NF ISO 3966

NF ISO 3966

August 2021
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

National standards and national normative documents

Publication date

August 2021

Number of pages

64 p.

Reference

NF ISO 3966

ICS Codes

17.120.10   Flow in closed conduits

Classification index

X10-112

Print number

1

International kinship

ISO 3966:2020
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 X10-112
September 1977
Published document Cancelled
Measurement of fluid flow in closed conduites.velocity area method using pitot static tubes.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Spécifications
  • 5 Conception des tubes de Pitot
  • 6 Exigences relatives à l'utilisation des tubes de Pitot
  • 7 Positionnement du tube de Pitot
  • 8 Calcul de la vitesse
  • 9 Détermination de la vitesse débitante par intégration graphique du champ des vitesses
  • 10 Détermination de la vitesse débitante par intégration numérique du champ des vitesses
  • 11 Détermination de la vitesse débitante par des méthodes arithmétiques
  • 12 Corrections des mesures des vitesses locales
  • 13 Erreurs
  • Annexe A Tubes de Pitot
  • Annexe B Correction de la position de mesure de tubes de Pitot utilisés dans un écoulement à gradient transversal de vitesse
  • Annexe C Étude concernant la correction de la turbulence
  • Annexe D Amortissement des manomètres
  • Annexe E Mesurages avec un tube de Pitot dans un fluide compressible
  • Annexe F Détermination du coefficient m pour l'extrapolation au voisinage de la paroi
  • Annexe G Exemple de calcul de l'incertitude de mesure du débit à l'aide de tubes de Pitot
  • Bibliographie
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