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A pressure vessel is a closed leak-tight container (normally cylindrical or spherical) designed to hold fluids (i.e, gases, liquids, or two-phase fluids) at a pressure substantially different (higher or lower) from the ambient pressure. They are usually made from carbon steel or stainless steel and assembled from plates by welding method. However, other materials like Aluminium, copper, non-metals, etc also find usage as pressure vessel material in some specific situations. Even though most pressure vessels are basically long cylinders with two heads at both ends, they can take the shape of a sphere or cone.
Examples of some widely used pressure vessels are columns, boilers, separators, knock-out drums, Towers, Bullet Tanks, Reactors, and Heat Exchangers. All these pressure vessels are extensively used in the oil and gas, petroleum refining, and chemical/petrochemical processing industries, and power plants have varying operating pressures and temperatures. However, note that an atmospheric storage tank is not a pressure vessel.
