1、Petroleum products Equivalency of test method determining the same property Part 100: Background and principle of the comparison and the evaluation of equivalency PD ISO/TR 19686-100:2016 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National foreword This Publish
2、ed Document is the UK implementation of ISO/TR 19686-100:2016. The UK participation in its preparation was entrusted to Technical Committee PTI/2, Liquid Fuels. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to inc
3、lude all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 92995 3 ICS 75.080 Compliance with a British Standard cannot confer immunity from legal obligations. This
4、 Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 December 2016. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD ISO/TR 19686-100:2016 ISO 2016 Petroleum products Equivalency of test method determining t
5、he same property Part 100: Background and principle of the comparison and the evaluation of equivalency Produits ptroliers quivalence des mthodes dessai dterminant la mme proprit Partie 100: Fondement et principe de la comparaison et de lvaluation de lquivalence TECHNICAL REPORT ISO/TR 19686-100 Ref
6、erence number ISO/TR 19686-100:2016(E) First edition 2016-12-01 PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reprodu
7、ced 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 ISOs member body in the country of the requester.
8、ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4
9、 Comparison 1 4.1 Reasons for divergence 1 4.2 Equivalency 1 5 Questionnaire for checking similarities of test methods . 2 ISO 2016 All rights reserved iii Contents Page PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide
10、 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
11、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 docume
12、nt 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
13、, 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
14、 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 speci
15、fic terms and expressions related to conformit y assessment, as well as information about ISOs 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. The committee responsible for this document is ISO/
16、TC 28, Petroleum products and related products of synthetic or biological origin. A list of the parts of ISO/TR 19686 can be found on the ISO website.iv ISO 2016 All rights reserved PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E) Introduction In 2010 ISO/TC 28 established a working group to invest
17、igate the development of test method equivalency tables. This proposal resulted from the discussion about identities, equivalences or differences in test methods related to fuels. It was concluded that a more structured approach would be useful. The task of determining equivalency appeared to be a d
18、ifficult and complex one; it was therefore decided that each property would be taken into account in turn and addressed in separate Technical Reports. In 2014 ISO/TC 28 agreed that a base document would be developed to show how the experts effectively compared the test method standards and evaluated
19、 their equivalency. This document gives that guidance. ISO 2016 All rights reserved v PD ISO/TR 19686-100:2016PD ISO/TR 19686-100:2016 Petroleum products Equivalency of test method determining the same property Part 100: Background and principle of the comparison and the evaluation of equivalency 1
20、Scope This document describes the procedure for evaluation in order to determine the equivalency of test methods used on a global scale in quality specifications of petroleum products, lubricants, liquid fuels and gaseous fuels for transportation purposes. The result of the assessment on each proper
21、ty is presented in a separate part of ISO/TR 19686. This document is intended to guide laboratories that use one part of ISO/TR 19686 and wish to know if they can also use other parts. 2 Normative references There are no normative references in this document. 3 T erms a nd definiti ons No terms and
22、definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/ /www.electropedia.org/ ISO Online browsing platform: available at http:/ /www.iso.org/obp 4 Comparison 4.1 Reasons for d
23、ivergence When compared test methods are originally based on the same document(s), then at the time of first publication these methods may be designated “identical”. However, if the derived methods are used in different regional, legislative and/or technical environments, they will diverge over time
24、 due to independent revision; therefore the designation “identical” will slowly move towards “equivalent” or even to “different”. 4.2 Equivalency The designations “identical”, “equivalent” or “different” can be factored into a set of important analytical parameters which do affect applicability, res
25、ults and precision as follows: a) test method scope; 1) applicability to specific product groups, 2) measurement ranges; b) interferences (matrix effects/disturbances); TECHNICAL REPORT ISO/TR 19686-100:2016(E) ISO 2016 All rights reserved 1 PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E) c) test
26、equipment/apparatus; d) procedural items (internal/external standard, calibration, sample preparation, etc.); e) precision, ILS (Interlaboratory Study) information. Any comparison of test methods should give comprehensive answers to the above mentioned issues. Several approaches to these “identity q
27、uestions” sometimes reduce the above findings to categories such as: Identical: same technical scope, procedures, results, and precision, only editorial differences due to different editorial styles; Equivalent: some differences introduced in technical aspects such as updated precision, extension of
28、 scope or range, etc.; Different: introduction of significant technical changes such as different equipment, different calibration or calculation has changed the test result or the way the test result may be or is used. 5 Questionnaire for checking similarities of test methods The questionnaire pres
29、ented in Table 1 should serve as a starting point for a more structured approach for a test method comparison. When more than one precision statement is available it is prudent to also assess the significance of any difference for r = f(x) and R = f(x) after collection of the details from the round
30、robin data of the test methods. The following main issues should be compared: A. measured property; B. instrumentation used; C. calibration; D. sampling and sample handling; E. test method procedure as such; F. precision information and the data on which it has been determined; G. any other relevant
31、 information. After the requested details have been compiled, a consensus opinion on the extent to which the compared test methods are identical/equivalent/different and which steps would be necessary to increase test similarities has been developed. Each part of ISO/TR 19686 gives a conclusion of t
32、he assessment, i.e. whether the methods under review can be considered identical or not. Table 1 Test method comparison matrix Method A Method B Comparison (Identical/equivalent/different) A Issues concerning measured properties A.1 Which properties are determined (also which units)? A.2 What exactl
33、y is the prin - ciple of measurement?2 ISO 2016 All rights reserved PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E) Method A Method B Comparison (Identical/equivalent/different) A.3 Which products can the test method be ap- plied to? A.4 What is the measure- ment range (per prop- erty)? A.5 Which
34、components can interfere with the de- termination? A.6 Are there any matrix effects to consider? B Issues concerning instrumentation B.1 List all required equip- ment including specific manufacturers if any are mentioned C Issues concerning calibration C.1 What procedure is used to prepare cali- bra
35、tion standards? If calibration standards are purchased, what re- quirements are placed on those standards? C.2 Are the standards In- ternal or external to the measurement of the tested property in the test sample? C.3 What is the cali- bration procedure? Which calculations are done to complete the c
36、alibration? D Sample handling and preparation D.1 Sample handling de- tails? D.2 Sample preparation procedure? E Procedural test meth- od details E.1 What are the test meth- od procedures? E.2 Which measurement is made? E.3 Requirements for re- porting/rounding of results?Table 1 (continued) ISO 201
37、6 All rights reserved 3 PD ISO/TR 19686-100:2016 ISO/TR 19686-100:2016(E) Method A Method B Comparison (Identical/equivalent/different) E.4 What QC sample is used to verify that the system is in statistical control? F Precision information F.1 What are the precision statements (r, R)? F.2 Dispersion
38、 of r(x), R(x) (95 % confidence bands)? F.3 How old are the preci- sion statements? F.4 What document records the inter laboratory study that supports the precision statement? F.5 How many/which sam- ple types have been in - cluded in RRT? G Any additional and helpful information G.1 Technical refer
39、ences used to develop the test method? G.2 Do other related test methods exist?Table 1 (continued) 4 ISO 2016 All rights reserved PD ISO/TR 19686-100:2016This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, in
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