this has been discussed at great length here but bears doing again.
The way I remember it there is a PVC that is approved for air. The Stuff you are looking at in the big box lumberyard isn't it.
The 370 number you see on the pipe you looked at is the burst pressure, not the working pressure. Over time with fluctuations in pressure will weaken it and it will burst.
You are not talking much money so go with the black iron. I have heard that Galvinized can cause issues with air tool motors as it ages and the galvinizing starts to come off.
Also make sure you put in water traps at every major bend in the pipe.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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