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| PEX for compressed air? |
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| bigmini:
--- Quote from: lordedmond on March 22, 2011, 08:57:19 AM ---do it proper copper or galvanised iron pipe with condensation traps in the drops Just for fun look up the pressure drop on that run bet you will need 1 inch pipe if you draw any amount of air Like the RO l over A losses in electrical circuits Stuart --- End quote --- By my rough back of an envelope calculation :smart:, for a 25mm ID pipe over that distance you'd get 25 l/s free air discharge with a pressure drop of 0.1 bar - assuming no bends or fittings. You'd have to convert that into old fashioned units yourself :) In SI units the equation (from Atlas Copco) is: PressureDrop=450*length*FreeAirDischarge^1.85/(workingPressure*diameter^5) pressure in bar, length in metres, FAD in l/s, working pressure in bar (in your case about 8), and diameter in mm. (use the actual diameter, not the nominal diameter) Doesn't take into account roughness of the inside of the pipe or any bends, filters, etc. You'd add all that on. You can see that a small increase in diameter reduces the pressure drop a lot |
| PTsideshow:
--- Quote from: bigmini ---PE and PVC aren't the same. --- End quote --- Don't know anything about PE The PEX that he asked about is not UV stable And the warning from the manufactures state this. As it is used in the walls or as a in the concrete floor for heating before it is poured. Never mentioned anything about PE so I don't understand why you are quoting my posts in your answers, and mixing the types. |
| marfaguy:
K grade copper at (currently, approx.) $5.00 a foot is a definite budget buster. Galvanized Iron/steel pipe is probably also a budget killer, not to mention would require underground jointing which I REALLY want to avoid (do manufacturers even make +- 150' lengths of Galvanized?). So nylon, probably nylon-12 in a .5" ID is the current choice for me. :headbang: I can't see needing that much CFM in the car port. If for some odd reason I suddenly have a need to run impact tools in the car port I'll either move the project to the shop or rent a compressor. If after I pass on some future owner finds the run inadequate then he can install his own dang pipe. :) Anything else I've forgot, or am not considering? :scratch: |
| bigmini:
--- Quote from: PTsideshow on March 22, 2011, 09:44:06 PM --- --- Quote from: bigmini ---PE and PVC aren't the same. --- End quote --- Don't know anything about PE The PEX that he asked about is not UV stable And the warning from the manufactures state this. As it is used in the walls or as a in the concrete floor for heating before it is poured. Never mentioned anything about PE so I don't understand why you are quoting my posts in your answers, and mixing the types. --- End quote --- I'm pretty sure PEX is another name for HDPE, also called PE100 here in Australia It's short for cross linked polyethylene. PE80 also has similar properties but is lower density. |
| PTsideshow:
If you have a woodcraft store in your area, the local store here sells the same kits and parts for the garage air kits with the nylon tube that Harbor freight sold. The extra fitting fittings cost more than I pay at US plastics. Compressed-Air-Piping-System Super Speedfit® Polypropylene Union and Swivel Elbows1/2" size is the size for the tubing. |
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