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Hi Bob, CU type k, makes a fine air piping system. Looks good, strong and will handle 1000psi plus depending on installation method. I like using Harris 15% silver(Ag) solder, about $22/lb, as it's viberation resistant and strong. Piping system costs are about $100 higher for the typical home shop using heavier CU pipe and Ag solder joints. Clean the pipe ends with 80grit emery paper and the pipe fittings with a fitting wire brush. NO acid/flux is required provided your joints are precleaned as described as above. Use Oxy/Acet torch with a "O" size brazing tip with using a slightly reducing flame. Heat the joint with a medium flame until the solder will flow, then move the flame towards the rear of the joint thus sucking in the liquid solder thru out the joint. Add enough solder until a slight solder dimple forms at the bottom of the joint seam, then stop as the joint is full. Run the main line at a 1/8" drop per 12" of run and take the "T" vertical drops off from the TOP of the main line run with a 6" drain with ball valve at the end of each vertical drop. Take your air supply off 6" above the ball valve as this lets all the inside piping junk (water & Scale) drop to the drain. Use a flex connection to the main line from the compressor, hydraulic hose works well. A well designed piping system equals more usable CFM you will have by using the least amount of pipe fittings possible to get the job done. T_Bone
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Rod