EN ISO 5167-6:2022

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 6: Wedge meters (ISO 5167-6:2022)

This document specifies the geometry and method of use (installation and operating conditions) of wedge meters when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.
NOTE 1    As the uncertainty of an uncalibrated wedge meter can be too large for a particular application, it could be deemed essential to calibrate the flow meter according to Clause 7.
This document gives requirements for calibration which, if applied, are for use over the calibrated Reynolds number range. Clause 7 could also be useful guidance for calibration of meters of similar design but which fall outside the scope of this document.
It also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 5167‑1.
This document is applicable only to wedge meters in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. Uncalibrated wedge meters can only be used within specified limits of pipe size, roughness, β (or wedge ratio) and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated wedge meters in pipes whose internal diameter is less than 50 mm or more than 600 mm, or where the pipe Reynolds numbers are below 1 × 104.
NOTE 2    A wedge meter has a primary element which consists of a wedge-shaped restriction of a specific geometry. Alternative designs of wedge meters are available; however, at the time of writing there is insufficient data to fully characterize these devices, and therefore these meters are calibrated in accordance with Clause 7.

Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit Kreisquerschnitt - Teil 6: Keil-Durchflussmesser (ISO 5167-6:2022)

Dieses Dokument legt die geometrischen Formen und Maße sowie die Anwendung (Einbau- und Betriebsbe
dingungen) von Keil-Durchflussmessern fest, die in voll durchströmte Leitungen eingebaut werden, um den Durchfluss des in der Leitung strömenden Fluids zu bestimmen.
ANMERKUNG1 Da die Messunsicherheit eines unkalibrierten Keil-Durchflussmessers für bestimmte Anwendungsfälle zu groß sein kann, könnte eine Kalibrierung des Durchflussmessers nach Abschnitt7 erforderlich sein.
Dieses Dokument enthält Anforderungen an die Kalibrierung, die, wenn sie angewendet werden, für den kali
brierten Bereich der Reynolds-Zahlen gelten. Abschnitt7 könnte auch ein nützlicher Leitfaden für die Kali
brierung von Durchflussmessern ähnlicher Ausführung sein, die jedoch nicht in den Anwendungsbereich des vorliegenden Dokuments fallen.
Dieses Dokument ist anwendbar in Verbindung mit den in ISO5167-1 festgelegten Anforderungen und enthält auch Hintergrundinformationen für die Berechnung des Durchflusses.
Dieses Dokument ist ausschließlich für Keil-Durchflussmesser anwendbar, in denen die Strömung in allen Messquerschnitten im Unterschallbereich liegt und das Fluid als einphasig betrachtet werden kann. Unkali
brierte Keil-Durchflussmesser können lediglich innerhalb festgelegter Grenzen von Rohrdurchmesser,
heit, β-Wert (oder Keilverhältnis) und Reynolds-Zahl angewendet werden. Dieses Dokument ist nicht für
sungen von pulsierenden Strömungen anwendbar. Es behandelt nicht die Anwendung von unkalibrierten Keil- Durchflussmessern in Rohrleitungen, deren Innendurchmesser geringer als 50mm oder größer als 600mm ist, oder wenn die auf den Rohrdurchmesser bezogene Reynolds-Zahl unter 1×104 liegt.
ANMERKUNG2 Ein Keil-Durchflussmesser verfügt über ein Primärelement, das aus einer keilförmigen Verengung mit spezifischen geometrischen Formen und Maßen besteht. Es stehen alternative Ausführungen von Keil-Durchflussmessern zur Verfügung; zum Zeitpunkt der Erstellung der Norm gibt es jedoch nicht genügend Daten, um diese Drosselgeräte voll
ständig zu beschreiben, weshalb diese Durchflussmesser nach Abschnitt7 kalibriert werden.

Mesurage de débit des fluides au moyen d'appareils déprimogènes insérés dans des conduites en charge de section circulaire - Partie 6: Débitmètres à coin (ISO 5167-6:2022)

Le présent document spécifie la géométrie et le mode d’emploi (conditions d’installation et d’utilisation) de débitmètres à coin insérés dans une conduite en charge dans le but de déterminer le débit du fluide s’écoulant dans cette conduite.
NOTE 1    Étant donné que l’incertitude d’un débitmètre à coin non étalonné risque d’être trop grande pour une application particulière, l’étalonnage du débitmètre conformément à l’Article 7 peut être considéré comme essentiel.
Le présent document fournit des exigences relatives à l’étalonnage qui, si elles sont appliquées, sont destinées à être utilisées sur la plage des nombres de Reynolds qui a été étalonnée. L’Article 7 peut également fournir des recommandations utiles relatives à l’étalonnage des appareils de mesure de conception similaire, mais qui n’entrent pas dans le domaine d’application du présent document.
Il fournit également des informations de fond nécessaires au calcul du débit et il est applicable conjointement avec les exigences stipulées dans l’ISO 5167‑1.
Le présent document est applicable uniquement aux débitmètres à coin pour lesquels l’écoulement reste subsonique dans tout le tronçon de mesure et où le fluide peut être considéré comme monophasique. Les débitmètres à coin non étalonnés ne peuvent être utilisés que dans des limites spécifiées de diamètre de conduite, de rugosité, de valeur de β (ou rapport du coin) et de nombre de Reynolds. Ce document n’est pas applicable au mesurage d’un écoulement pulsé. Il ne couvre pas l’utilisation de débitmètres à coin non étalonnés dans des conduites dont le diamètre intérieur est inférieur à 50 mm ou supérieur à 600 mm, ni les cas où les nombres de Reynolds associés à la tuyauterie sont inférieurs à 1 × 104.
NOTE 2    Un débitmètre à coin comporte un élément primaire composé d’une restriction en forme de coin de géométrie spécifique. D’autres conceptions de débitmètres à coin sont possibles; cependant, au moment de la rédaction du présent document, les données permettant de caractériser complètement ces appareils étaient insuffisantes et ces derniers sont donc étalonnés conformément à l’Article 7.

Merjenje pretoka fluida na osnovi tlačne razlike, povzročene z napravo, vstavljeno v polno zapolnjen vod s krožnim prerezom - 6. del: Merilniki klinov (ISO 5167-6:2022)

General Information

• Status: Published
• Publication Date: 01-Nov-2022
• ICS: 17.120.10 - Flow in closed conduits
• Technical Committee: CEN/SS F05 - Measuring insreuments
• Drafting Committee: CEN/SS F05 - Measuring insreuments
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Nov-2022
• Completion Date: 02-Nov-2022
• Ref Project: SIST EN ISO 5167-6:2022 - Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 6: Wedge meters (ISO 5167-6:2022)

Relations

• Replaces: EN ISO 5167-6:2019 - Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 6: Wedge meters (ISO 5167-6:2019)
• Effective Date: 09-Nov-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN ISO 5167-6:2019
Merjenje pretoka fluida na osnovi tlačne razlike, povzročene z napravo, vstavljeno
v polno zapolnjen vod s krožnim prerezom - 6. del: Merilniki klinov (ISO 5167-
6:2022)
Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full - Part 6: Wedge meters (ISO 5167-6:2022)
Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit
Kreisquerschnitt - Teil 6: Keil-Durchflussmesser (ISO 5167-6:2022)
Mesurage de débit des fluides au moyen d'appareils déprimogènes insérés dans des
conduites en charge de section circulaire - Partie 6: Débitmètres à coin (ISO 5167-
6:2022)
Ta slovenski standard je istoveten z: EN ISO 5167-6:2022
ICS:
17.120.10 Pretok v zaprtih vodih Flow in closed conduits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 5167-6
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 17.120.10 Supersedes EN ISO 5167-6:2019
English Version
Measurement of fluid flow by means of pressure
differential devices inserted in circular cross-section
conduits running full - Part 6: Wedge meters (ISO 5167-
6:2022)
Mesurage de débit des fluides au moyen d'appareils Durchflussmessung von Fluiden mit Drosselgeräten in
déprimogènes insérés dans des conduites en charge de voll durchströmten Leitungen mit Kreisquerschnitt -
section circulaire - Partie 6: Débitmètres à coin (ISO Teil 6: Keil-Durchflussmesser (ISO 5167-6:2022)
5167-6:2022)
This European Standard was approved by CEN on 25 September 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5167-6:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 5167-6:2022) has been prepared by Technical Committee ISO/TC 30
"Measurement of fluid flow in closed conduits" in collaboration with CCMC.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5167-6:2019.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 5167-6:2022 has been approved by CEN as EN ISO 5167-6:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 5167-6
Second edition
2022-10
Measurement of fluid flow by means of
pressure differential devices inserted
in circular cross-section conduits
running full —
Part 6:
Wedge meters
Mesurage de débit des fluides au moyen d'appareils déprimogènes
insérés dans des conduites en charge de section circulaire —
Partie 6: Débitmètres à coin
Reference number
ISO 5167-6:2022(E)
ISO 5167-6:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 5167-6:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of the method of measurement and computation . 2
5 Wedge meters .3
5.1 Field of application . 3
5.2 General shape . 4
5.3 Material and manufacture . 5
5.4 Pressure tappings . 5
5.5 Discharge coefficient, C . 6
5.5.1 Limits of use . 6
5.5.2 Discharge coefficient of the wedge meter . 6
5.6 Expansibility [expansion] factor, ε . 6
5.7 Uncertainty of the discharge coefficient, C . 7
5.8 Uncertainty of the expansibility [expansion] factor, ε . 7
5.9 Pressure loss . 7
6 Installation requirements .7
6.1 General . 7
6.2 Minimum upstream and downstream straight lengths for installations between
various fittings and the wedge meter . 7
6.3 Additional specific installation requirements for wedge meters . 8
6.3.1 Circularity and cylindricality of the pipe . 8
6.3.2 Roughness of the upstream and downstream pipe. 8
6.3.3 Positioning of a thermowell . 8
6.3.4 Bidirectional wedge meters . 9
7 Flow calibration of wedge meters .9
7.1 General . 9
7.2 Test facility . 9
7.3 Meter installation . . 9
7.4 Design of the test programme . 9
7.5 Reporting the calibration results . 10
7.6 Uncertainty analysis of the calibration . 10
7.6.1 General . 10
7.6.2 Uncertainty of the test facility . 10
7.6.3 Uncertainty of the discharge coefficient of the wedge meter . 10
Annex A (informative) Table of expansibility [expansion] factor .11
Annex B (informative) Use of Kd parameter .12
Bibliography .13
iii
ISO 5167-6:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed
conduits, Subcommittee SC 2, Pressure differential devices, in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/SS F05, Measuring instruments, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 5167-6:2019), which has been technically
revised.
The main changes are as follows:
— this document is consistent with ISO/IEC Guide 98-3;
— an error in Annex B has been corrected;
— the expansibility uncertainty is given as a relative uncertainty for ease of use with Part 1 (the
calculated flow rate uncertainty is unchanged).
A list of all the parts in the ISO 5167 series can be found on the ISO website.
iv
ISO 5167-6:2022(E)
Introduction
ISO 5167, consisting of six parts, covers the geometry and method of use (installation and operating
conditions) of orifice plates, nozzles, Venturi tubes, cone and wedge meters when they are inserted in a
conduit running full to determine the flow rate of the fluid flow in the conduit. It also gives necessary
information for calculating the flow rate and its associated uncertainty.
ISO 5167 (all parts) is applicable only to pressure differential devices in which the flow remains
subsonic throughout the measuring section and where the fluid can be considered as single-phase, but
it is not applicable to the measurement of pulsating flow. Furthermore, each of these devices can only
be used within specified limits of pipe size and Reynolds number, Re.
ISO 5167 (all parts) deals with devices for which direct calibration experiments have been made,
sufficient in number, spread and quality to enable coherent systems of application to be based on their
results and coefficients to be given with certain predictable limits of uncertainty. However, for wedge
meters calibrated in accordance with Clause 7, a wider range of pipe size, β and Reynolds number can
be considered.
The devices introduced into the pipe are called primary devices. The term primary device also includes
the pressure tappings. All other instruments or devices required to facilitate the instrument readings
are known as secondary devices, and the flow computer that receives these readings and performs
the algorithms is known as a tertiary device. ISO 5167 (all parts) covers primary devices; secondary
devices (see ISO 2186) and tertiary devices will be mentioned only occasionally.
Aspects of safety are not dealt with in ISO 5167-1 to ISO 5167-6. It is the responsibility of the user to
ensure that the system meets applicable safety regulations.
v
INTERNATIONAL STANDARD ISO 5167-6:2022(E)
Measurement of fluid flow by means of pressure
differential devices inserted in circular cross-section
conduits running full —
Part 6:
Wedge meters
1 Scope
This document specifies the geometry and method of use (installation and operating conditions) of
wedge meters when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
NOTE 1 As the uncertainty of an uncalibrated wedge meter can be too large for a particular application, it
could be deemed essential to calibrate the flow meter according to Clause 7.
This document gives requirements for calibration which, if applied, are for use over the calibrated
Reynolds number range. Clause 7 could also be useful guidance for calibration of meters of similar
design but which fall outside the scope of this document.
It also provides background information for calculating the flow rate and is applicable in conjunction
with the requirements given in ISO 5167-1.
This document is applicable only to wedge meters in which the flow remains subsonic throughout the
measuring section and where the fluid can be considered as single-phase. Uncalibrated wedge meters
can only be used within specified limits of pipe size, roughness, β (or wedge ratio) and Reynolds number.
It is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated wedge
meters in pipes whose internal diameter is less than 50 mm or more than 600 mm, or where the pipe
Reynolds numbers are below 1 × 10 .
NOTE 2 A wedge meter has a primary element which consists of a wedge-shaped restriction of a specific
geometry. Alternative designs of wedge meters are available; however, at the time of writing there is insufficient
data to fully characterize these devices, and therefore these meters are calibrated in accordance with Clause 7.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4006, Measurement of fluid flow in closed conduits — Vocabulary and symbols
ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-
section conduits running full — Part 1: General principles and requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4006, ISO 5167-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
ISO 5167-6:2022(E)
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
wedge gap
h
maximum gap between the apex of the wedge element and the pipe wall, in the plane perpendicular to
the pipe axis
Note 1 to entry: See Figure 1.
3.2
wedge ratio
ratio of the wedge gap (3.1) to the meter inlet diameter, D
Note 1 to entry: See ISO 4006:1991, Clause 2, for the meter inlet diameter, D.
3.3
wedge throat area
A
t
minimum cross-sectional open area of the wedge meter
4 Principles of the method of measurement and computation
The principle of the method of measurement is based on the installation of the wedge meter into a
pipeline in which a fluid is running full. Flow through a wedge meter produces a differential pressure
between the upstream and downstream tappings.
The mass flow rate can be determined by the following formulae:
C π
q = εβDp2Δ ρ (1)
()
m 1
4 4
1−β
and
4A
t
β = (2)
πD
A larger β corresponds to a larger wedge gap height, h (see Figure 1), and therefore a larger wedge
throat area, A . The value of β can be calculated using Formula (3):
t
 
1 2h 2h h h
     
 
β =−arccos 1 −−21 ×− (3)
     
π  D   D  D D
 
 
NOTE For example, h/D = 0,5 does not correspond to β = 0,5, but to β = √0,5 ≈ 0,707. β = 0,5 corresponds to
h/D ≈ 0,298.
ISO 5167-6:2022(E)
a
Direction of flow.
Figure 1 — Wedge meter showing different
...