NF ISO 3966

NF ISO 3966

July 2025
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.

Main informations

Collections

National standards and national normative documents

Publication date

July 2025

Number of pages

73 p.

Reference

NF ISO 3966

ICS Codes

17.120.10   Flow in closed conduits

Classification index

X10-112

Print number

1

International kinship

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)
NF ISO 3966
August 2021
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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