EN ISO 4126-6:2014

SLOVENSKI STANDARD
01-september-2014
1DGRPHãþD
SIST EN ISO 4126-6:2004
SIST EN ISO 4126-6:2004/AC:2007
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UD]SRþQLKPHPEUDQ,62
Safety devices for protection against excessive pressure - Part 6: Application, selection
and installation of bursting disc safety devices (ISO 4126-6:2014)
Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 6:
Berstscheibeneinrichtungen; Anwendung, Auswahl und Einbau (ISO 4126-6:2014)
Dispositifs de sécurité pour protection contre les pressions excessives - Partie 6:
Application, sélection et installation des dispositifs de sûreté à disque de rupture (ISO
4126-6:2014)
Ta slovenski standard je istoveten z: EN ISO 4126-6:2014
ICS:
13.240 Varstvo pred previsokim Protection against excessive
tlakom pressure
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 4126-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 13.240 Supersedes EN ISO 4126-6:2003
English Version
Safety devices for protection against excessive pressure - Part
6: Application, selection and installation of bursting disc safety
devices (ISO 4126-6:2014)
Dispositifs de sécurité pour protection contre les pressions Sicherheitseinrichtungen gegen unzulässigen Überdruck -
excessives - Partie 6: Application, sélection et installation Teil 6: Berstscheibeneinrichtungen; Anwendung, Auswahl
des dispositifs de sûreté à disque de rupture (ISO 4126- und Einbau (ISO 4126-6:2014)
6:2014)
This European Standard was approved by CEN on 22 May 2014.

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 CEN-CENELEC 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 CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4126-6:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 4126-6:2014) has been prepared by Technical Committee ISO/TC 185 “Safety
devices for protection against excessive pressure” in collaboration with Technical Committee CEN/TC 69
“Industrial valves” the secretariat of which is held by AFNOR.
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 December 2014, and conflicting national standards shall be withdrawn
at the latest by December 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4126-6:2003.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4126-6:2014 has been approved by CEN as EN ISO 4126-6:2014 without any modification.
INTERNATIONAL ISO
STANDARD 4126-6
Second edition
2014-06-15
Safety devices for protection against
excessive pressure —
Part 6:
Application, selection and installation
of bursting disc safety devices
Dispositifs de sécurité pour protection contre les pressions
excessives —
Partie 6: Application, sélection et installation des dispositifs de sûreté
à disque de rupture
Reference number
ISO 4126-6:2014(E)
©
ISO 2014
ISO 4126-6:2014(E)
© ISO 2014
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.
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 4126-6:2014(E)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 5
5 Application . 6
6 Selection . 8
6.1 Selection of bursting disc safety devices . 8
6.2 Selection of the performance tolerance.10
7 Installation .12
7.1 General .12
7.2 Location of bursting disc safety devices .12
7.3 Installation of bursting disc safety devices .12
Annex A (informative) Information to be supplied by the purchaser .14
Annex B (informative) Guidelines for determining the replacement period of a bursting disc .16
Annex C (informative) Pressure relief system discharge capacity .18
Annex D (informative) Flow testing of bursting disc safety devices .21
Annex E (informative) Type testing of non-reclosing bursting disc safety devices .35
Annex F (informative) Performance characteristics of bursting disc safety devices .37
Bibliography .39
ISO 4126-6:2014(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. 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. 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 specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 185, Safety devices for protection against excessive
pressure.
This second edition cancels and replaces the first edition (ISO 4126-6:2003), which has been technically
revised.
The main technical modifications are:
a) Revision to Annex C to refer to Part 7 for capacity calculations;
b) Annex D was deleted as this information is found in Part 7;
c) Annex E was revised to include methodology for establishing flow resistance values for bursting
discs opened in incompressible fluid;
d) Annex F was added to include existing and additional guidelines for type testing;
e) Annex G was added to provide a place for informative information relative to bursting disc tolerances
and operating parameters.
ISO 4126 consists of the following parts, under the general title Safety devices for protection against
excessive pressure:
— Part 1: Safety valves
— Part 2: Bursting disc safety devices
— Part 3: Safety valves and bursting disc safety devices in combination
— Part 4: Pilot operated safety valves
— Part 5: Controlled safety pressure relief systems (CSPRS)
— Part 6: Application, selection and installation of bursting disc safety devices
iv © ISO 2014 – All rights reserved

ISO 4126-6:2014(E)
— Part 7: Common data
— Part 9: Application and installation of safety devices excluding stand-alone bursting disc safety devices
— Part 10: Sizing of safety valves for gas/liquid two-phase flow
1)
— Part 11: Performance testing
Part 7 contains data, which is common to more than one of the parts of ISO 4126 to avoid unnecessary
repetition.
1) In development.
ISO 4126-6:2014(E)
Introduction
Safety devices for the protection of pressure equipment against excessive pressure include pressure relief
devices such as safety valves and bursting disc safety devices which, dependent upon the application,
may be used either as the sole pressure relieving devices or in conjunction with each other.
Operating problems frequently arise due to the use of pressure relieving devices not having been
properly selected for the intended service or properly selected but whose performance is adversely
affected by improper handling, wrong installation or lack of maintenance, any of which may affect the
safety of the pressure equipment being pr
...