BS 1042-1-1.2:1989 - Measurement of fluid flow in closed conduits. Pressure differential devices - Specification for square-edged orifice plates and nozzles (with drain holes, in pipes below 50 mm diameter, as inlet and outlet devices) and other orifice plates
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This Section of BS 1042: Section 1.2 specifies the geometry and method of use for conical entrance orifice plates, quarter cicle orifice plates and eccentric oriffice plates.
BS 1042-1-1.2:1989 - Measurement of fluid flow in closed conduits. Pressure differential devices - Specification for square-edged orifice plates and nozzles (with drain holes, in pipes below 50 mm diameter, as inlet and outlet devices) and other orifice plates