National foreword

This British Standard is the UK implementation of EN ISO 24817:2026. It is identical to ISO 24817:2026. It supersedes BS EN ISO 24817:2017, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee PSE/17/-/6, Processing equipment and systems for petroleum and natural gas industries.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2026.

This European Standard was approved by CEN on 17 August 2026.

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, Czechia, 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 foreword

This document (EN ISO 24817:2026) 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 March 2027, and conflicting national standards shall be withdrawn at the latest by March 2027.

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 24817:2017.

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 24817:2026 has been approved by CEN as EN ISO 24817:2026 without any modification.

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 document 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).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 67, Oil and gas industries including lower carbon energy, Subcommittee SC 6, Process equipment, piping, systems, and related safety, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 12, Oil and gas industries including lower carbon energy, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 24817:2017), which has been technically revised.

The main changes are as follows:

Clause 7 has been split into three separate Clauses: 7 (Qualification), 8 (Repair feasibility assessment) and 9 (Design methodology) to enable clear referencing;
in Clause 9, the individual design stages have been reorganised so that they are now presented in the sequence they are used to make it easier to follow and review;
where multiple options for design are presented, clarification has been added to guide on when each should be selected;
design lifetimes of up to 50 years can now be considered and the guidance on managing them in service has been reinforced;
requirements for considering temperature effects have been clarified;
assessment of cyclic loading has been updated to maintain equivalence with guidance in ISO 14692;
Poisson’s effects have been reviewed and updated;
Type A design formulae have been re-arranged so that they can be calculated rather than some requiring iteration;
considerations of installing repairs on live lines (under pressure) have been revised;
guidance on using composite materials to reinforce defects such as crack-like-flaws has been added;
the test method for determining the value of design strain specified in Annex E has been revised to remove the influence of the substrate in testing;
units for variables has been standardised throughout. The main change is for the value of energy release rate, γ_LCL, which will now be in N mm rather than J m^-2;
Annex I has been added to provide guidance on how to assess requirements for applying repairs to Type B defects.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

The objective of this document is to ensure that piping, pipelines, tanks and vessels repaired using composite systems that are qualified, designed, installed and managed using this document meet the specified performance requirements. The main users of this document are plant and equipment owners, design contractors, suppliers contracted to provide the repair system, certifying authorities, installation, maintenance and inspection contractors.

1 Scope

This document specifies requirements and gives recommendations for the qualification and design, installation, testing and integrity management for the external application of composite repair systems to corroded or damaged piping and pipelines, tanks and vessels.

2 Normative references

3 Terms and definitions

4 Symbols and abbreviated terms

4.1 Symbols

4.2 Abbreviated terms

5 Applications

6 Summary of key issues

6.1 General

6.2 Repair system qualification

6.3 Enquiry stage

6.4 Design of repair

6.5 Installer training

6.6 Installation of repair

6.7 Ongoing integrity management of the repaired system

7 Qualification

7.1 Repair system qualification data

7.2 Re-qualification of the repair system

8 Repair feasibility assessment

8.1 General

8.2 Repair class

8.3 Required data

9 Design methodology

9.1 Design lifetime and initial service life

9.2 Environmental compatibility

9.3 Design temperature effects

9.4 Cyclic loading

9.5 Determination of design strains

9.6 Determination of equivalent load and equivalent pressure

9.7 Design of repairs for Type A defects

9.8 Design of repairs for Type B defects

9.9 External loads

9.10 Other defects (with assessments based on substrate stress)

9.11 Repair of other components

9.12 Axial extent of repair

9.13 Calculation of the composite laminate thickness, t_d

9.14 Confirmation that composite laminate thickness is within acceptable limits

9.15 Calculation of total repair length

9.16 Design output

9.17 Optional design considerations

10 Installation

10.1 Storage conditions

10.2 Documentation prior to repair application

10.3 Installer and supervisor qualifications

10.4 Installation procedure

10.5 Repair completion documentation

10.6 Live repairs

10.7 Repair of clamps, piping components, tanks, or vessels

10.8 Environmental considerations

10.9 Repair of defects within the repair system

11 Ongoing integrity management

11.1 General

11.2 Record keeping

11.3 In-service inspection

11.4 Allowable defects for the repair system

11.5 Repair system maintenance and remedial options

11.6 Repair lifetime considerations

11.7 Modifications

12 System testing

13 Decommissioning

Bibliography