For each of the following problem, check the applicability of the thin-wall theory. Unless otherwise noted, the stated diameter represents an inside diameter.
Calculate the wall thickness required for a 36-in.-diameter steel penstock with an allowable tensile stress of 11,000 psi. The penstock, which is a pipe for conveying water to a hydroelectric turbine, operates under a head of 400 ft. Assume welded joints of 70 percent efficiency.
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