EN ISO 5167-5:2016

SLOVENSKI STANDARD
01-junij-2016
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Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full - Part 5: Cone meters (ISO 5167-5:2016)
Durchflussmessung von Fluiden mit Drosselgeräten in voll durchströmten Leitungen mit
Kreisquerschnitt - Teil 5: Konus-Durchflussmesser (ISO 5167-5:2016)
Mesure de débit des fluides au moyen d'appareils déprimogènes insérés dans des
conduites en charge de section circulaire - Partie 5: Dispositifs de mesure avec cône de
mesure (ISO 5167-5:2016)
Ta slovenski standard je istoveten z: EN ISO 5167-5:2016
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 5167-5
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 17.120.10
English Version
Measurement of fluid flow by means of pressure
differential devices inserted in circular cross-section
conduits running full - Part 5: Cone meters (ISO 5167-
5:2016)
Mesure 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 5: Cônes de mesure (ISO Teil 5: Konus-Durchflussmesser (ISO 5167-5:2016)
5167-5:2016)
This European Standard was approved by CEN on 4 February 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5167-5:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 5167-5:2016) has been prepared by Technical Committee ISO/TC 30
"Measurement of fluid flow in closed conduits".
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 September 2016, and conflicting national standards
shall be withdrawn at the latest by September 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
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, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 5167-5:2016 has been approved by CEN as EN ISO 5167-5:2016 without any
modification.
INTERNATIONAL ISO
STANDARD 5167-5
First edition
2016-03-01
Measurement of fluid flow by means of
pressure differential devices inserted
in circular cross-section conduits
running full —
Part 5:
Cone meters
Mesure de débit des fluides au moyen d’appareils déprimogènes
insérés dans des conduites en charge de section circulaire —
Partie 5: Cônes de mesure
Reference number
ISO 5167-5:2016(E)
©
ISO 2016
ISO 5167-5:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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.
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 5167-5:2016(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 Cone meters . 3
5.1 Field of application . 3
5.2 General shape . 4
5.3 Material and manufacture . 7
5.4 Pressure tappings . 8
5.5 Discharge coefficient, C .8
5.5.1 Limits of use . 8
5.5.2 Discharge coefficient of the cone meter . 8
5.6 Expansibility (expansion) factor, ε .9
5.7 Uncertainty of the discharge coefficient, C .9
5.8 Uncertainty of the expansibility (expansion) factor, ε .9
5.9 Pressure loss . 9
6 Installation requirements.10
6.1 General .10
6.2 Minimum upstream and downstream straight lengths for installations between
various fittings and the cone meter .10
6.2.1 General.10
6.2.2 Single 90° bend . . .11
6.2.3 Two 90° bends in perpendicular planes .11
6.2.4 Concentric expander .11
6.2.5 Partially closed valves .11
6.3 Additional specific installation requirements for cone meters .11
6.3.1 Circularity and cylindricality of the pipe .11
6.3.2 Roughness of the upstream and downstream pipe .11
6.3.3 Positioning of a thermowell .11
7 Flow calibration of cone meters .12
7.1 General .12
7.2 Test facility .12
7.3 Meter installation.12
7.4 Design of the test programme .12
7.5 Reporting the calibration results .13
7.6 Uncertainty analysis of the calibration .13
7.6.1 General.13
7.6.2 Uncertainty of the test facility .13
7.6.3 Uncertainty of the cone meter .13
Annex A (informative) Table of expansibility (expansion) factor .14
Bibliography .15
ISO 5167-5:2016(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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 30, Measurement of fluid flow in closed conduits,
Subcommittee SC 2, Pressure differential devices.
The first edition of ISO 5167-5 is complementary to ISO 5167-1, ISO 5167-2, ISO 5167-3, and ISO 5167-4.
ISO 5167 consists of the following parts, under the general title Measurement of fluid flow by means of
pressure differential devices inserted in circular cross-section conduits running full:
— Part 1: General principles and requirements
— Part 2: Orifice plates
— Part 3: Nozzles and Venturi nozzles
— Part 4: Venturi tubes
— Part 5: Cone meters
iv © ISO 2016 – All rights reserved

ISO 5167-5:2016(E)
Introduction
This International Standard, divided into five parts, covers the geometry and method of use (installation
and operating conditions) of orifice plates, nozzles, Venturi tubes, and cone meters when they are
inserted in a conduit running full to determine the flow rate of the fluid in the conduit. It also gives
necessary information for calculating the flow rate and its associated uncertainty.
This International Standard 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.
This International Standard 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
cone meters calibrated in accordance with Clause 7, a wider range of pipe size, β, and Reynolds number
may 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 for the measurement are known as
[1][5]
“secondary devices”. This International Standard covers primary devices; secondary devices will
be mentioned only occasionally.
This International Standard is divided into the following five parts:
a) ISO 5167-1 gives general terms and definitions, symbols, principles, and requirements as well
as methods of measurement and uncertainty that are to be used in conjunction with ISO 5167-1,
ISO 5167-2, ISO 5167-3, ISO 5167-4, and ISO 5167-5.
b) ISO 5167-2 specifies requirements for orifice plates, which can be used with corner pressure
1)
tappings, D and D/2 pressure tappings , and flange pressure tappings.
2)
c) ISO 5167-3 specifies requirements for ISA 1932 nozzles , long radius nozzles, and Venturi nozzles,
which differ in shape and in the position of the pressure tappings.
3)
d) ISO 5167-4 specifies requirements for classical Venturi tubes .
e) This part of ISO 5167 specifies requirements for cone meters and includes a section on calibration.
Aspects of safety are not dealt with in ISO 5167 (all parts). It is the responsibility of the user to ensure
that the system meets applicable safety regulations.
1) Orifice plates with ‘vena contracta’ pressure tappings are not considered in ISO 5167 (all parts).
2) ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was
succeeded by ISO in 1946.
3) In the USA, the classical Venturi tube is sometimes called the Herschel Venturi tube.
INTERNATIONAL STANDARD ISO 5167-5:2016(E)
Measurement of fluid flow by means of pressure
differential devices inserted in circular cross-section
conduits running full —
Part 5:
Cone meters
1 Scope
This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions)
of cone meters when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
As the uncertainty of an uncalibrated cone meter might be too high for a particular application, it might
be deemed essential to calibrate the flow meter in accordance with Clause 7.
This part of ISO 5167 also provides background information for calculating the flow rate and is
applicable in conjunction with the requirements given in ISO 5167-1.
This part of ISO 5167 is applicable only to cone meters in which the flow remains subsonic throughout
the measuring section and where the fluid can be considered as single-phase. Uncalibrated cone meters
can only be used within specified limits of pipe size, roughness, β, and Reynolds number. This part of
ISO 5167 is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated
cone meters in pipes sized less than 50 mm or more than 500 mm, or where the pipe Reynolds numbers
4 7
are below 8 × 10 or greater than 1,2 × 10 .
A cone meter is a primary device which consists of a cone-shaped restriction held concentrically in the
centre of the pipe with the nose of the cone upstream. The design of cone meter defined in this part of
ISO 5167 has one or more upstream pressure tappings in the wall, and a downstream pressure tapping
positioned in the back face of the cone with the connection to a differential pressure transmitter being
a hole through the cone to the support bar, and then up through the support bar.
Alternative designs of cone meters are available; however, at the time of writing, there is insufficient
data to fully characterize these devices, and therefore, these meters shall be calibrated in accordance
with Clause 7.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 5167-1:2003, 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 5167-5:2016(E)
3.1
beta edge
maximum circumference of the cone
4 Principles of the method of measurement and computation
The principle of the method of measurement is based on the installation of the cone meter into a pipeline
in which a fluid is running full. Flow through a cone meter produces a differential pressure between the
upstream and downstream tappings.
The mass flow rate can be determined by Formulae (1) and (2):
C π
q = ε Dpβρ2Δ (1)
()
m 1
1−β
and
d
c
β =−1 (2)
D
where d is the diameter of the cone in the plane of the beta edge. This assumes that the diameter of
c
the pipe at the upstream tapping, D , is equal to the diameter of the pipe at the beta edge, D. Figure 1
TAP
shows that as the cone diameter increases, β decreases.
Key
1 flow
Figure 1 — Cone meter showing different values of β
2 © ISO 2016 – All rights reserved

ISO 5167-5:2016(E)
The uncertainty limits can be calculated using the procedure given in ISO 5167-1:2003, Clause 8, except
that Formula (3) should be used instead of ISO 5167-1:2003, Formula (3)
12/
 2 2 2
22 2
   
 
δq δd   δρρ 
δδC   ε  21()++ββ δD 2 1 δDp 1
m c 1
 
= + +  +  + +
   
 
     
22 22
     
q C ε D d 4 Dp 4 ρ
    ββ()1+   ββ()1+
m  c     1 
 
 
 
 
(3)
Similarly, the value of the volume flow rate can be calculated since
q
m
q = (4)
V
ρ
where ρ is the fluid density at the temperature and pressure for which the volume is stated.
Computation of the flow rate, which is a purely arithmetic process, is performed by replacing the
different items on the right-hand side of Formula (1) by their numerical values. Formula (5) in 5.6 (or
the computed values in Table A.1) gives cone meter expansibility factors (ε). The values in Table A.1
are not intended for precise interpolation. Extrapolation is not permitted. However, the coefficient
of discharge, C, is generally dependent on the Reynolds number, Re, which is itself dependent on q ,
m
and has to be obtained by iteration (see ISO 5167-1:2003, Annex A for guidance regarding the choice of
iteration procedure and initial estimates).
The diameters, d and D, mentioned in Formulae (1) and (2) are the values of the diameters at working
c
conditions. Measurements taken at any other conditions should be corrected for any possible expansion
or contraction of the primary device and the pipe due to the values of the temperature and pressure of
the fluid during the measurement.
As the cone meter flow rate calculation is particularly sensitive to the pipe and cone diameter values
used, the user shall ensure that these are correctly entered into the flow computation calculations. For
example, care shall be taken to use the measured internal diameter rather than a nominal value.
It is necessary to know the density and the viscosity of the fluid at working conditions. In the case
of a compressible fluid, it is also necessary to know the isentropic exponent of the fluid at working
conditions.
NOTE The turndown of all differential pressure flow meters is dependent upon the differential pressure
range. Typically, a 10:1 turndown in flow rate (equivalent to 100:1 turndown in differential pressure) can be
achieved.
5 Cone meters
5.1 Field of application
Uncalibrated cone meters can be used in pipes with diameters between 50 mm and 500 mm and with
0,45 ≤ β ≤ 0,75. Cone meters with β > 0,75 shall be calibrated. Cone meters with values of β < 0,45 are
not normally manufactured.
There are limits to the roughness and Reynolds number which shall be addressed.
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...