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Lecture 30: Thin-walled pressure vessels. Design, construction, and maintenance covered by the ASME Boiler and Pressure Vessel Code Can be subjected to internal as well as external pressure Power generation, fuel containers, pressurized gas storage, ... The hoop stress is exactly 2x the axial stress!
Thin-walled Pressure Vessels. A tank or pipe carrying a fluid or gas under a pressure is subjected to tensile forces, which resist bursting, developed across longitudinal and transverse sections.
What pressure is needed to expand a balloon, initially 3 in diameter and with a wall thickness of 0.1 , to a diameter of 30 ? The balloon is constructed of a rubber with
Thin Walled Pressure vessels. The cylindrical pressure vessel above has closed ends and contains a fluid at gauge pressure P as shown below. The outer diameter is D and the wall thickness is t. The term ‘thin-wall’ may be taken to mean that D/t > 10.
The analysis of a thin-walled internally-pressurised cylindrical vessel is similar to that of the spherical vessel. The main difference is that the cylinder has three different principal stress values, the circumferential stress, the radial stress, and the longitudinal stress .
Example 13.1 demonstrates calculation of the principal stresses and maximum in-plane shear stress for a cylindrical thin-walled pressure vessel. Example 13.2 combine the content from this section with stress transformation from Chapter 12 in order to find the stresses at specific orientations.
The most common method is based on a simple mechanics approach and is applicable to “thin wall” pressure vessels which by definition have a ratio of inner radius, r, to wall thickness, t, of r/t≥10.
