Pressure vessel is a closed container designed to grasp gases or liquids at a pressure substantially different from the ambient pressure.The pressure differential is dangerous and a lot of fatal accidents have occurred in the history of pressure vessel development and operation. Consequently, engineering authorities backed by legislation regulates pressure vessel design, manufacture, and operation. For these reasons, the definition of a pressure vessel varies from country to country, but involves parameters such as maximum safe operating pressure and temperature.

Pressure vessels can theoretically be approximately any shape, but shapes made of sections of spheres, cylinders, and cones are usually employed. A common design is a cylinder with end caps called heads. Head shapes are frequently either hemispherical or dished (torispherical). More complicated shapes have historically been to a great extent harder to analyze for safe operation and are usually far more difficult to construct.


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