For each of the following problem, check the applicability of the thin-wall theory. Unless...

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 tensile stresses (circumferential and longitudinal) developed in the walls of a cylindrical pressure vessel. The inside diameter is 18 in. The wall thickness is . The vessel is subjected to an internal gage pressure of 300 psi and a simultaneous external axial tensile load of 50,000 lb.