EN ISO 24817:2017

SLOVENSKI STANDARD
01-november-2017
Nadomešča:
SIST EN ISO 24817:2015
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina -
Popravila cevovodov s kompozitnimi materiali - Ocenitev in načrtovanje, montaža,
preskušanje in nadzor (ISO 24817:2017, popravljena različica 2018-01-01)
Petroleum, petrochemical and natural gas industries - Composite repairs for pipework -
Qualification and design, installation, testing and inspection (ISO 24817:2017, Corrected
version 2018-01-01)
Erdöl-, petrochemische und Erdgasindustrie - Reparatur von Rohrleitungen mit
Verbundwerkstoffen - Bewertung und Ausführung, Montage, Test und Inspektion (ISO
24817:2017, korrigierte Fassung 2018-01-01)
Industries du pétrole, de la pétrochimie et du gaz naturel - Réparations en matériau
composite pour canalisations - Qualification et conception, installation, essai et
inspection (ISO 24817:2017, Version corrigée 2018-01-01)
Ta slovenski standard je istoveten z: EN ISO 24817:2017
ICS:
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 24817
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 75.180.20 Supersedes EN ISO 24817:2015
English Version
Petroleum, petrochemical and natural gas industries -
Composite repairs for pipework - Qualification and design,
installation, testing and inspection (ISO 24817:2017,
Corrected version 2018-01-01)
Industries du pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie -
naturel - Réparations en matériau composite pour Reparatur von Rohrleitungen mit Verbundwerkstoffen
canalisations - Conformité aux exigences de - Bewertung und Ausführung, Montage, Test und
performance et conception, installation, essai et Inspektion (ISO 24817:2017, korrigierte Fassung
inspection (ISO 24817:2017, Version corrigée 2018- 2018-01-01)
01-01)
This European Standard was approved by CEN on 5 September 2017.

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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24817:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European Foreword
This document (EN ISO 24817:2017) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for
petroleum, petrochemical and natural gas industries” 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 2018 and conflicting national standards shall be
withdrawn at the latest by March 2018.
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 24817:2015.
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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 24817:2017, Corrected version 2018-01-01 has been approved by CEN as EN ISO
24817:2017 without any modification.

INTERNATIONAL ISO
STANDARD 24817
Second edition
2017-08
Corrected version
2018-01
Petroleum, petrochemical and natural
gas industries — Composite repairs
for pipework — Qualification and
design, installation, testing and
inspection
Industries du pétrole, de la pétrochimie et du gaz naturel —
Réparations en matériau composite pour canalisations — Conformité
aux exigences de performance et conception, installation, essai et
inspection
Reference number
ISO 24817:2017(E)
©
ISO 2017
ISO 24817:2017(E)
© ISO 2017, Published in Switzerland
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
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the requester.
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 24817:2017(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 6
4.1 Symbols . 6
4.2 Abbreviated terms . 9
5 Applications . 9
6 Summary of key issues .11
7 Qualification and design .13
7.1 Repair feasibility assessment .13
7.2 Repair class .14
7.3 Repair design lifetime .14
7.4 Required data .15
7.4.1 Background.15
7.4.2 Original equipment design data .15
7.4.3 Maintenance and operational histories .15
7.4.4 Service condition data .15
7.4.5 Repair system qualification data.16
7.5 Design methodology.17
7.5.1 Overview .17
7.5.2 Environmental compatibility .19
7.5.3 Design temperature effects .19
7.5.4 Design based on substrate load sharing (defect type A) .21
7.5.5 Design based on repair laminate allowable strains (defect type A) .23
7.5.6 Design based on repair-allowable stresses determined by performance
testing (defect type A) .24
7.5.7 Design of repairs for through-wall defects (defect type B) .25
7.5.8 Axial extent of repair .28
7.5.9 Optional design considerations .30
7.5.10 Dent and/or gouge type defects .34
7.5.11 Fretting type defects .34
7.5.12 Delamination or blister type defects .34
7.5.13 Repair of other components .35
7.5.14 Design output .38
7.6 Re-qualification of the repair system .38
7.6.1 Overview .38
7.6.2 For type A defect repairs .38
7.6.3 For type B defect repairs .38
8 Installation .39
8.1 Storage conditions .39
8.2 Documentation prior to repair application .39
8.2.1 Method statement .39
8.2.2 Work pack .39
8.3 Installer qualifications .40
8.4 Installation procedure .40
8.5 Repair completion documentation .41
8.6 Live repairs .43
8.7 Repair of clamps, piping components, tanks, or vessels .43
8.8 Environmental considerations .43
ISO 24817:2017(E)
9 Testing and inspection .43
9.1 General .43
9.2 Allowable defects for the repair system .44
9.3 Repair of defects within the repair system .47
9.4 Inspection methods .48
9.5 Repair system maintenance and remedial options .48
9.5.1 Overview .48
9.5.2 Condition of the repair - visual inspection .48
9.5.3 Condition of the pipe substrate .49
9.5.4 Remedial options .49
9.5.5 Extension (revalidation) of repair design lifetime .49
9.5.6 Future modifications .50
10 System testing .50
11 Decommissioning .51
Annex A (normative) Design data sheet.52
Annex B (normative) Qualification data .55
Annex C (normative) Short-term pipe spool survival test .59
Annex D (normative) Measurement of γ for through-wall defect calculation .61
LCL
Annex E (normative) Measurement of performance test data .64
Annex F (normative) Measurement of impact performance .67
Annex G (normative) Measurement of the degradation factor .68
Annex H (informative) Axial extent of repair look-up table .70
Annex I (normative) Installer qualification .72
Annex J (informative) Installation requirements and guidance .75
Annex K (informative) Design considerations.77
Annex L (informative) Management of the integrity of composite repair systems to
pipework and vessels .82
Bibliography .86
iv © ISO 2017 – All rights reserved

ISO 24817:2017(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 (see 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 (see 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 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 the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing
equipment and systems.
This second edition cancels and replaces the first edition (ISO 24817:2015), which has been technically
revised.
This corrected version of ISO 24817:2017 incorporates the following correction:
— in 7.5.7, Formula (15), “D4” has been replaced by “D ”.
ISO 24817:2017(E)
Introduction
The objective of this document is to ensure that pipework, pipelines, tanks and vessels repaired using
composite systems that are qualified, designed, installed and inspected using this document will meet
the specified performance requirements. Repair systems are designed for use within the petroleum,
petrochemical and natural gas industries, and also within utility service applications. The main users
of this document will be plant and equipment owners of the pipework and vessels, design contractors,
suppliers contracted to provide the repair system, certifying authorities, installation, maintenance and
inspection contractors.
vi © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 24817:2017(E)
Petroleum, petrochemical and natural gas industries —
Composite repairs for pipework — Qualification and
design, installation, testing and inspection
1 Scope
This document gives requirements and recommendations for the qualification and design, installation,
testing and inspection for the external application of composite repair systems to corroded or damaged
pipework, pipelines, tanks and vessels used in the petroleum, petrochemical and natural gas industries.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 75-3, Plastics — Determination of temperature of deflection under load — Part 3: High-strength
thermosetting laminates and long-fibre-reinforced plastics
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-4, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and
orthotropic fibre-reinforced plastic composites
ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore
hardness)
ISO 10952, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings —
Determination of the resistance to chemical attack for the inside of a section in a deflected condition
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature and glass transition step height
ISO 11359-2, Plastics — Thermomechanical analysis (TMA) — Part 2: Determination of coefficient of linear
thermal expansion and glass transition temperature
ISO 14692, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping
ASTM C581, Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-
Reinforced Structures Intended for Liquid Service
ASTM D543, Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents
ASTM D696, Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between Minus
30°C and 30°C with a Vitreous Silica Dilatometer
ASTM D1598, Standard Test Method for Time-to-Failure of Plastic Pipe under Constant Internal Pressure
ASTM D1599, Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing,
and Fittings
ASTM D2583, Standard Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol
Impressor
ASTM D2992, Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for Fiberglass (Glass-
Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings
ISO 24817:2017(E)
ASTM D3039, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials
ASTM D3165, Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading of
Single-Lap-Joint Laminated Assemblies
ASTM D3681, Standard Test Method for Chemical Resistance of Fiberglass (Glass-Fiber-Reinforced
Thermosetting Resin) Pipe in a Deflected Condition
ASTM D5379, Standard Test Method for Shear Properties of Composite Materials by the V-Notched
Beam Method
ASTM D6604, Standard Practice for Glass Transition Temperatures of Hydrocarbon Resins by Differential
Scanning Calorimetry
ASTM E831, Standard Test Method for Linear Thermal Expansion of Solid Materials by Thermomechanical
Analysis
ASTM E1640, Standard Test Method for Assignment of the Glass Transition Temperature by Dynamic
Mechanical Analysis
ASTM E2092, Standard  Test  Method  for  Distortion  Temperature  in  Three-Point  Bending  by
Thermomechanical Analysis
ASTM G8, Standard Test Methods for Cathodic Disbonding of Pipeline Coatings
BS 7910, Guide to methods for assessing the acceptability of flaws in metallic structures
EN 59, Methods of testing plastics — Glass reinforced plastics — Measurement of hardness by means of a
Barcol impressor (BS 2782-10, Method 1001, Measurement of hardness by means of a Barcol impresser)
EN 1465, Adhesives — Determination of tensile lap shear strength of rigid-to-rigid bonded assemblies
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
anisotropic
exhibiting different physical properties in different directions
3.2
Barcol hardness
measure of surface hardness using a surface impresser
3.3
blister
air void between layers within the laminate visible on the surface as a raised area
3.4
composite
thermoset resin system that is reinforced by fibres
3.5
crack
split in the laminate extending through the wall (perpendicular to the surface) such that there is actual
separation with opposite surfaces visible
2 © ISO 2017 – All rights reserved

ISO 24817:2017(E)
3.6
cure
curing
setting of a thermosetting resin system, such as polyester or epoxy, by an irreversible chemical reaction
3.7
cure schedule
time-temperature profile qualified to generate a specified T or HDT
g
3.8
defect type A
defect within the substrate, not through-wall and not expected to become through-wall within the
repair design lifetime of the repair system
3.9
defect type B
through-wall defect or a defect within the substrate where at the end of service life the remaining wall
thickness is less than 1 mm
3.10
defined lifetime
actual application or service lifetime of the repair
3.11
delamination
area between the repair laminate and the substrate which should be bonded together but where no
bond exists, or an area of separation between layers in the repair laminate
3.12
design lifetime
maximum application lifetime of the repair
3.13
differential scanning calorimetry
DSC
method of determining the glass transition temperature of a thermosetting resin
3.14
dry spot or un-impregnated/dry fibre
area of fibre not impregnated with resin, with bare, exposed fibre visible
3.15
engineered repair
repair which has been designed and applied under a specified, controlled process so that under the
design conditions, there is a high degree of confidence that the repair will maintain its integrity over
the design lifetime
3.16
exposed fibre
area of fibre not impregnated with resin that projects from the body of the repair
3.17
foreign matter
any substance other than the reinforcing fibre or other materials that form part of the repair system
3.18
finishing materials
final layer of material to help compact the repair laminate, typically a polymeric film or a fabric
Note 1 to entry: They should be fully removed after the repair has hardened and before the repair is inspected or
painted.
ISO 24817:2017(E)
3.19
glass transition temperature
temperature at which a resin undergoes a marked change in physical properties
3.20
hardener
component added to a thermosetting resin to effect cure
3.21
heat distortion temperature
HDT
temperature at which a standard test bar deflects by a specified amount under a given load
3.22
installer
person who is qualified to apply a composite repair system
3.23
filler material
material used to repair external surface imperfections prior to the application of the composite laminate
3.24
laminate
repair laminate
part of a repair system that is the composite
Note 1 to entry: Most composites considered in this document are composed of discrete lamina or layers which
are wrapped or stacked, one on top of the other. This stacked construction is the laminate.
3.25
layer
individual layer or wrap within the composite laminate
3.26
leak
condition of a substrate wall that can allow the contents to make contact with and act directly upon the
(composite) repair laminate
Note 1 to entry: This does not refer to a fluid leaking through a hole or breach in the substrate.
3.27
occasional load
load that occurs rarely and during a short time
Note 1 to entry: Occasional loads typically occur less than 10 times in the life of the component and each load
duration is less than 30 min.
3.28
owner
organization that owns or operates the substrate to be repaired
3.29
pin hole
pin-prick hole in the resin rich surface, not extending into the laminate
3.30
pipeline
pipe with components subject to the same design conditions used to transport fluids between plants
Note 1 to entry: Components include bends, flanges and valves.
4 © ISO 2017 – All rights reserved

ISO 24817:2017(E)
3.31
pipework
interconnected piping subject to the same set or sets of design conditions
3.32
piping
piping system
assemblies of piping components used to convey fluids within a plant
Note 1 to entry: Components include pipe, fittings, flanges, gaskets, bolting and valves. A piping system is often
above ground but sometimes buried.
3.33
pit
depression in the surface of the laminate
3.34
ply
single wrap or layer (lamina) of a repair laminate
3.35
post cure
additional elevated-temperature cure applied after resin has hardened to ensure the required glass
transition temperature is achieved
3.36
qualification application procedure
application procedure used to apply the repair system for the qualification tests
3.37
qualification test temperature
test temperature at which qualification testing of the repair system is performed
3.38
reinforcement
fibre embedded in the resin system
Note 1 to entry: Possible fibre materials include aramid, carbon, glass, polyester, or similar materials.
Reinforcement results in mechanical properties superior to those of the base resin.
3.39
repair system
system comprised of the substrate, composite material (repair laminate), filler material, adhesive and
including surface preparation and installation methods, used for repair of pipework
3.40
repair system installer
company that installs the repair system
3.41
repair system supplier
company that designs and supplies the repair system
3.42
resin system
all of the components that make up the matrix portion of a composite
Note 1 to entry: Often this includes a resin, filler(s), pigment, mechanical property modifiers and catalyst or
hardener.
ISO 24817:2017(E)
3.43
risk
event encompassing what can happen (scenario), its likelihood (probability) and its level or degree of
damage (consequences)
3.44
substrate
surface on which a repair is carried out
Note 1 to entry: The surface may belong to original pipework, pipework component, pipeline, tank, or vessel.
3.45
supervisor
experienced installer who is qualified by successfully completing the supervisor training course
3.46
Shore hardness
measure of surface hardness using a surface impresser or durometer
3.47
thermoset resin system
resin system that cannot be melted or remoulded following polymerization
3.48
wrinkle
wavy surface or distinct ridge in the laminate where the reinforcing fabric has creased during
application
4 Symbols and abbreviated terms
4.1 Symbols
α thermal expansion coefficient of substrate
s
α thermal expansion coefficient of the repair laminate for either the axial or circumferential
c
directions
c crack length
D original external diameter
D original external branch, tee, nozzle diameter
b
d diameter (or diameter of the equivalent circle) of the through-wall defect
ΔT difference between operation and installation temperatures
E tensile modulus of the composite laminate in the circumferential direction
c
E tensile modulus of the composite laminate in axial direction
a
E
ac
combined tensile modulus EE
ac
E tensile modulus of substrate
s
ε circumferential design strain
c
ε allowable circumferential strain
c0
6 © ISO 2017 – All rights reserved

ISO 24817:2017(E)
ε axial design strain
a
ε allowable axial strain
a0
σ lower confidence limit of the long-term strain determined by performance testing
lt
ε thermal strain
t
ε short-term failure strain of the composite laminate
short
F applied axial load
ax
F equivalent axial load
eq
F applied shear load
sh
f service factor for cyclic fatigue
c
f degradation factor for the long-term performance of repairs to through-wall defects
D
f service factor for repairs to through-wall defects
leak
f service factor for performance data
perf
f repair thickness increase factor for reduced available overlap length
th,overlay
f repair thickness increase factor for piping system or vessel component
th,stress
f temperature de-rating factor for composite laminate allowable strains
T1
f temperature de-rating factor for through-wall defect repair design
T2
ϕ angle subtended by axial slot
G shear modulus of the composite laminate γ toughness parameter (energy release rate) for
the composite laminate, steel interface
γ specific weight of soil
soilg
h burial depth
I second moment of area
l total axial length of repair
l available landing area (axial extent) of undamaged substrate
available
l axial extent of design thickness of repair
over
l axial length of defect
defect
l axial length of taper
taper
N number of cycles
M applied axial moment
ax
M applied torsional moment
to
n number of wraps or layers or repair laminate
p required design internal pressure
ISO 24817:2017(E)
p internal pressure after repair system is applied
after
p external design pressure
e
p equivalent design pressure
eq
p external soil pressure
ext,soil
p internal pressure within the substrate during application of the repair
live
p minimum (internal pressure) load (or stress) of the load cycle
min
p maximum (internal pressure) load (or stress) of the load cycle
max
p medium-term hydrostatic test pressure
mthp
p maximum allowable working pressure (MAWP)
s
p short-term hydrostatic test pressure
sthp
p initial test pressure
p fixed linear increase in test pressure
q tensile stress
R
p
c
min
cyclic loading severity, defined as: R =
c
p
max
s allowable stress of the substrate material
s measured yield stress of substrate or mill certification yield stress
a
T required design temperature
d
T glass transition temperature
g
T maximum operating temperature of repair system
m
T ambient (qualification) test temperature
amb
T qualification test temperature
test
t original wall thickness of substrate
t repair design lifetime
lifetime
t thickness of an individual wrap or layer of repair laminate
layer
t wall thickness of branch, tee
b
t wall thickness of flange
f
t design thickness of repair laminate
design
t minimum thickness of repair laminate
min
t minimum remaining substrate wall thickness
s
8 © ISO 2017 – All rights reserved

ISO 24817:2017(E)
τ lap shear strength
ν Poisson's ratio for the repair laminate
w (axial) width of circumferential slot defect
4.2 Abbreviated terms
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
API American Petroleum Institute
AWWA American Water Works Association
BS (BSI) British Standards Institute
CFRP carbon fibre-reinforced plastic
COSHH regulations for control of substances hazardous to health
CSWIP certification scheme for welding inspection personnel
DSC differential scanning calorimetry
FRP fibre-reinforced plastic
GRP glass-reinforced plastic
HDT heat distortion temperature
MAWP maximum allowable working pressure
MSDS materials safety data sheets
NDT non-destructive testing
OSHA Occupational Safety and Health Act
PCC Post-Construction Committee
SMYS specified minimum yield strength
5 Applications
The qualification and design, installation, testing and inspection procedures for composite repair
systems in this document cover situations involving the repair of damage commonly encountered in oil,
gas, utility pipework systems and vessels. The procedures are also applicable to the repair of pipelines,
caissons and storage tanks with appropriate consideration.
Procedures in this document cover the repair of metallic and GRP pipework, pipework components,
pipelines originally designed in accordance with a variety of standards, including ISO 15649, ISO 13623,
ISO 14692, ASME B31.1, ASME B31.3, ASME B31.4, ASME B31.8 and BS 8010.
This document is not a defect assessment standard. Within this document, no statements are made
regarding whether a specific defect is acceptable or unacceptable for repair. The document assumes
that a defect assessment has already been performed to, for example ASME B31G or API RP 579.
The starting point for this document is that a decision has been taken to repair a given defect with a
composite repair system and the output from the defect assessment, e.g. MAWP or minimum remaining
ISO 24817:2017(E)
wall thickness is used as input for the repair design. This document is concerned with the subsequent
activities of repair qualification, design, installation and inspection.
Repair systems are applied to restore structural integrity. The following repair situations are
addressed:
— external corrosion, where the defect is or is not through-wall. In this case, the application of a repair
system will usually arrest further deterioration;
— external damage such as dents, gouges and fretting (at supports);
— internal corrosion, erosion, where the defect is or is not through-wall. In this case, corrosion and/or
erosion can continue after application of a repair system, and therefore the design of the repair
system shall take this into account, i.e. the size of the defect at the end of the required design life of
the repair should be taken as the size of the defect when designing the repair;
— crack like defects, where the defect is or is not through wall. It is a requirement that the length of
the crack is known and will not increase during the lifetime of the repair. For through wall cracks,
the crack should be modelled as a Type B defect, either a circumferential or axial slot (depending on
the crack orientation). For non-through wall cracks, the crack should be modelled as Type A defect,
see 7.5.4;
— strengthening and/or stiffening in local areas.
As a general guide, Table 1 summarizes the types of defect that can be repaired using repair systems.
Table 1 — Guide to generic defect types
Applicability of repair Applicability of repair
Type of defect
system (metal pipes) system (GRP pipes)
General wall thinning Y Y
Local wall thinning Y Y
Pitting Y Y
Gouges/Dents R R
Blisters Y R
Laminations Y R
Circumferential cracks Y R
Longitudinal cracks R R
Through-wall penetration Y R
Y  Implies generally appropriate.
R  Implies can be used, but requires extra consideration, i.e. will the composite repair reduce locally the stresses acting
on the defect. For the case of gouges/dents or cracks, it will be required to assess whether application of the repair will
stop future crack growth or whether a conservative assumption about the ultimate length of the crack is required. If either
assessment is negative, then application of a composite repair is not appropriate.
Services that are covered within the scope of this document include those normally found in an oil and
gas production or processing installation. These include the following:
— utility fluid, diesel, seawater, air;
— chemicals (liquids)
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