I've known compressors with every type line between the compressor and tank described being used, and the best kind of line, the one I talked about before, is usually the one made for air service that has the stainless braided cover. In my opinion that is about the best type you can use. I say that because we tried all of them on Dad's 7 HP continuious run compressor and the line is the only type that ever lasted (ie it was still gong stong after 6 years when both of the other ways developed cracks etc within a year or two.
That said, the next best would be the heavy copper or steel tube as both have the ability to absorb both the vibration and expansion caused by the heat. In the case of Dad's compressor I think we just got unlucky as either copper or tube usually lasts a pretty decent amount of time when done right.
The least desirable way to do it is for it to be hard piped. The reason it doesn't work that great is that when installed it has to be EXACTLY RIGHT or the stresses caused by it being a bit short, long, etc all add up and are then magnified when it gets hot. Those stresses, in turn, will wind up causing it to leak at the joints. Worse case it can causse cracks in the compressor where it attaches, or in the pile itself. Either isn't a good thing...
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