International ISO Standard IS014617-1 Graphical symbols for diagrams Third edition 2025-03 Part 1: General rules Symboles graphiques pour schémas - Partie 1: Informations générales et index Reference number ISO 14617-1:2025(en) @ ISO 2025 IS0 14617-1:2025(en) COPYRIGHT PROTECTED DOCUMENT @ IS0 2025 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: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland @ IS0 2025 - All rights reserved ii IS0 14617-1:2025(en) Contents Page iv Foreword Introduction Scope 1 1 2 Normative references 3 Terms and definitions 1 4 Graphical symbols 2 4.1 2 General 4.2 Graphical symbols of same shape but different meaning 2 4.3 Dimensions and lines. 4.4 Modification of proportions 4.5 Orientation of graphical symbols 4.6 Different forms of graphical symbols 3 4.7 Creation of new symbol examples. 4.8 Letter codes, abbreviations, etc. 4.8.1 Overview 4.8.2 Chemical formulae. 4.8.3 Unit designations 5 Representation of graphical symbols 4 5.1 Structuring of representation. .4 5.2 Representation of graphical symbols in IS0 14617-2 5 Annex A (informative) Registration numbers for graphical symbols 6 Annex B (informative) Creation of new symbols. 7 Annex C (informative) Letter codes for process variables, control functions and modifying 8 purposes. Bibliography. 10 @ IS0 2025 - All rights reserved iii IS0 14617-1:2025(en) 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/lEC Directives, Part 1. In particular, the different approval criteria needed for the different types of IsO document 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). Iso draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). IsO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, iso had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights. Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation of 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 www.iso.org/iso/foreword.html. This document was prepared by Technical Co