EN ISO 25457:2023

Oil and gas industries including lower carbon energy - Flare details for general refinery and petrochemical service (ISO 25457:2023)

ISO 25457:2008 specifies requirements and provides guidance for the selection, design, specification, operation and maintenance of flares and related combustion and mechanical components used in pressure relieving and vapour-depressurizing systems for petroleum, petrochemical and natural gas industries.
Although ISO 25457:2008 is primarily intended for new flares and related equipment, it can also be used in the evaluation of existing flare facilities.
Further guidance and best practices are provided for the selection, specification and mechanical details for flares and on the design, operation and maintenance of flare combustion and related equipment.
ISO 25457:2008 also includes a set of data sheets, together with instructions and guidelines, for use in communicating and recording design information.

Erdöl-, petrochemische und Erdgasindustrie - Fackeln für den allgemeinen Betrieb in Raffinerien und petrochemischen Service (ISO 25457:2023)

Industries du pétrole et du gaz, y compris les énergies à faible teneur en carbone - Détails sur les torches d'usage général dans les raffineries et dans les usines pétrochimiques (ISO 25457:2023)

L'ISO 25457:2008 spécifie les exigences et fournit les lignes directrices pour le choix, la conception, les spécifications, le fonctionnement et la maintenance des torches et des composants mécaniques et de combustion associés utilisés dans les systèmes de dépressurisation et de protection contre les surpressions pour les industries du pétrole, de la pétrochimie et du gaz naturel.
Bien que l'ISO 25457:2008 soit avant tout destinée aux nouvelles torches et aux équipements associés, elle peut aussi être utilisée dans l'évaluation d'installations de torches existantes.
Des lignes directrices complémentaires et les meilleures pratiques sont donnée quant au choix, spécifications et détails d'ordre mécanique relatifs aux torches et sur la conception, le fonctionnement et la maintenance des équipements associés et de combustion des torches.
L'ISO 25457:2008 inclut également un ensemble de fiches techniques, conjointement aux instructions et lignes directrices; afin de les tiliser pour communiquer et enregistrer des informations de conception.

Naftna in plinska industrija, vključno z nizkoogljično energijo - Podrobnosti o plinskih baklah v rafinerijah in petrokemični industriji (ISO 25457:2023)

Standard ISO 25457:2008 določa zahteve in podaja smernice za izbiro, zasnovo, specifikacijo, delovanje in vzdrževanje plinskih bakel in povezanih sestavnih delov za sežiganje ter mehanskih sestavnih delov, ki se uporabljajo v sistemih za razbremenitev tlaka in zmanjševanje tlaka hlapov za petrokemično industrijo ter industrijo za predelavo nafte in zemeljskega plina.
Čeprav je standard ISO 25457:2008 namenjen predvsem novim plinskim baklam in povezani opremi, se lahko uporablja tudi pri ocenjevanju v obstoječih obratih za sežig.
Nadaljnji napotki in najboljše prakse so podani za izbiro, specifikacijo in mehanske podrobnosti plinskih bakel ter tudi za zasnovo, delovanje in vzdrževanje plinskih bakel in povezane opreme.
Standard ISO 25457:2008 prav tako vključuje sklop podatkovnih listov skupaj z navodili in napotki za uporabo pri posredovanju in beleženju informacij o zasnovi.

General Information

• Status: Published
• Publication Date: 24-Oct-2023
• ICS: 75.180.20 - Processing equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Oct-2023
• Completion Date: 25-Oct-2023
• Ref Project: SIST EN ISO 25457:2023 - Oil and gas industries including lower carbon energy - Flare details for general refinery and petrochemical service (ISO 25457:2023)

Relations

• Replaces: EN ISO 25457:2008 - Petroleum, petrochemical and natural gas industries - Flare details for general refinery and petrochemical service (ISO 25457:2008)
• Effective Date: 19-Jan-2023
• Consolidated By: ISO 25457:2023 - Oil and gas industries including lower carbon energy — Flare details for general refinery and petrochemical service
• Effective Date: 12-Feb-2026

Overview

EN ISO 25457:2023 sets internationally recognized requirements and provides essential guidance for the selection, design, specification, operation, and maintenance of flares and related combustion and mechanical components used in pressure-relieving and vapor-depressurizing systems. This standard is key for the oil and gas industries, including lower carbon energy sectors, and is especially relevant for the refinery and petrochemical industries. Developed by CEN and aligned with ISO's global framework, the standard ensures safe and reliable flare operation in both new and existing installations, with a primary focus on onshore facilities but includes guidance for offshore applications.

Key Topics

• Flare System Design and Selection
  The standard outlines industry best practices for designing and specifying combustion equipment associated with pressure relief and vapor-depressurizing systems. It emphasizes the importance of selecting appropriate flare technologies to meet required performance, safety, and environmental standards.

• Operational and Maintenance Guidelines
  Guidance is provided on the operation and maintenance of flare systems to ensure safe, efficient, and long-term functioning. The document discusses important considerations such as regular inspection, maintenance scheduling, and system troubleshooting.

• Ignition Systems
  EN ISO 25457:2023 supplements API 537 and addresses modern ignition systems such as ballistic and pyrotechnical ignition systems. It details requirements for projectile-based flare ignition, including safety, purge procedures, projectile handling, and spent projectile containment.

• Volumetric Flow and Process Data
  Specific recommendations are included for the calculation and documentation of volumetric flow rates and other design data critical for flare system configuration and compliance.

• Evaluation of Existing Facilities
  While the standard is developed for new installations, it also provides a framework for assessing and upgrading existing flare systems to improve safety and performance.

Applications

The practical value of EN ISO 25457:2023 is broad and supports various activities within the oil and gas, petrochemical, and increasingly, lower carbon energy industries. Typical applications include:

• Design and Construction of Refineries and Petrochemical Plants
  Ensures that newly constructed facilities conform to the highest international standards for flare system safety and performance.
• Upgrading and Auditing Existing Flare Installations
  Provides benchmarks for evaluating current equipment and implementing upgrades for compliance with evolving industry practices and regulations.
• Equipment Procurement and Specification
  Helps engineers, project managers, and procurement professionals select and specify compliant combustion, ignition, and mechanical components.
• Safety and Regulatory Compliance
  Supports adherence to safety codes, local regulations, and environmental targets by providing clear, harmonized guidance.
• Communication and Record-Keeping
  The inclusion of datasheets and documentation guidelines aids in effective communication between stakeholders and ensures traceability of design decisions.

Related Standards

To deliver maximum value, compliance with EN ISO 25457:2023 should be paired with familiarity with key related standards:

• API Std 537: Flare Details for Petroleum, Petrochemical, and Natural Gas Industries, which EN ISO 25457:2023 supplements.
• EN ISO 25457:2008: The previous edition, now superseded, for reference to legacy requirements.
• Standards on Pressure Relief Equipment: Such as ISO 4126, for comprehensive safety system design.
• Process Equipment Standards: Notably ICS 75.180.20 series for processing equipment.

Implementing EN ISO 25457:2023 demonstrates a commitment to industry-leading flare safety and performance, supporting both operational excellence and environmental goals for energy operators and engineering firms worldwide.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2023
Naftna in plinska industrija, vključno z nizkoogljično energijo - Podrobnosti o
plinskih baklah v rafinerijah in petrokemični industriji (ISO 25457:2023)
Oil and gas industries including lower carbon energy - Flare details for general refinery
and petrochemical service (ISO 25457:2023)
Erdöl-, petrochemische und Erdgasindustrie - Fackeln für den allgemeinen Betrieb in
Raffinerien und petrochemischen Service (ISO 25457:2023)
Industries du pétrole et du gaz, y compris les énergies à faible teneur en carbone -
Détails sur les torches d'usage général dans les raffineries et dans les usines
pétrochimiques (ISO 25457:2023)
Ta slovenski standard je istoveten z: EN ISO 25457:2023
ICS:
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 25457
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2023
EUROPÄISCHE NORM
ICS 75.180.20 Supersedes EN ISO 25457:2008
English Version
Oil and gas industries including lower carbon energy -
Flare details for general refinery and petrochemical
service (ISO 25457:2023)
Industries du pétrole et du gaz, y compris les énergies Erdöl-, petrochemische und Erdgasindustrie - Fackeln
à faible teneur en carbone - Détails sur les torches für den allgemeinen Betrieb in Raffinerien und
d'usage général dans les raffineries et dans les usines petrochemischen Service (ISO 25457:2023)
pétrochimiques (ISO 25457:2023)
This European Standard was approved by CEN on 12 October 2023.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 25457:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 25457:2023) has been prepared by Technical Committee ISO/TC 67 "Oil and
gas industries including lower carbon energy" in collaboration with Technical Committee CEN/TC 12
“Oil and gas industries including lower carbon energy” the secretariat of which is held by NEN.
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 April 2024, and conflicting national standards shall be
withdrawn at the latest by April 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 25457:2008.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 25457:2023 has been approved by CEN as EN ISO 25457:2023 without any modification.

INTERNATIONAL ISO
STANDARD 25457
Second edition
2023-10
Oil and gas industries including lower
carbon energy — Flare details for
general refinery and petrochemical
service
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Détails sur les torches d'usage général dans les
raffineries et dans les usines pétrochimiques
Reference number
ISO 25457:2023(E)
ISO 25457:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 25457:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
rd
4 Supplements to API 537, 3 edition (2017) . 1
4.1 General requirements . 1
4.2 Limitations for design procedures . 2
4.3 Volumetric flow rate .
...