prEN ISO 16911-1
(Main)Stationary source emissions - Manual and automatic determination of velocity and volume flow rate in ducts - Part 1: Manual reference method (ISO/DIS 16911-1:2025)
Stationary source emissions - Manual and automatic determination of velocity and volume flow rate in ducts - Part 1: Manual reference method (ISO/DIS 16911-1:2025)
ISO 16911-1:2013 specifies a method for periodic determination of the axial velocity and volume flow rate of gas within emissions ducts and stacks. It is applicable for use in circular or rectangular ducts with measurement locations meeting the requirements of EN 15259. Minimum and maximum duct sizes are driven by practical considerations of the measurement devices described within ISO 16911-1:2013.
ISO 16911-1:2013 requires all flow measurements to have demonstrable metrological traceability to national or international primary standards.
To be used as a standard reference method, the user is required to demonstrate that the performance characteristics of the method are equal to or better than the performance criteria defined in ISO 16911-1:2013 and that the overall uncertainty of the method, expressed with a level of confidence of 95 %, is determined and reported. The results for each method defined in ISO 16911-1:2013 have different uncertainties within a range of 1 % to 10 % at flow velocities of 20 m/s.
Methods further to these can be used provided that the user can demonstrate equivalence, based on the principles of CEN/TS 14793.
Emissionen aus stationären Quellen - Manuelle und automatische Bestimmung der Geschwindigkeit und des Volumenstroms in Abgaskanälen - Teil 1: Manuelles Referenzverfahren (ISO/DIS 16911‑1:2025)
Émissions de sources fixes - Détermination manuelle et automatique de la vitesse et du débit-volume d’écoulement dans les conduits - Partie 1: Méthode de référence manuelle (ISO/DIS 16911-1:2025)
L'ISO 16911‑1:2013 spécifie une méthode pour la détermination périodique de la vitesse axiale et du débit-volume du gaz dans les conduits et les cheminées à l'émission de sources fixes. Elle est applicable aux conduits rectangulaires ou circulaires ayant des sections de mesurage répondant aux exigences de l'EN 15259. Les tailles de conduit minimales et maximales sont liées à des considérations pratiques sur les dispositifs de mesurage décrits dans l'ISO 16911‑1:2013.
L'ISO 16911‑1:2013 exige que tous les mesurages de débit aient une traçabilité métrologique démontrable par rapport aux Normes internationales ou aux normes nationales de base.
Pour pouvoir l'utiliser comme méthode de référence normalisée, l'utilisateur est tenu de démontrer que les caractéristiques de performance de la méthode sont égales ou supérieures aux critères de performance définis dans l'ISO 16911‑1:2013 et que l'incertitude globale de la méthode, exprimée à un niveau de confiance de 95 %, est déterminée et déclarée. Pour chaque méthode définie dans l'ISO 16911‑1:2013, les résultats ont des incertitudes différentes comprises dans une plage de 1 à 10 % à des vitesses de 20 m/s.
D'autres méthodes que celles-ci peuvent être utilisées à condition que l'utilisateur puisse démontrer leur équivalence, sur la base des principes de la CEN/TS 14793.
Emisije nepremičnih virov - Ročno in avtomatsko določanje hitrosti in volumenskega pretoka v odvodnikih - 1. del: Ročna referenčna metod (ISO/DIS 16911-1:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Emisije nepremičnih virov - Ročno in avtomatsko določanje hitrosti in
volumenskega pretoka v odvodnikih - 1. del: Ročna referenčna metod (ISO/DIS
16911-1:2025)
Stationary source emissions - Manual and automatic determination of velocity and
volume flow rate in ducts - Part 1: Manual reference method (ISO/DIS 16911-1:2025)
Emissionen aus stationären Quellen - Manuelle und automatische Bestimmung der
Geschwindigkeit und des Volumenstroms in Abgaskanälen - Teil 1: Manuelles
Referenzverfahren (ISO/DIS 16911-1:2025)
Émissions de sources fixes - Détermination manuelle et automatique de la vitesse et du
débit-volume d’écoulement dans les conduits - Partie 1: Méthode de référence manuelle
(ISO/DIS 16911-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 16911-1
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 16911-1
ISO/TC 146/SC 1
Stationary source emissions —
Secretariat: BIS
Manual and automatic
Voting begins on:
determination of velocity and
2025-08-07
volume flow rate in ducts —
Voting terminates on:
2025-10-30
Part 1:
Manual reference method
Émissions de sources fixes — Détermination manuelle et
automatique de la vitesse et du débit-volume d'écoulement dans
les conduits —
Partie 1: Méthode de référence manuelle
ICS: 13.040.40
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 16911-1:2025(en)
DRAFT
ISO/DIS 16911-1:2025(en)
International
Standard
ISO/DIS 16911-1
ISO/TC 146/SC 1
Stationary source emissions —
Secretariat: BIS
Manual and automatic
Voting begins on:
determination of velocity and
volume flow rate in ducts —
Voting terminates on:
Part 1:
Manual reference method
Émissions de sources fixes — Détermination manuelle et
automatique de la vitesse et du débit-volume d'écoulement dans
les conduits —
Partie 1: Méthode de référence manuelle
ICS: 13.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland Reference number
ISO/DIS 16911-1:2025(en)
ii
ISO/DIS 16911-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms. 4
4.1 Symbols .4
4.2 Abbreviated terms .7
5 Principle . 7
5.1 General .7
5.2 Monitoring objectives.8
5.3 Principle of flow velocity determination at a point in the duct .8
5.4 Principle of measurement of volume flow rate .9
5.4.1 General .9
5.4.2 Principle of volume flow rate determination from point velocity measurements .9
5.4.3 Determination of volume flow rate using tracer dilution measurements .10
5.4.4 Determination of volume flow rate from plant thermal input .10
6 Selection of measurement technique. 10
6.1 Monitoring objective .10
6.2 Choice of measurement technique to determine point flow velocity .11
6.3 Choice of the measurement technique for volume flow rate and average flow
determination . . . 12
7 Measuring equipment .13
7.1 General . 13
7.2 Measurement of duct area . 13
8 Performance characteristics and requirements for differential pressure devices and
vane anemometers . 14
8.1 General .14
8.2 Differential pressure devices .14
8.3 Vane anemometers .16
9 Measurement procedure . 17
9.1 Measurement strategy .17
9.1.1 Site survey before measurement .17
9.1.2 Correction for time related flow variation for the characterisation of a velocity
profile .17
9.1.3 Consideration of flow measurement assembly surface area in relation to
measurement plane area .18
9.2 Determination of measurement plane and number of measurement points .18
9.3 Checks before sampling .18
9.3.1 General .18
9.3.2 Pre-test leak check . .19
9.3.3 Check on stagnation and reference pressure taps (S-type Pitot tube) .19
9.3.4 Tests of repeatability at a single point . 20
9.3.5 Swirl or cyclonic flow . 20
9.4 Quality control . 20
9.5 Measurement of flow at locations within the measurement plane .21
9.6 Post-measurement quality control .21
10 Calculation of results .22
10.1 General . 22
10.2 Measurement of velocity. 22
10.3 Determination of the mean velocity . 22
iii
ISO/DIS 16911-1:2025(en)
10.4 Correction of average velocity for wall effects . 22
10.5 Calculation of the volume flow rate from the average velocity . 23
10.6 Conversion of results to standard conditions . 23
10.6.1 General .
...
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