened a big can of worms
For saftey sake I would NOT use PVC
Will it explode? maybe maybe not but if it does you are looking at plastic shrapnel, not a split seam as you get with black pipe or copper.
MHOO



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Ole Country Boy

01-26-2006 12:29:31




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 Re: OT Air Compressor in reply to rbell, 01-26-2006 10:41:32  
WOW,,, I DID open a can of worms!! Just happen to talk to my mechanic since I posted about different topic. Ask him what he used. Black pipe and he hates it, never used PVC.

to the guys who advised copper,, nope, would have to purchase all the tools involved with cutting and flareing it and ,, naw...

Ok, so here's what I am giong to do. Get the heavy wall PVC and run it. At the drops for the two different outlets, going to drop into a T, then continue below the T with a drain, to allow me a place to drain out any water.

Will let you know how it works IF it ever pops loose or explodes. Like I said, not running high pressure here..

Once again , thanks to you all for your ideas and advise. I really do appreciate it.

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Hobo,NC

01-26-2006 14:50:36




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 Re: OT Air Compressor in reply to Ole Country Boy, 01-26-2006 12:29:31  
Make sure you use a cleaner on the joints, you kin git clear cleaner



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