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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 11-28-2009
marvjeanm380 marvjeanm380 is offline
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Default ? Pipe to use for running air lines?

I am going to run rigid lines from my compressor through the RV garage and woodworking shop. What kind of pipe could/should be used for this purpose. Is PVC adequate? My compressor is 60 gallons and 150 PSI. I will generally keep the regulator at 100 PSI unless I am airing up the tires on the bus.

Thanks in advance
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Old 11-28-2009
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My shop has been plumbed with PVC for 9 years now with no problems at all.
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Old 11-28-2009
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Marv- if possible, use larger PVC pipe like 1-1/2" or so- whatever matches the large plug in the side of your air tank. This gives added reserve capacity and reduces friction- providing more power at the end of the line. You will not be able to break lug nuts loose on the bird at 100 psi, unless you have a 1" rubber air hose and 1000 ft-pound impact wrench. I would also put water traps at the beginning and end of the line and run the piping up near the ceiling between stations. The longer that you can keep the air in the pipe, the cooler and less-wet it will be. Moisture in the air is your enemy. There are some nice plans on line. Most will recommend against PVC- but if you support the pipe runs and anchor the stress areas to a wall or floor, you should be fine. Even at 150 PSI at the tank, I have trouble getting 120 psi at the end of 75' of 1/2" hose. In the end, it was easier for me to use a nitrogen tank for filling tires, plus, I can carry it with me. About $150 for the tank and gauge- then $15 a year to fill up the tank once.
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Old 11-28-2009
Hisham Amaral Hisham Amaral is offline
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Quote:
Originally Posted by marvjeanm380 View Post
I am going to run rigid lines from my compressor through the RV garage and woodworking shop. What kind of pipe could/should be used for this purpose. Is PVC adequate? My compressor is 60 gallons and 150 PSI. I will generally keep the regulator at 100 PSI unless I am airing up the tires on the bus.

Thanks in advance
Marv

Be sure to us schedule 80 PVC pipe I think that a 1" dia will do the job.The 1" air impact wrench will require a air 3/4" fitting to be able to produce 1200-1500 ft-lb of torque (air tool that you can buy at Harbor Freight). Good luck with the project.
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Old 11-29-2009
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copper

http://www.shopfloortalk.com/forums/...ad.php?t=20056
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  #6  
Old 11-29-2009
Joatha Joatha is offline
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Please do not use PVC.

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

http://www.plasticpipe.org/pdf/recom...ressed_gas.pdf

http://www.charlottepipe.com/Default...0&type=PVCCPVC

http://www.swtwater.com/catalog/pict...Sales_0408.pdf

And I could list a LOT more manufacturers.

The manufacturers of PVC will tell you NOT to use it with compressed gas (as noted on a couple of the links above to actual manufacturers of PVC). Yes, there are folks that have used it before. But, they are sitting on a ticking time bomb if you ask me. There are plenty of stories about PVC that has exploded and I know some folks that had that happen. Fortunately, they weren't in the garage when it happened. But, it did do some damage. The issue is that when it goes, it can shatter (as opposed to metal which will just split). And it will create lots of shrapnel. If you happen to be in the area when it happens, then you will likely be injured.
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Old 11-29-2009
Joatha Joatha is offline
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Quote:
Originally Posted by rwoody View Post
And make it L or K. I'd also use 3/4" copper or you'll lose a lot of pressure over any length run.
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  #8  
Old 11-29-2009
marvjeanm380 marvjeanm380 is offline
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Default ?Pipe to use for running air lines?

Thanks to everyone for your input.

I will use 3/4 inch copper.
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  #9  
Old 11-29-2009
Jim Harvie Jim Harvie is offline
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I used 3/4 copper in mine.
Air tanks like the ones found on your bus can make great water seperators too. Mount one on the wall with a lanyard or pet cock on the bottom, and use the other plugs for quick connects and to run the line in series to the rest of the shop etc.
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  #10  
Old 11-29-2009
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warbucks13477 warbucks13477 is offline
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marv designing a compressed air system is a lot more complicated then just specifying 3/4" copper pipe. And positively do not use any kind of PVC pipe. It has been restricted by OSHA and all agencies that manufacture it since 1978.
http://www.nmsu.edu/~safety/news/new..._air_lines.htm

When designing the system you need to use the smoothest forms of copper pipe and fittings you can find. Use as few a number of angle fittings as possible. Its the velocity of the air thru the pipe and the turbulence that really kills the pressure and volume at the end of the fitting where you want to use the air. And when soldering the connections clean the tubing with a good wire brush you can buy where you buy the tubing and use as little solder as possible. A bump of solder inside the pipe causes air turbulence and negates all of the other good things you do.Good luck.

Now in Valdosta, Georgia on our way to Lake worth Florida, coach running beautifully.
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