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North Central Texas | We have pens 30, 40 , 50 years old out of oilfield materials. The 3 1/2 or 4 is great especially for fencing on corners. Use them as you verticals and 2 3/8 for you horizontals and drops. As far as pens don't ever go less than 2 7/8. 2 3/8 just won't hold up unless it is true drillstem. Lots of pipe out there but a big difference between drillstem and pipe. Most the stuff that rusts out is a transfer pipe and what we would call dirty pipe. Chances are it will have a seam in it that will split. It is lower quality. A big difference is sourcing your pipe from known areas. If lots of salt is in that region then the pipe won't be as good. As far as welding, it really depends but it sure teaches you a lot about welding especially on sucker rod.
Cap them to keep them from rusting on the inside.
Paint them once with Sherwin Williams industrial paint and forget about them.
Edited by ntexcotton 10/27/2015 17:03
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Steel Pipe for post
