There is more to stretched steel's integrity than the size of the bulge. Actual wall thicknesses would need ultra Sonic's to determine accurately , then there is the stress factors that were the cause of the bulge, and how they affected the steel, other than the obvious bulge. At what point will it burst? Is it stress cracked? and how do you see that if the crack is on the inside only ?
If there was a sour gas line with a bulge running near your house would you fee ok with that? Didn't think so.
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