ISO 3966:2025

ISO 3966:2025

July 2025
International standard Current

Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes

This document specifies a method for the determination in a closed conduit of the volume rate of flow of a regular flowa)       of a fluid of substantially constant density or corresponding to a Mach number not exceeding 0,25,b)       with substantially uniform stagnation temperature across the measuring cross-section,c)        running full in the conduit, andd)       under steady flow conditions.In 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.

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Main informations

Collections

International ISO standards

Publication date

July 2025

Number of pages

63 p.

Reference

ISO 3966:2025

ICS Codes

17.120.10   Flow in closed conduits

Print number

4
Sumary
Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes

This document specifies a method for the determination in a closed conduit of the volume rate of flow of a regular flow

a)       of a fluid of substantially constant density or corresponding to a Mach number not exceeding 0,25,

b)       with substantially uniform stagnation temperature across the measuring cross-section,

c)        running full in the conduit, and

d)       under steady flow conditions.

In 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.

Replaced standards (1)
ISO 3966:2020
July 2020
International standard Cancelled
Measurement of fluid flow in closed conduits - Velocity area method using Pitot static tubes

This document specifies a method for the determination in a closed conduit of the volume rate of flow of a regular flow a) of a fluid of substantially constant density or corresponding to a Mach number not exceeding 0,25, b) with substantially uniform stagnation temperature across the measuring cross-section, c) running full in the conduit, and d) under steady flow conditions. In 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.

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