11-Pressure Vessels.pdf - Pressure Vessels Civ E 270...

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Pressure Vessels Civ E 270 Khattak, N 1 Thin Walled Pressure Vessels Cylindrical and spherical vessels are used in the industry as coolers, boilers and tanks. “Thin wall” refers to a vessel having an inner radius to wall thickness ratio of 10 or more, i.e. r/t ≥ 10. These vessels are usually filled with some kind of a fluid which exerts a pressure on the vessel walls from inside, in all directions. Under internal pressure, the stress distribution in the thickness of the thin-walled pressure vessels is normally assumed to be uniform or constant. The thin wall assumption lets us use a simplified approximate method of analysis on these pressure vessels. When r/t = 10, the results of a thin- wall analysis will predict a stress that is approximately 4% less then the actual maximum stress in the vessel. For larger r/t ratios this error will be even smaller. Cylindrical Pressure Vessels Consider the cylindrical vessel with a wall thickness of t and inner radius of r.
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