EN ISO 10723:2002
(Main)Natural gas - Performance evaluation for on-line analytical systems (ISO 10723:1995, including Technical Corrigendum 1:1998)
Natural gas - Performance evaluation for on-line analytical systems (ISO 10723:1995, including Technical Corrigendum 1:1998)
Describes a method of assessing whether an analytical system for natural gas is satisfactory provided that the analytical requirements have been clearly defined and the analytical and calibration procedures have been fully described.
Erdgas - Bewertung der Leistungsfähigkeit von On-line-Analysensystemen (ISO 10723:1995, einschließlich Technische Korrektur 1:1998)
Diese Internationale Norm legt ein Verfahren fest, mit dessen Hilfe ermittelt werden kann, ob ein Erdgas-Analysesystem zufriedenstellend arbeitet, und zwar unter den Voraussetzungen, dass
a) die analytischen Anforderungen in Bezug auf den Bereich und die Unsicherheit der Messung der Konzentration der Komponenten sowie der Unsicherheit der aus diesen Messungen berechneten Eigenschaftsgrößen klar und eindeutig definiert sind;
b) das Analyse- sowie das Kalibrierverfahren vollständig beschrieben sind;
c) die Methode dazu bestimmt ist, auf Gase angewendet zu werden, deren Zusammensetzung in Bereichen variiert, wie man sie im Normalfall in Transport- und Versorgungsnetzen vorfindet.
Sofern das Verfahren zur Leistungsbewertung das System als nicht zufriedenstellend einschätzt, sind alle Etappen, nämlich
die analytischen Anforderungen,
das Analyseverfahren,
die Geräteauswahl,
die Auswahl der Kalibriergase,
das Berechnungsverfahren,
unter dem Blickwinkel der Testergebnisse zu überprüfen, um zu beurteilen, wo Verbesserungen erreicht werden können.
Diese Internationale Norm ist auf Analysesysteme anwendbar, die die Konzentrationen der Komponenten sowie deren Unsicherheiten liefern. Nach jetzigem Stand des Wissens wird das Verfahren der Wahl wohl am ehesten die Gaschromatographie sein.
Die Bewertung der Leistungsfähigkeit eines Analysesystems sollte während des Systemaufbaus, danach in Abhängigkeit vom Anwendungsbereich in regelmäßigen Abständen und/oder immer dann erfolgen, wenn ein kritischer Bestandteil des Analysesystems verändert oder ausgetauscht worden ist.
Gaz naturel - Evaluation des performances des systèmes d'analyse en ligne (ISO 10723:1995, Rectificatif Technique 1:1998 inclus)
Zemeljski plin – Vrednotenje zmogljivosti “on-line” analitskih sistemov (ISO 10723:1995)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2002
Zemeljski plin – Vrednotenje zmogljivosti “on-line” analitskih sistemov (ISO
10723:1995)
Natural gas - Performance evaluation for on-line analytical systems (ISO 10723:1995,
including Technical Corrigendum 1:1998)
Erdgas - Bewertung der Leistungsfähigkeit von On-line-Analysensystemen (ISO
10723:1995, einschließlich Technische Korrektur 1:1998)
Gaz naturel - Evaluation des performances des systemes d'analyse en ligne (ISO
10723:1995, Rectificatif Technique 1:1998 inclus)
Ta slovenski standard je istoveten z: EN ISO 10723:2002
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 10723
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2002
ICS 75.060
English version
Natural gas - Performance evaluation for on-line analytical
systems (ISO 10723:1995)
Gaz naturel - Evaluation des performances des systèmes Erdgas - Bewertung der Leistungsfähigkeit von On-line-
d'analyse en ligne (ISO 10723:1995) Analysensystemen (ISO 10723:1995)
This European Standard was approved by CEN on 19 August 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10723:2002 E
worldwide for CEN national Members.
CORRECTED 2002-11-13
Foreword
The text of ISO 10723:1995 has been prepared by Technical Committee ISO/TC 193 "Natural
gas” of the International Organization for Standardization (ISO) and has been taken over as
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 March 2003, and conflicting national
standards shall be withdrawn at the latest by March 2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10723:1995 has been approved by CEN as EN ISO 10723:2002 without any
modifications.
INTERNATIONAL
ISO
STANDARD
First edition
1995-12-15
Natura1 gas - Performance evaluation for
on-line analytical Systems
Gaz na turel - haluation des petformances des systemes d ’analyse en
ligne
Reference number
ISO 10723: 1995(E)
ISO 10723:1995(E)
Contents
Page
1 Scope .
....................... .................. 1
2 Normative references . .
......................... .......... 1
..........................................
3 Principle . . . 2
4 Suitability of analytical Systems
....... ......................................... 2
. . . . . . . . . . . . . . . . . . .*.m.
5 Test gases .I. 3
. . . . . . . . . . . . . . . .
5.1 Definition
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Test gas compositions . . . . . . . . . . . . . . . . . . . . . . .*. 4
6 Test procedures . . . . . . . . . . .
6.1 System efficiency test . .
6.2 Repeatability . . . . . . . . . . . . . .
6.3 Response concentration relationship .
6.4 Component separationlinterference
..................................... 13
7 Evaluation of results . . .
7.1 System efficiency .
................................. 14
7.2 Repeatability . .
................. 14
7.3 Response/concentration relationship
................................... 14
7.4 Component separation/interference
..................................... 15
7.5 Further testing and evaluation . . 15
Annexes
A Example of application using chromatography . 16
B Statistical tests and methods .
..................... 31
C Bibliography . .
..................... 43
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
0 ISO ISO 10723:1995(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. Esch 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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 10723 was prepared by Technical Committee
ISO/TC 193, Natura/ gas, Subcommittee SC 1, Analysis of natura/ gas.
Annexes A, B and C of this International Standard are for information only.
. . .
Ill
0 ISO
ISO 10723:1995(E)
This International Standard describes a method for evaluating the per-
formante of analytical Systems intended for the analysis of natura1 gas.
Natura1 gas is assumed to consist predominantly of methane, with other
saturated hydrocarbons and non-combustible gases.
Performance evaluation makes no assumptions about equipment for
and/or methodology of analysis, but gives test methods which tan be ap-
plied to the Chosen analytical System, including the method, equipment
and Sample handling.
This International Standard contains an informative annex (annex A) which
Shows the application for an on-line gas chromatographic System which,
as described, is assumed to have a response/concentration relationship for
all components which is represented by a straight line through the origin.
lt contains two additional informative annexes (annexes B and C).
INTERNATIONAL STANDARD 0 ISO ISO 10723:1995(E)
Natura1 gas - Performance evaluation for on-line
analytical Systems
1 Scope
This International Standard specifies a method of determining whether an analytical System for natura1 gas is sat-
isfactory, on the assumptions that
a) the analytical requirement has been clearly and unambiguously defined, for the range and uncertainty of
component concentration measurements, and the uncertainty of properties which may be calculated from
these measurements;
b) the analytical and calibration procedures have been fully described;
c) the method is intended to be applied to gases having compositions which vary over ranges normally found in
transmission and distribution networks.
If the Performance evaluation Shows the System to be unsatisfactory, all the stages, such as
- the analytical requirement;
- the analytical procedure;
- the choice of equipment;
- the choice of calibration gas;
- the calculation procedure;
must be re-examined in the light of the test data to assess where improvements tan be obtained.
This International Standard is applicable to analytical Systems which give the component concentrations and re-
sulting uncertainties. With the present state of knowledge, the method Chosen is likely to be gas chromatography.
Performance evaluation of an analytical System should be performed during installation, then at regular intervals,
according to the application, and/or whenever any critical component of the analytical System is changed or re-
placed.
2 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and Parties to agreements based on this International Standard are encouraged to investigate the possi-
bility of applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
0 ISO
ISO 10723:1995(E)
Preparation of calibration gas mixtures - Weighing methods.
ISO 6142:1981, Gas analysis -
ISO 6974:1984, Natura1 gas - Determination of hydrogen, inert gases and hydrocarbons up to C8 - Gas chro-
ma tographic me thod.
ISO 6976:1995, Natura/ gas - Cakulation of calorific values, density, relative density and Wobbe index from
composition.
ISO 7504:1984, Gas analysk - Vocabulary.
3 Principle
The analytical System is set up according to the instructions so as to carry out the specified compositional analysis.
The effectiveness of the System is demonstrated by analysing test gases with compositions covering a range
rather wider than that for which the System has been specified.
Test gases prepared according to an appropriate Standard are injected into the analyser to test:
the ability of the System to measure the components specified in the analytical method (System efficiency);
a)
the repeatability of measurement of individual components over their specified ranges;
b)
the relationship between response and concentration of individual components over their specified ranges;
d
the absence of interference between components at different concentration ratios.
d)
The tests required for b) and c) above are conducted over intervals of time comparable with the normal period of
use between regular calibrations. Because a number of Parameters which tan influence the analytical Performance
may vary on a day-to-day basis (barometric pressure variations are a case in Point), it is recommended that the
tests be repeated on at least three separate intervals, so that occasional inconsistencies may be recognized.
However, it is acknowledged that there are circumstances (such as testing analysers installed in remote locations)
where only a Single set of tests tan be obtained.
The results of the tests are analysed to assess analyser Performance with respect to bias, repeatability and inter-
ference. The repeatability test b) Shows the random error associated with the measurement of a component and
whether this varies with concentration. The response function c) Shows the likelihood of bias error arising from
different component concentrations in the calibration Standard and Sample; bias tan also result from component
interference d).
Accuracy of measurement is not included in this list, since analytical accuracy is fundamentally and principally
controlled by the accuracy with which the calibration gas composition is known. The procedures described in this
International Standard allow a judgement as to the ability of the analytical method to provide accurate results if
used with an accurate and appropriate calibration gas.
4 Suitability of analytical Systems
The analytical System to be evaluated shall satisfy the following criteria.
The analytical requirement has been carefully defined, for the range and uncertainty of component concen-
tration measurement, or of physical or Chemical property calculation, or of both.
b) The analytical and calibration procedures, whether manual or automated, laboratory or process, have been fully
described, preferably following appropriate interlaboratory testing. Changes in details of the method are not
permissible during the series of tests. If, at the end of the tests, it is clear that the method fails to provide the
desired Performance, it shall be modified suitably and the entire test procedure reapplied.
0 ISO ISO 10723:1995(E)
c) The method is not intended to be applied to gases having composition or physical or Chemical properties that
vary over a wider range than would be acceptable for mixing into a normal transmission or distribution System.
Thus, in practical terms, it is unlikely that the concentration will vary for an individual component by more than
a factor of 20, and the Variation for most components,is likely to be less than a factor of 10.
d) The analytical System shall be capable of measuring, either individually or in g
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.