ISO/TR 15377:1998, Measurement of fluid flow by means of pressure-differential devices - Guide for the specification of nozzles and orifice plates beyond the scope of ISO 5167-1

This Technical Report describes the geometry and method of use for conical-entrance orifice plates, quarter-circle orifice plates and eccentric orifice plates. Recommendations are also given for square-edged orifice plates and nozzles under conditions outside the scope of ISO 5167-1.