International Standard
ISO 3966:2025
Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes
Reference number
ISO 3966:2025
Edition 4
2025-07
© ISO 2026
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Published (Edition 4, 2025)

ISO 3966:2025

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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2025-07
    Stage
    : International Standard published [60.60]
  • Edition
     : 4
    Number of pages
     : 63
  • Technical Committee :
    ISO/TC 30/SC 5
    ICS :
    17.120.10 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal

9
Industry, Innovation and Infrastructure

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  4. ICS
  5. 17
  6. 17.120
  7. 17.120.10
  8. ISO 3966:2025