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The Pressure vessels (cylinder or tank) are used to store fluids under pressure. If the pressure vessel are design in the form of column to separate the gas at upper portion and liquid is collected at bottom so called column generally a pressure vessel (column).
Pressure Vessel is an equipment that handels or bare pressures greater or lower than the atmospheric pressure.
Second, Column is a vertical standing equipment whose purpose is to segrigate gases from liquides thru trays
