NBN ISO 3966:2025

Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes (ISO 3966:2025)

ACTIVE

About this standard

Languages
English and French
Type
NBN
Standards committee
ISO/TC 30/SC 5 (Velocity and mass methods)
Status
ACTIVE
Publication date
21 October 2025
Replaces
NBN ISO 3966:2021
ICS Code
17.120.10 (Flow in closed conduits)
Withdrawn Date
Price
€ 58,00

About this training

Summary

< p class=" MsoBodyText" > < span lang=" EN-GB" > This document specifies a method for the determination in a closed conduit of the volume rate of flow of a regular flow< / span>


< p class=" ListNumber1" style=" mso-list: l0 level1 lfo1 " > < !-- [if !supportLists]--> < span lang=" EN-GB" style=" mso-fareast-font-family: Cambria mso-bidi-font-family: Cambria " > < span style=" mso-list: Ignore " > a)< span style=" font: 7.0pt ' Times New Roman' " >        < / span> < / span> < / span> < !--[endif]--> < span lang=" EN-GB" > of a fluid of substantially constant density or corresponding to a Mach number not exceeding 0,25,< / span>


< p class=" ListNumber1" style=" mso-list: l0 level1 lfo1 " > < !-- [if !supportLists]--> < span lang=" EN-GB" style=" mso-fareast-font-family: Cambria mso-bidi-font-family: Cambria " > < span style=" mso-list: Ignore " > b)< span style=" font: 7.0pt ' Times New Roman' " >        < / span> < / span> < / span> < !--[endif]--> < span lang=" EN-GB" > with substantially uniform stagnation temperature across the measuring cross-section,< / span>


< p class=" ListNumber1" style=" mso-list: l0 level1 lfo1 " > < !-- [if !supportLists]--> < span lang=" EN-GB" style=" mso-fareast-font-family: Cambria mso-bidi-font-family: Cambria " > < span style=" mso-list: Ignore " > c)< span style=" font: 7.0pt ' Times New Roman' " >         < / span> < / span> < / span> < !--[endif]--> < span lang=" EN-GB" > running full in the conduit, and< / span>


< p class=" ListNumber1" style=" mso-list: l0 level1 lfo1 " > < !-- [if !supportLists]--> < span lang=" EN-GB" style=" mso-fareast-font-family: Cambria mso-bidi-font-family: Cambria " > < span style=" mso-list: Ignore " > d)< span style=" font: 7.0pt ' Times New Roman' " >        < / span> < / span> < / span> < !--[endif]--> < span lang=" EN-GB" > under steady flow conditions.< / span>


< p class=" MsoBodyText" > < span lang=" EN-GB" > 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.< / span>