I just had a thought(that may be a bad thing)what do you all think about 3/4 black plastic water pipe for air? This would only be from the shop back to the house and under ground, right at 350ft. I am well aware of the problems with PVC and shattering,just need a cheep air line back to the house. Pipe is rated for 200 psi.
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I have thought of running an underground line from my shop to a machine shed a couple of hundred feet away, but figured there'd be LOTS of condensation in the line which would blow out with the air at the far end at inopportune times. I wonder HOW that would actually work?
willie in mn
Well-known Member
Another thought- from a cost standpoint I think it would be more practical to pick up one of those economy grade (cheap) pancake type compressors. Cost less than $100 & can handle most air tools for limited use. Figure the cost of the pipe, & depending on where you are located, to trench deep enough to keep condensation from freezing.
Willie
Willie
I buried 1/2 inch rubber air hose between my machine shed and garage in 2002 about a foot deep right in the dirt and so far haven't had any leaks. The line has a water seperator right where it comes into the garage. I get very little water in it The shed is not heated and the garage is. The rubber don't seem to rot when buried. I have 175 psi.
Awlknottedup
Member
I used 3/4" PEX for the shop airlines. There is a buried section from the shop to the machinery shed. It works great and 300' of 1/2" is less than $100.
Hal/ Eastern WA
Member
I have very rocky soil, so whenever I bury any type of line, water, electrical or whatever, I sleeve the line with PVC conduit. It comes in 10 foot sections and is easy to work with and not too expensive. I do not use any glue on the joints.
Damage from rocks is a real concern. Also damage from burrowing rodents, although my cats seem to do a pretty good job of keeping rodents away from the buildings.
I think if I was going to run an airline underground that far, I would sure look closely at PEX. PEX is not that expensive and seems to work very well for water pipe. I would want to research how well PEX stands up to oils, since most compressors put some oil in the air over time. You don"t want to have to redo the job in a few years. Good luck!
Damage from rocks is a real concern. Also damage from burrowing rodents, although my cats seem to do a pretty good job of keeping rodents away from the buildings.
I think if I was going to run an airline underground that far, I would sure look closely at PEX. PEX is not that expensive and seems to work very well for water pipe. I would want to research how well PEX stands up to oils, since most compressors put some oil in the air over time. You don"t want to have to redo the job in a few years. Good luck!
Anonymous-0
Well-known Member
$40 on sale at Harbor Frieght. Anouthger $40 buys a 750 watt inverter that will run that aircompressor off the car battery. He may need more psi/cfm thought.
fixerupper
Well-known Member
Last fall I buried 3/4" pex inside 2" gray conduit. Worked great. I glued the 10' pieces of conduit together on the ground beside the trench, put it in the trench and buried it. Then I pushed the pex through the conduit. The pex slid through the conduit like it was greased with butter. The pex I used is rated for 160 psi @ 50 degrees farenheit. I used double crimp rings on the splices. Inside the shop none of the pex is exposed to normal shop activity to avoid damage and possible rupture. Jim
Stephen Newell
Well-known Member
Well the black plastic pipe is a lesser grade than PVC. The problem using PVC for air is not the pipe but the way people install and use it. If you regulate the pressure down from the compressor to about 100 psi before you go to PVC it will help a lot. The biggest problem with PVC is nobody secures it very well. They run the pipe all the way to the end and put a coupling right on the PVC. Then when someone pulls on hose it busts the pipe. I use a black pipe joint which I weld a mounting plate to it to where I can firmly bolt it to the building to connect the PVC to which the coupling is mounted to. After working around PVC used for compressed air for more than 40 years I've never seen a pipe burst on it's own. There has been 0 pipe broken in my shop and the pipe is more than 25 years old now. I will soon be remodeling the shop and will replace the pipe with new PVC as I know the pipe tends to get more brittle when it gets old.
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