EN ISO 4126-5:2013

Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) (ISO 4126-5:2013)

ISO 4126-5:2013 specifies the requirements for controlled safety pressure relief systems (CSPRS) irrespective of the fluid for which they are designed.
It is applicable for main valves having a flow diameter of 4 mm and above which are for use at pressures of 0,1 bar gauge and above. No limitation is placed on temperature.
ISO 4126-5:2013 is a product standard and is not applicable to applications.

Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 5: Gesteuerte Sicherheitsventile (CSPRS) (ISO 4126-5:2013)

Dieser Teil der ISO 4126 legt die Anforderungen an gesteuerte Sicherheitsventile (CSPRS) fest, unabhängig von dem Medium, für das sie vorgesehen sind.
Die Norm gilt für Hauptventile mit einem engsten Strömungsdurchmesser von mindestens 4 mm und für Drücke von 0,1 bar und höher. Hinsichtlich der Temperatur bestehen keine Einschränkungen.
Die vorliegende Norm ist eine Produktnorm und behandelt keine Anwendungsfälle.

Dispositifs de sécurité pour protection contre les pressions excessives - Partie 5: Dispositifs de sécurité asservis (CSPRS)) (ISO 4126-5:2013)

L'ISO 4126-5:2013 spécifie les exigences des dispositifs de sécurité piloté contre les surpressions (CSPRS), quel que soit le fluide pour lequel ils sont conçus.
Elle est applicable aux appareils de robinetterie principaux ayant un diamètre d'écoulement de 4 mm au moins qui sont utilisés à des pressions de 0,1 bar manométrique et au-dessus. Aucune limitation en température n'est spécifiée.
L'ISO 4126-5:2013 est une norme de produit et elle n'est pas applicable à la mise en ?uvre des CSPRS.

Naprave za varovanje pred visokim tlakom - 5. del: Krmiljeni varnostni sistemi za sproščanje tlaka (CSPRS) (ISO 4126-5:2013)

Ta del standarda ISO 4126 določa zahteve za nadzorovane varnostne sisteme za razbremenitev tlaka (CSPRS) ne glede na tekočino, za katero so oblikovani. Velja za glavne ventile s premerom pretoka 4 mm in več, ki se uporabljajo pri tlakih 0,1 bara in več. Temperatura ni omejena. To je standard izdelka in ne velja za uporabo.

General Information

• Status: Published
• Publication Date: 16-Jul-2013
• Withdrawal Date: 30-Jan-2014
• ICS: 13.240 - Protection against excessive pressure
• Technical Committee: CEN/TC 69 - Industrial valves
• Drafting Committee: CEN/TC 69/WG 10 - Safety devices against excessive pressure
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 17-Jul-2013
• Completion Date: 17-Jul-2013
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN ISO 4126-5:2013 - Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) (ISO 4126-5:2013)

Relations

• Replaces: EN ISO 4126-5:2004/AC:2008 - Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) (ISO 4126-5:2004/Cor 1:2006/Cor 2:2007)
• Effective Date: 24-Jul-2013
• Replaces: EN ISO 4126-5:2004 - Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) (ISO 4126-5:2004)
• Effective Date: 22-Dec-2008
• Amended By: EN ISO 4126-5:2013/A1:2016 - Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) - Amendment 1 (ISO 4126-5:2013/Amd 1:2016)
• Effective Date: 25-Nov-2015

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2013
1DGRPHãþD
SIST EN ISO 4126-5:2004
SIST EN ISO 4126-5:2004/AC:2009
1DSUDYH]DYDURYDQMHSUHGYLVRNLPWODNRPGHO.UPLOMHQLYDUQRVWQLVLVWHPL]D
VSURãþDQMHWODND&6356,62
Safety devices for protection against excessive pressure - Part 5: Controlled safety
pressure relief systems (CSPRS) (ISO 4126-5:2013)
Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 5: Gesteuerte
Sicherheitsventile (CSPRS) (ISO 4126-5:2013)
Dispositifs de sécurité pour protection contre les pressions excessives - Partie 5:
Dispositifs de sûreté à décharge contrôlés contre les surpressions (DSDCS) (ISO 4126-
5:2013)
Ta slovenski standard je istoveten z: EN ISO 4126-5:2013
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 4126-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2013
ICS 13.240 Supersedes EN ISO 4126-5:2004
English Version
Safety devices for protection against excessive pressure - Part
5: Controlled safety pressure relief systems (CSPRS) (ISO
4126-5:2013)
Dispositifs de sécurité pour protection contre les pressions Sicherheitseinrichtungen gegen unzulässigen Überdruck -
excessives - Partie 5: Dispositifs de sécurité asservis Teil 5: Gesteuerte Sicherheitsventile (CSPRS) (ISO 4126-
(CSPRS)) (ISO 4126-5:2013) 5:2013)
This European Standard was approved by CEN on 28 December 2012.

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

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4126-5:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC (PED) .4

Foreword
This document (EN ISO 4126-5:2013) has been prepared by Technical Committee ISO/TC 185 "Safety
devices for protection against excessive pressure" in collaboration with the 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 January 2014, and conflicting national standards shall be withdrawn at
the latest by January 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 4126-5:2004.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
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 4126-5:2013 has been approved by CEN as EN ISO 4126-5:2013 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC (PED)
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 97/23/EC (PED).
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a
presumption of conformity with the corresponding Essential Requirements of that Directive and associated
EFTA regulations.
Table ZA.1 — Correspondence between this International Standard and Directive 97/23/EC (PED)
Sub-clauses of this International Essential Requirements of Directive 97/23/EC (PED)
Standard
Essential Requirements Annex I of PED
5,6,7,8,9 Safety accessories 2.11.1
5.1.6 Safety of operation 2.3
5.1.7 Drain and venting 2.5
6.3 Proof test 3.2.2
10 Marking and labelling 3.3
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the
scope of this standard.
INTERNATIONAL ISO
STANDARD 4126-5
Second edition
2013-07-15
Safety devices for protection against
excessive pressure —
Part 5:
Controlled safety pressure relief
systems (CSPRS)
Dispositifs de sécurité pour protection contre les pressions excessives —
Partie 5: Dispositifs de sécurité asservis (CSPRS)
Reference number
ISO 4126-5:2013(E)
©
ISO 2013
ISO 4126-5:2013(E)
© ISO 2013
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 2013 – All rights reserved

ISO 4126-5:2013(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 7
5 Design . 7
5.1 General . 7
5.2 Valve end connections . 9
5.3 Minimum requirements for springs .10
5.4 Materials .10
6 Production testing .10
6.1 Purpose .10
6.2 General .10
6.3 Hydrostatic testing .11
6.4 Pneumatic testing .11
6.5 Adjustment of set or cold differential test pressure .12
6.6 Seat leakage test.12
6.7 Pressure seals .12
7 Type testing.12
7.1 General .12
7.2 Tests to determine operating characteristics .14
7.3 Tests to determine flow characteristics.15
7.4 Determination of the coefficient of discharge .17
7.5 Certification of coefficient of discharge .17
7.6 Certification of CSPRS .17
8 Determination of CSPRS performance .17
9 Sizing of CSPRS .17
10 Marking and sealing .18
10.1 Marking .18
10.2 Sealing of a CSPRS .19
Bibliography .20
ISO 4126-5:2013(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
commi
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