A large spherical tank contains gas at a pressure of 430 psi. The tank is 41 ft in diameter and is constructed of high-strength steel having a yield stress in tension of 82 ksi. Determine the required thickness of the wall of the tank if a factor of safety of 3.0 with respect to yielding is required.

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?