ISO 6553:2016
(Main)Automatic steam traps - Marking
Automatic steam traps - Marking
ISO 6553:2016 specifies mandatory and optional markings for automatic steam traps.
Purgeurs automatiques de vapeurs d'eau — Marquage
ISO 6553:2016 spécifie les marquages obligatoires et facultatifs à porter sur les purgeurs automatiques de vapeur d'eau.
General Information
- Status
- Published
- Publication Date
- 07-Dec-2016
- Technical Committee
- ISO/TC 153 - Valves
- Drafting Committee
- ISO/TC 153 - Valves
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 24-Mar-2022
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 10-Aug-2013
Overview
ISO 6553:2016 - Automatic steam traps - Marking defines the mandatory and optional marking requirements for automatic steam traps. This second edition (2016) replaces ISO 6553:1980 and updates marking requirements to align with ISO 5209 and EN 19. The standard sets basic rules for how information must be displayed on trap bodies or plates to ensure traceability, safe operation, and correct installation.
Key Topics and Requirements
- Scope: Specifies mandatory and optional markings for automatic steam traps; intended to be used alongside any specific contractual requirements.
- General requirements:
- Markings shall be applied on the body or on plates integral with or securely fixed to the body.
- Markings must not be hidden by the fixing elements of the steam trap.
- Mandatory marking (each automatic steam trap shall show):
- Manufacturer’s name and/or trademark
- Maximum allowable pressure (bar or MPa)
- Maximum allowable temperature (°C)
- Flow direction indication (arrow)
- Shell material designation
- Nominal size (DN or NPS)
- Nominal pressure (PN or Class designation)
- Note: For traps without a defined PN or Class, maximum allowable pressure and temperature are mandatory.
- For DN/NPS sizes with PN/Class designation, letters “DN” or “NPS” may be omitted if PN/Class follows immediately (e.g., “50 PN 25” or “2 CL 300”).
- For traps ≤ DN 50 (NPS 2) the shell material marking can be omitted.
- Optional markings:
- Maximum operating pressure or maximum differential pressure (as relevant)
- Maximum test pressure (bar or MPa)
- Additional markings:
- Manufacturers may repeat required markings in more than one place (body and plate).
- Other information (e.g., catalogue numbers) may be added provided it does not cause confusion with mandatory markings.
Applications and Who Uses ISO 6553:2016
ISO 6553:2016 is used by:
- Steam trap manufacturers for product labeling and compliance.
- Plant engineers and maintenance teams to verify correct trap selection, installation, and safe operating limits.
- Procurement and inspection to confirm traceability, material and pressure/temperature ratings.
- Compliance officers and certification bodies checking conformity with industry marking practices. Practical benefits include improved safety, easier maintenance, reduced installation errors, and clearer product identification in steam systems and industrial plants.
Related Standards
- ISO 5209 - General purpose industrial valves - Marking
- ISO 6552 - Automatic steam traps - Definition of technical terms
- EN 19 - Industrial valves - Marking of metallic valves
Keywords: ISO 6553:2016, automatic steam traps, steam trap marking, marking requirements, manufacturer marking, maximum allowable pressure, nominal size, PN, DN.
Frequently Asked Questions
ISO 6553:2016 is a standard published by the International Organization for Standardization (ISO). Its full title is "Automatic steam traps - Marking". This standard covers: ISO 6553:2016 specifies mandatory and optional markings for automatic steam traps.
ISO 6553:2016 specifies mandatory and optional markings for automatic steam traps.
ISO 6553:2016 is classified under the following ICS (International Classification for Standards) categories: 23.060.01 - Valves in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 6553:2016 has the following relationships with other standards: It is inter standard links to ISO 6553:1980. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 6553:2016 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6553
Second edition
2016-12-15
Automatic steam traps — Marking
Purgeurs automatiques de vapeurs d’eau — Marquage
Reference number
©
ISO 2016
© 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.
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
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 1
5 Mandatory marking. 1
6 Optional markings . 2
7 Additional markings . 2
Bibliography . 3
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
...
NORME ISO
INTERNATIONALE 6553
Deuxième édition
2016-12-15
Purgeurs automatiques de vapeurs
d’eau — Marquage
Automatic steam traps — Marking
Numéro de référence
©
ISO 2016
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016, Publié en Suisse
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur
l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à
l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
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
copyright@iso.org
www.iso.org
ii © ISO 2016 – Tous droits réservés
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Exigences générales . 1
5 Marquage obligatoire . 1
6 Marquages facultatifs . 2
7 Marquages supplémentaires . 2
Bibliographie . 3
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www.
iso.org/directives).
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de
brevets reçues par l’ISO (voir www.iso.org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’inte
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