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 02-17-2005, 09:06 Post: 106277
beagle

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 Buried air line

Good point about the back pressure, but I think an in-line check valve would solve that problem. The pressure (head) drop in the line is propotional to the flow vlume or velocity. For low flows, around 4cfm, the pressure drop over 100' isn't too much of a problem, especially with 3/4" lines. If you need over 10cfm, for running high consuption tools like impacts or sandblasting equipment, the losses could be high. Elbows, valves, strainers, etc. are high contributors to losses in a flow system, and should be kept to a minimum.

I think the condensation problem could be the biggest challenge, especially underground where the air will cool in the line. You will need a way to continuously remove the condensation.






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 02-17-2005, 09:49 Post: 106282
shortmagnum

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 Buried air line

I think all of these responses have been beneficial. It seems that the ability of this system to work depends on what your needs for pressure are at the remote site. If you just need it to pump up a tire, most likely no problem. If you want to run air tools, it might just be an expensive mistake.

I have also thought of the same project but I only have about 8' to run underground. Condensation was also my biggest concern. You'll need to be able to blow the line out regularly so you'll need a high flow valve at the low pressure end.
Dave






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 02-19-2005, 11:14 Post: 106448
earthwrks

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 Buried air line

I'm not a plumber but I did have to fix some 2" sprinkler lines that I hit. Maybe this is common knowledge...but there is a different PVC (or CPVC??) cement used for underground. Above-ground cement used below ground is easily attacked by moisture. The supplier said "universal cement" isn't intended for underground. I got some "universal cement" on my clothing and hands and sure enough after a little coaxing it turned milky-white and flaked off indicating it did disolve in or absorb water. Super Glue falls into this category--in fact the main ingredient for the curing accelerator is water.






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 02-19-2005, 12:09 Post: 106450
denwood



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 Buried air line

If water attacks the glue on pvc water lines, a lot of us are in trouble. I was under the impression that the glue used (Normal glue) softened the pipe some and let it almost weld a little and after cure time it is ok to use. Are you sure that underground glue isn't just something that cures better underground? I have never used pvc underground so maybe I just haven't heard of this potential problem.






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 02-19-2005, 13:20 Post: 106452
earthwrks

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 Buried air line

I'm 100% positive it is special glue (not really a cement which is a solvent a.k.a. "welding"Wink yeah right for underground. Constant moisture on the outside of the pipe attacks the glue, and that it's under pressure (sprinkler system) doesn't help. Is your underground piping under pressure? If not then I wouldn't worry. I was working next to a plumbing supply house and they knew what I was working on so they gave me the heads-up. As I recall, the glue was green-colored probably for inspection purposes (the primer was clear), not clear like aboveground (purple color is also for inspection but it's for the primer). I use the term "glue" because the fittings weren't "welded" together becoming one material. I found that the pipe fittings were not made of the same, identical material (pipe has small airbubbles in it from the foaming process when it's extruded the fitting are molded and have no detectable air bubbles). I found this out when I mis-fitted some pipe to the existing fittings; I used a propane torch to CAREFULLY burn or melt the old pipe and the fitting was ok!--it didn't melt as fast. So the joint was "glued" together rather than "welded".






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