ISO 3966:2025
ISO 3966:2025 Measurement of fluid flow in closed conduits - Velocity area method using Pitot static tubes
standard byInternational Organization for Standardization , 07/01/2025
standard byInternational Organization for Standardization , 07/01/2025
This document specifies a method for the determination in a closed conduit of the volume rate of flow of a regular flow
u000ba) of a fluid of substantially constant density or corresponding to a Mach number not exceeding 0,25,
u000bb) with substantially uniform stagnation temperature across the measuring cross-section,
u000bc) running full in the conduit, and
u000bd) under steady flow conditions.
u000bIn particular, it deals with the technology and maintenance of Pitot static tubes, with the calculation of local velocities from measured differential pressures and with the computation of the flow rate by velocity integration.