Section 56(1) in The West Bengal Factories Rules, 1958
(1)In this rule (a)'Design pressure' means the maximum pressure that a pressure vessel or plant is designed to withstand sagely when operating normally;(b)'Maximum permissible working pressure' is the maximum pressure at which a pressure vessel or plant is permitted to be operated or sude under this rule and is determined by the technical requirements of the process;(c)'Plant' means a system of piping that is connected to a pressure vessel and is used to contain any gas, vapour or liquid under pressure greater than the atmosphere, and includes the pressure vessel; and(d)'Pressure vessel' means a vessel that may be used for containing storing, distributing, transferring, distilling, processing or otherwise handing any gas, vapour or liquid under pressure greater than the atmospheric pressure and includes any pipeline, fitting or other equipment attached thereto or used in connection therewith.
