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The wall thickness of a 3.5-ft-diameter spherical tank is 7/15 in. Calculate the allowable internal pressure if the stress is limited to 6500 psi. 288.89ksi 288.89 psi 288.89 kips 288.89N Calculate the minimum wall thickness for a cylindrical vessel that is to carry a gas at a pressure of 1540 psi. The diameter of the vessel is 2.5ft, and the stress is limited to 15 ksi. 0.88 in 1.54 in 1.4 in 0.77 in