BS 1042-1-1.2:1984
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 and Borda inlets
Specifies the geometry and method of use of conical entrance orifice plates, quarter circle orifice plates, eccentric orifice plates and Borda inlets for air measurement. Also specifies requirements for square-edged orifice plates and nozzles under conditions outside the scope of BS 1041:Section 1.1.
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