I need to tell our fabrication dept. the correct diameter to role several 20' lengths of 1 1/2" sch. 40 pipe so they will fit as a hand rail for the tank stairway I designed. Tank dia.=46.15',tank height=46', stair stringer angle = 35 deg., stair height (vert.) 34'. I can't find a formula to figure this one out.
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