EN ISO 4126-7:2013/A1:2016

Safety devices for protection against excessive pressure - Part 7: Common data - Amendment 1 (ISO 4126-7:2013/Amd 1:2016)

Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 7: Allgemeine Daten - Änderung 1 (ISO 4126-7:2013/Amd 1:2016)

Dispositifs de sécurité pour protection contre les pressions excessives - Partie 7: Données communes - Amendement 1 (ISO 4126-7:2013/Amd 1:2016)

Naprave za varovanje pred visokim tlakom - 7. del: Splošni podatki - Dopolnilo A1 (ISO 4126-7:2013/Amd 1:2016)

General Information

• Status: Published
• Publication Date: 28-Jun-2016
• Withdrawal Date: 30-Dec-2016
• 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: 29-Jun-2016
• Completion Date: 29-Jun-2016
• 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 4126-7:2013/A1:2016 - Safety devices for protection against excessive pressure - Part 7: Common data (ISO 4126-7:2013/Amd 1:2016)

Relations

• Amends: EN ISO 4126-7:2013 - Safety devices for protection against excessive pressure - Part 7: Common data (ISO 4126-7:2013)
• Effective Date: 25-Nov-2015

Overview

EN ISO 4126-7:2013/A1:2016 is an important amendment to the international standard ISO 4126-7:2013, focusing on safety devices for protection against excessive pressure. This part 7 of the ISO 4126 series addresses the incorporation and use of common data relevant to pressure protection equipment. Published and endorsed by the European Committee for Standardization (CEN) in 2016, this amendment updates key technical data and calculation methods to enhance reliability and safety in pressure safety device applications.

This standard is pivotal for manufacturers, engineers, and safety professionals involved in pressure relief systems across industrial sectors. It ensures that devices like safety valves and bursting discs operate effectively to prevent overpressure scenarios that could lead to equipment failure or hazardous incidents.

Key Topics

• Common Data for Safety Devices
  The amendment refines general data used in designing and testing safety devices against excessive pressure, standardizing parameters for accurate and consistent device performance.

• Updated Calculations and Formulas
  The document revises key calculation formulas, including flow area and capacity calculations for safety valves handling gaseous media under critical flow conditions. For example, it updates the coefficient calculation formula and provides a detailed example for nitrogen gas.

• Compressibility Factor Estimation
  Introduction of an updated estimating chart (Figure 1) for the compressibility factor (Z), which is critical for precise flow capacity calculations of gases in safety devices.

• Technical Committee Collaboration
  Prepared by ISO/TC 185 in cooperation with CEN/TC 69, the amendment reflects harmonized inputs from experts in safety devices and industrial valves, ensuring widespread applicability in Europe and internationally.

• Patent Rights & Compliance
  Attention is given to potential patent rights involved in standard elements. The amendment supports compliance with EU directives, making it essential for national standard adoption across CEN member countries.

Applications

EN ISO 4126-7:2013/A1:2016 is extensively applied in:

• Industrial Valves and Safety Relief Systems
  Designing and certifying safety valves, bursting discs, and other protective devices used in process industries such as petrochemical, chemical manufacturing, and power generation.

• Pressure Vessel Safety
  Ensuring protective devices accurately respond to pressure surges, maintaining vessel integrity by adhering to standardized formulas and data.

• Equipment Certification and Testing
  Providing a technical basis for manufacturers and testing bodies to validate performance parameters and ensure conformity with European and international safety standards.

• Engineering Design and Risk Assessment
  Equipping engineers with reliable calculation methods to size and select pressure safety devices, critical for system safety and compliance with legal requirements.

Related Standards

This amendment complements the ISO 4126 series covering various aspects of pressure safety devices:

• ISO 4126-1 – Safety devices for protection against excessive pressure - Part 1: Safety valves
• ISO 4126-2 – Safety devices for protection against excessive pressure - Part 2: Bursting discs
• ISO 4126-3 – Safety devices for protection against excessive pressure - Part 3: Qualification testing of bursting disc safety devices
• ISO 4126-4 – Safety devices for protection against excessive pressure - Part 4: Characteristics and application of pilot-operated safety valves
• ISO 4126-8 – Safety devices for protection against excessive pressure - Part 8: Safety valves with spring-loaded or contained pilot valves

Together, these standards form a comprehensive framework guiding the design, selection, testing, and application of pressure safety devices, fostering industrial safety and operational efficiency globally.

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Keywords: Safety devices, excessive pressure protection, ISO 4126-7 amendment, safety valve calculations, compressibility factor, pressure relief systems, industrial valves, pressure safety standards, CEN, EU directives compliance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2016
Naprave za varovanje pred visokim tlakom - 7. del: Splošni podatki - Dopolnilo A1
(ISO 4126-7:2013/Amd 1:2016)
Safety devices for protection against excessive pressure - Part 7: Common data (ISO
4126-7:2013/Amd 1:2016)
Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 7: Allgemeine Daten (ISO
4126-7:2013/Amd 1:2016)
Dispositifs de sécurité pour protection contre les pressions excessives - Partie 7:
Données communes (ISO 4126-7:2013/Amd 1:2016)
Ta slovenski standard je istoveten z: EN ISO 4126-7:2013/A1:2016
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.

EN ISO 4126-7:2013/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 13.240
English Version
Safety devices for protection against excessive pressure -
Part 7: Common data - Amendment 1 (ISO 4126-
7:2013/Amd 1:2016)
Dispositifs de sécurité pour protection contre les Sicherheitseinrichtungen gegen unzulässigen
pressions excessives - Partie 7: Données communes - Überdruck - Teil 7: Allgemeine Daten - Änderung 1
Amendement 1 (ISO 4126-7:2013/Amd 1:2016) (ISO 4126-7:2013/Amd 1:2016)
This amendment A1 modifies the European Standard EN ISO 4126-7:2013; it was approved by CEN on 19 May 2016.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant 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 amendment 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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4126-7:2013/A1:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 4126-7:2013/A1:2016) 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 Amendment to the European Standard EN ISO 4126-7:2013 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by December 2016,
and conflicting national standards shall be withdrawn at the latest by December 2016.
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 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(s).
For relationship with EU Directive, see informative Annex ZA, which is an integral part of
EN ISO 4126-7:2013.
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 4126-7:2013/Amd 1:2016 has been approved by CEN as EN ISO 4126-7:2013/A1:2016
without any modification.
INTERNATIONAL ISO
STANDARD 4126-7
Second edition
2013-07-15
AMENDMENT 1
2016-06-01
Safety devices for protection against
excessive pressure —
Part 7:
Common da
...