ISO 4126-1:2013/Amd 1:2016
(Amendment)Safety devices for protection against excessive pressure - Part 1: Safety valves - Amendment 1
Safety devices for protection against excessive pressure - Part 1: Safety valves - Amendment 1
Dispositifs de sécurité pour protection contre les pressions excessives — Partie 1: Soupapes de sûreté — Amendement 1
General Information
- Status
- Published
- Publication Date
- 02-Jun-2016
- Technical Committee
- ISO/TC 185 - Safety devices for protection against excessive pressure
- Drafting Committee
- ISO/TC 185 - Safety devices for protection against excessive pressure
- Current Stage
- 6060 - International Standard published
- Start Date
- 03-Jun-2016
- Due Date
- 30-Oct-2018
- Completion Date
- 30-Oct-2018
Relations
- Consolidates
ISO 19012-3:2015 - Microscopes — Designation of microscope objectives — Part 3: Spectral transmittance - Effective Date
- 06-Jun-2022
- Amends
ISO 4126-1:2013 - Safety devices for protection against excessive pressure - Part 1: Safety valves - Effective Date
- 12-Oct-2020
Overview
ISO 4126-1:2013/Amd 1:2016 is an important amendment to the international standard covering safety devices designed to protect systems from excessive pressure through the use of safety valves. Issued by the International Organization for Standardization (ISO), this amendment refines requirements for safety valves in industrial applications, ensuring enhanced reliability and safety. It focuses on operating pressures, testing methodologies, and performance tolerances relevant to safety valves used in gas, steam, and liquid services.
Key Topics
Set Pressure Requirements: The amendment specifies that safety valves shall be tested at both minimum and maximum set pressures for which the spring mechanism is designed. This ensures valves function correctly across their entire operational range.
Testing Media:
- Valves for air or other gases must be tested using air, equivalent gases with known properties, or superheated steam (with at least 10 °C superheat).
- Valves used for steam services can be tested with steam, air, or gases with known characteristics.
- Valves for liquid services should be tested using water or liquids of known characteristics.
Tolerance Limits on Operating Characteristics:
- Set Pressure: ±3% of the set pressure or ±0.1 bar, whichever is greater.
- Lift at Overpressure: Must meet or exceed manufacturer values.
- Overpressure: Limited to the manufacturer-stated value but not exceeding 10% of set pressure or 0.1 bar.
- Blowdown:
- For compressible fluids, blowdown is limited between 2.0% and a maximum of 15% or 0.3 bar.
- For incompressible fluids, blowdown ranges between 2.5% and a maximum of 20% or 0.6 bar.
Special Valve Types:
- Restricted lift valves share the same tolerance limits as unrestricted ones.
- Valves with proportional opening characteristics require stability verification across valve lifts, with a curve established for valve lift versus overpressure.
Applications
ISO 4126-1:2013/Amd 1:2016 plays a critical role in the selection, testing, and certification of safety valves used in a wide range of industries such as:
- Petrochemical and Chemical Processing: Ensuring safety valves reliably protect vessels and pipelines handling gases and liquids under pressure.
- Power Generation: Application to steam-operated turbines and boilers, guaranteeing valves meet strict performance and safety requirements.
- Oil and Gas Industry: Protection of compressors, storage tanks, and pipelines from overpressure incidents.
- Water Treatment and Distribution: Safeguarding pumps and pipelines used in liquid services against excessive pressure failures.
- Manufacturing and Heavy Industry: Where pressure vessel safety is paramount to maintain operational integrity and worker safety.
By adhering to this amendment, manufacturers and users ensure that safety valves are tested under accurate and reproducible conditions, reducing risks of failure and improving plant safety compliance.
Related Standards
For comprehensive pressure protection and safety management, ISO 4126-1:2013/Amd 1:2016 works in conjunction with related standards such as:
- ISO 4126-2: Safety devices for protection against excessive pressure - Part 2: Bursting disc safety devices.
- ISO 4126-3: Safety devices for protection against excessive pressure - Part 3: Safety valves for gas burners and gas appliances.
- ISO/IEC Directives Part 1 and Part 2: Governing procedures for drafting and maintaining ISO standards.
- IEC Standards: Complementary electrotechnical standards relevant when safety valves integrate with control systems.
Implementing ISO 4126-1:2013/Amd 1:2016 alongside related standards promotes a holistic approach to pressure safety device design, testing, and operation.
Keywords: ISO 4126-1:2013 amendment, safety valves, excessive pressure protection, pressure safety devices, valve testing, industrial safety standards, valve set pressure, overpressure tolerances, blowdown limits, proportional opening valves, ISO pressure device standards, safety valve performance.
ISO 4126-1:2013/Amd 1:2016 - Safety devices for protection against excessive pressure — Part 1: Safety valves — Amendment 1 Released:6/3/2016
ISO 4126-1:2013/Amd 1:2016 - Dispositifs de sécurité pour protection contre les pressions excessives — Partie 1: Soupapes de sûreté — Amendement 1 Released:6/3/2016
Frequently Asked Questions
ISO 4126-1:2013/Amd 1:2016 is a standard published by the International Organization for Standardization (ISO). Its full title is "Safety devices for protection against excessive pressure - Part 1: Safety valves - Amendment 1". This standard covers: Safety devices for protection against excessive pressure - Part 1: Safety valves - Amendment 1
Safety devices for protection against excessive pressure - Part 1: Safety valves - Amendment 1
ISO 4126-1:2013/Amd 1:2016 is classified under the following ICS (International Classification for Standards) categories: 13.240 - Protection against excessive pressure. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 4126-1:2013/Amd 1:2016 has the following relationships with other standards: It is inter standard links to ISO 19012-3:2015, ISO 4126-1:2013. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 4126-1:2013/Amd 1:2016 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4126-1
Third edition
2013-07-15
AMENDMENT 1
2016-06-01
Safety devices for protection against
excessive pressure —
Part 1:
Safety valves
AMENDMENT 1
Dispositifs de sécurité pour protection contre les pressions
excessives —
Partie 1: Soupapes de sûreté
AMENDEMENT 1
Reference number
ISO 4126-1:2013/Amd.1:2016(E)
©
ISO 2016
ISO 4126-1:2013/Amd.1:2016(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.
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
ISO 4126-1:2013/Amd.1:2016(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 en
...
NORME ISO
INTERNATIONALE 4126-1
Troisième édition
2013-07-15
AMENDEMENT 1
2016-06-01
Dispositifs de sécurité pour protection
contre les pressions excessives —
Partie 1:
Soupapes de sûreté
AMENDEMENT 1
Safety devices for protection against excessive pressure —
Part 1: Safety valves
AMENDMENT 1
Numéro de référence
ISO 4126-1:2013/Amd.1:2016(F)
©
ISO 2016
ISO 4126-1:2013/Amd.1:2016(F)
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
ISO 4126-1:2013/Amd.1:2016(F)
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’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la signification des termes et expressions spécifiques de l’ISO liés à
l’évaluation de la conformité, ou pour tou
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