ISO 24131-2:2023

Internal protection by polymeric lining for ductile iron pipes — Requirements and test methods — Part 2: Epoxy lining

This document specifies the requirements and test methods applicable to factory applied internal epoxy lining for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631. It covers internal linings for use in the conveyance of raw water, potable water and sewage water for operating temperature up to 50 °C.

Protection interne des tuyaux en fonte ductile par revêtement polymérique — Exigences et méthodes d'essai — Partie 2: Revêtement époxy

General Information

• Status: Published
• Publication Date: 30-Mar-2023
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: ISO/TC 5/SC 2 - Cast iron pipes, fittings and their joints
• Drafting Committee: ISO/TC 5/SC 2 - Cast iron pipes, fittings and their joints
• Current Stage: 6060 - International Standard published
• Start Date: 31-Mar-2023
• Due Date: 28-Apr-2024
• Completion Date: 31-Mar-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24131-2
First edition
2023-03
Internal protection by polymeric
lining for ductile iron pipes —
Requirements and test methods —
Part 2:
Epoxy lining
Protection interne des tuyaux en fonte ductile par revêtement
polymérique — Exigences et méthodes d'essai —
Partie 2: Revêtement époxy
Reference number
ISO 24131-2:2023(E)
© ISO 2023

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ISO 24131-2:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© 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 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 24131-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 3
4.1 General . 3
4.2 Surface preparation . 3
4.3 Lining appearance . 4
4.4 Minimum lining thickness . 4
4.5 Adhesion (pull off test/cross cut knife test) . 4
4.6 Cross linkage (MIBK/ΔTg) . 4
4.7 Non-porosity . 4
4.8 Protection of pipe ends . 4
4.9 Marking . 5
4.10 Repairs . 5
5 Performance requirements . .5
5.1 General . 5
5.2 Materials in contact with water intended for human consumption . 5
5.3 Abrasion resistance only for sewage applications . 5
5.4 Chemical resistance only for sewage applications . 6
5.5 Impact resistance . 6
5.6 Indirect impact resistance . 6
5.7 Resistance to hot water . 6
5.8 Resistance to ovalization . 6
6 Test methods . 6
6.1 Routine tests . . 6
6.1.1 Surface preparation . 6
6.1.2 Lining appearance . . 6
6.1.3 Lining thickness . 7
6.1.4 Adhesion . 7
6.1.5 Cross linkage (MIBK/ΔTg). 7
6.1.6 Non-porosity . 7
6.1.7 Marking . . . 7
6.1.8 Repairs . 7
6.2 Performance test . 8
6.2.1 Abrasion resistance only for sewage applications . 8
6.2.2 Chemical resistance only for sewage applications . 8
6.2.3 Impact resistance . 8
6.2.4 Indirect impact resistance . 8
6.2.5 Resistance to hot water . 8
6.2.6 Resistance to ovalization . 8
Annex A (normative) Quality assurance .10
Annex B (normative) Cross cut knife test method .12
Annex C (informative) Handling, transportation and storage .13
Bibliography .14
iii
© ISO 2023 – All rights reserved

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ISO 24131-2:2023(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 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 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
A list of all parts in the ISO 24131 series can be found on the ISO website.
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.
iv
  © ISO 2023 – All rights reserved

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ISO 24131-2:2023(E)
Introduction
The ISO 24131 series specifies the requirements and test methods applicable to factory applied
polymeric linings for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631. The ISO 24131
series is intended to include several types of polymeric linings.
v
© ISO 2023 – All rights reserved

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INTERNATIONAL STANDARD ISO 24131-2:2023(E)
Internal protection by polymeric lining for ductile iron
pipes — Requirements and test methods —
Part 2:
Epoxy lining
1 Scope
This document specifies the requirements and test methods applicable to factory applied internal
epoxy lining for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631.
It covers internal linings for use in the conveyance of raw water, potable water and sewage water for
operating temperature up to 50 °C.
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 2531, Ductile iron pipes, fittings, accessories and their joints for water applications
ISO 4624, Paints and varnishes — Pull-off test for adhesion
ISO 7186:2011, Ductile iron products for sewerage applications
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature and step height
ISO 16631, Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE)
piping systems, for water applications and for plastic pipeline connections, repair and replacement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2531 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
epoxy lining
factory applied lining
Note 1 to entry: It can be with either
— fusion bonded epoxy powder applied by spraying or dipping in a fluidised bed on preheated parts, with or
without post curing, or
— two-pack liquid epoxy consisting of a base and a catalyst component which are mixed together in the
proportion specified by the manufacturer before application.
Note 2 to entry: See Figure 1.
1
© ISO 2023 – All rights reserved

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ISO 24131-2:2023(E)
Key
1 gasket seat
2 pipe barrel
3 spigot end
4 lining
5 internal socket profile
Figure 1 — Location of the defined pipe areas
3.2
epoxy
family of basic components or cured end products of epoxy resins, which are a class of reactive
prepolymers and polymers which contain epoxide groups
Note 1 to entry: Epoxy is created by mixing two different compounds known as a resin and a hardener.
3.3
operating temperature
applicable temperatures under which the product maintains its properties
3.4
chalking
superficial reaction of epoxy lining (3.1) due to exposure to UV-radiation
Note 1 to entry: The process is confined to the surface only and results in a dulling of the surface.
3.5
minimum lining thickness
minimum value of the lining thickness measured at the lined item
3.6
local thickness
measured thickness at any one point of one lined product
3.7
adhesion
pull off test
force per unit area, applied perpendicular to the surface, which is necessary to separate the lining from
its substrate
3.8
cross linkage
chemical reaction between epoxy resin and hardener to form the final cured lining
3.9
non-porosity
absence of electrical puncture in a high voltage test (holiday test) under defined test conditions
2
  © ISO 2023 – All rights reserved

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ISO 24131-2:2023(E)
3.10
protection of pipe ends
factory applied coating/lining on spigot end and internal socket profile of pipes
Note 1 to entry: See Figure 1.
3.11
abrasion resistance
ability of materials and structures to withstand abrasion
3.12
impact resistance
energy which a lining can withstand without damage under defined test conditions
3.13
indirect impact resistance
impact energy applied from outside of the pipe with deformation to which a lining can withstand
without damage under defined test conditions
3.14
ovalization
100 times the measured vertical deflection, (caused by the applied load) divided by the measured pipe
external diameter
3.15
routine test
test carried out to control the manufacturing process
Note 1 to entry: The frequency of the test is defined by this document or the manufacturer.
3.16
performance test
test which is done once and thereafter only when there is a change in the lining material or lining
process
4 Technical requirements
4.1 General
The following technical requirements shall be demonstrated by routine tests applied in production,
on in-process and finished lined products with defined frequency. Routine tests shall be in accordance
with the overview of requirements provided in Table A.2.
Quality assurance for epoxy lining shall be in accordance with Annex A.
4.2 Surface preparation
Prior to lining application, all surfaces to be lined shall be substantially clean and free from oil, grease
and moisture.
In cold weather, or anytime when moisture tends to condense on the surface of the pipe, it shall be
uniformly warmed for sufficient time to dry prior to cleaning. The surface temperature shall be
maintained at least 3 °C above the dew point.
Surface preparation shall be designed in order to reach the required performances specified in this
document. It is the responsibility of the manufacturer to demonstrate the fitness for purpose of surface
3
© ISO 2023 – All rights reserved

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ISO 24131-2:2023(E)
preparation technology and to put in place a quality control procedure to ensure the stability of those
performances.
NOTE The requirements of Class Sa 2.5 of ISO 8501-1 and ≤ Rating 3 dust quantity and Class 2 for dust size of
ISO 8502-3 can be applied.
4.3 Lining appearance
The lining of the final product shall be of
— uniform colour, except for permitted marking;
— uniform appearance and smoothness, except for allowable repairs;
— free of visible defects (i.e. pinholes, bubbles, blisters, wrinkles, cracks or voids).
Slight superficial colour variations due to repairs or long exposure to sunlight (chalking) are
permissible.
4.4 Minimum lining thickness
When measured in accordance with the method defined in 6.1.3, the minimum local thickness shall be
greater than 200 μm and the minimum average thickness shall be greater than or equal to 250 μm.
4.5 Adhesion (pull off test/cross cut knife test)
Adhesion (pull off test) shall be tested in accordance with the test method defined
...

ISO/DISFDIS 24131-2:2022(E)
ISO TC 5/SC 2/WG 24
Date: 2022-06-0812-22
Secretariat: AFNOR

Internal protection by polymeric lining for ductile iron pipes — Requirements and test methods
— Part 2: Epoxy lining

---------------------- Page: 1 ----------------------
ISO/DISFDIS 24131-2:2022(E)
© ISO 2022
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2022 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DISFDIS 24131-2:2022(E)
Contents
Foreword . iv
Introduction. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 3
5 Performance requirements . 5
6 Test methods . 7
Annex A (normative) Quality assurance . 10
Annex B (normative) Cross cut knife test method . 12
Annex C (informative) Handling, transportation and storage . 13
Bibliography . 14
© ISO 2022 – All rights reserved iii

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ISO/DISFDIS 24131-2:2022(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 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 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
A list of all parts in the ISO 24131 series can be found on the ISO website.
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.
iv © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/DISFDIS 24131-2:2022(E)
Introduction
The ISO 24131 series specifies the requirements and test methods applicable to factory applied polymeric
linings for ductile iron pipes suppliedaccording to ISO 2531, ISO 7186 and ISO 16631. The ISO 24131
series includesis intended to include several types of polymeric linings.
© ISO 2022 – All rights reserved v

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FINAL DRAFT INTERNATIONAL STANDARD ISO/DISFDIS 24131-2:2022(E)

Internal protection by polymeric lining for ductile iron pipes —
Requirements and test methods — Part 2: Epoxy lining
1 Scope
This document specifies the requirements and test methods applicable to factory applied internal epoxy
lining for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631.
It covers internal linings for use in the conveyance of raw water, potable water and sewage water for
operating temperature up to 50 °C.
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 2531, Ductile iron pipes, fittings, accessories and their joints for water applications
ISO 7186:2011, Ductile iron products for sewerage applications
ISO 16631, Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE) piping
systems, for water applications and for plastic pipeline connections, repair and replacement
ISO 4624, Paints and varnishes — Pull-off test for adhesion
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass
transition temperature and step height
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2531 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
epoxy lining
factory applied lining
Note 1 to entry: It can be with either
— fusion bonded epoxy powder applied by spraying or dipping in a fluidised bed on preheated parts, with or
without post curing, or
— two-pack liquid epoxy consisting of a base and a catalyst component which are mixed together in the
proportion specified by the manufacturer before application.
© ISO 2022 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO/DISFDIS 24131-2:2022(E)
Note 2 to entry: See Figure 1.


Key
1 gasket seat
2 pipe barrel
3 spigot end
4 lining
5 internal socket profile
Figure 1 — Location of the defined pipe areas
3.2
epoxy
the family of basic components or cured end products of epoxy resins, which are a class of reactive
prepolymers and polymers which contain epoxide groups
Note 1 to entry: Epoxy is created by mixing two different compounds known as a resin and a hardener.
3.3
operating temperature
applicable temperatures under which the product maintains its properties
3.4
chalking
superficial reaction of epoxy lining (3.1) due to exposure to UV-radiation
Note 1 to entry: The process is confined to the surface only and results in a dulling of the surface.
3.5
minimum lining thickness
minimum value of the lining thickness measured at the lined item
3.6
2 © ISO 2022 – All rights reserved

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ISO/DISFDIS 24131-2:2022(E)
local thickness
measured thickness at any one point of one lined product
3.7
adhesion
pull off test
force per unit area, applied perpendicular to the surface, which is necessary to separate the lining from
its substrate
3.8
cross linkage
chemical reaction between epoxy resin and hardener to form the final cured lining
3.9
non-porosity
absence of electrical puncture in a high voltage test (holiday test) under defined test conditions
3.10
protection of pipe ends
factory applied coating/lining on spigot end and internal socket profile of pipes
Note 1 to entry: See Figure 1.
3.11
abrasion resistance
ability of materials and structures to withstand abrasion
3.12
impact resistance
energy which a lining can withstand without damage under defined test conditions
3.13
indirect impact resistance
impact energy applied from outside of the pipe with deformation to which a lining can withstand without
damage under defined test conditions
3.14
ovalization
100 times the measured vertical deflection, (caused by the applied load) divided by the measured pipe
external diameter
3.15
routine test
test carried out to control the manufacturing process
Note 1 to entry: The frequency of the test is defined by this document or the manufacturer.
3.16
performance test
test which is done once and thereafter only when there is a change in the lining material or lining process
© ISO 2022 – All rights reserved 3

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ISO/DISFDIS 24131-2:2022(E)
4 Technical requirements
4.1 General
The following technical requirements shall be demonstrated by routine tests applied in production, on
in-process and finished lined products with defined frequency. Routine tests shall be in accordance with
the overview of requirements provided in Table A.2.
The information about qualityQuality assurance for epoxy lining is givenshall be in accordance with
Annex A.
4.2 Surface preparation
Prior to lining application, all surfaces to be lined shall be substantially clean and free from oil, grease and
moisture.
In cold weather, or anytime when moisture tends to condense on the surface of the pipe, it shall be
uniformly warmed for sufficient time to dry prior to cleaning. The surface temperature shall be
maintained at least 3 °C above the dew point.
Surface preparation shall be designed in order to reach the required performances specified in this
document. It is the responsibility of the manufacturer to demonstrate the fitness for purpose of surface
preparation technology and to put in place a quality control procedure to ensure the stability of those
performances.
NOTE The requirements of Class Sa 2.5 of ISO 8501-1 and ≤ Rating 3 dust quantity and Class 2 for dust size of
ISO 8502-3 can be applied.
4.3 Lining appearance
The lining of the final product shall be of
— uniform colour, except for permitted marking;
— uniform appearance and smoothness, except for allowable repairs;
— free of visible defects (i.e. pinholes, bubbles, blisters, wrinkles, cracks or voids).
Slight superficial colour variations due to repairs or long exposure to sunlight (chalking) are permissible.
4.4 Minimum lining thickness
When measured in accordance with the method defined in 6.1.3, the minimum local thickness shall be
greater than 200 μm and the minimum average thickness shall be greater than or equal to 250 μm.
4.5 Adhesion (pull off test/cross cut knife test)
Adhesion (pull off test) shall be tested in accordance with the test method defined in 6.1.4 on production
samples.
The lining adhesion shall achieve an average value of at least 8,0 MPa and a minimum single value of
6,0 MPa. The manufacturer shall determine the test locations on the products.
Alternatively, the adhesion test can also be done by cross cut knife test method. Where the cross knife
test is chosen for adhesion, it shall be carried out according to Annex B. The adhesion rating shall be no
more than level 2.
4 © ISO 2022 – All rights reserved

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ISO/DISFDIS 24131-2:2022(E)
4.6 Cross linkage (MIBK/ΔTg)
When tested in accordance with the test method defined in 6.1.5, after wiping with a methyl isobutyl
ketone (MIBK) solution, the cloth and the lining surface shall be visually examined. Any discolouration,
matting and/or smearing observed shall not exceed the limits specified by the lining manufacturer.
Alternatively, the cross linkage of lining can be determined by its change in glass transition temperature
(ΔTg) and ΔTg shall be no more than 5 °C.
4.7 Non-porosity
When tested in accordance with the test method described in 6.1.6, with a voltage of 1 500 V, the lined
body of the product shall be free from porosity. This means that no electrical puncture should occur. This
requirement does not apply to pipe ends.
The electrode shall not be damaged and shall be in constant touch with the lining.
4.8 Protection of pipe ends
Spigot end and internal socket profile (see Figure 1) shall be coated in accordance with ISO 2531,
ISO 7186 and ISO 16631.
4.9 Marking
All pipes shall be marked legibly and durably according to the pipe standards, ISO 2531, ISO 7186 and
ISO 16631. Reference to this document shall be legibly and durably applied by any method upon the
external surface.
Marking shall be checked in accordance with the test method described in 6.1.7.
4.10 Repairs
Repairs shall be carried out when there is a fault. The fault can be
— localized damage,
— holding point,
— earthing surface for the non-porosity test, or
— other lining fault.
The lining manufacturer should establish the repair procedure. The material to be used shall satisfy two
conditions:
— be suitable for protecting pipes under the required service conditions;
— be compatible in all aspects with the previously applied lining.
The repairs shall conform to the requirements specified in 4.4, 4.6 and 4.7.
The information about handling, transportation and storage of epoxy lined pipes is given in Annex C.
5 Performance requirements
5.1 General
The following technical requirements shall be demonstrated by performance tests in order to verify the
lining material and process prior to production lining. Performance tests shall be in accordance with the
© ISO 2022 – All rights reserved 5

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ISO/DISFDIS 24131-2:2022(E)
overview of requirements provided in Table A.1. Where there is a change of lining material or process,
the performance tests shall be undertaken on the new lining material or process.
5.2 Materials in contact with water intended for human consumption
When used under the conditions for which they it is designed, in permanent or in temporary contact with
water intended for human consumption, the lining shall not have any detrimental effects on the
properties of that water for its intended use.
When used for conveying water intend
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 24131-2
ISO/TC 5/SC 2
Internal protection by polymeric
Secretariat: AFNOR
lining for ductile iron pipes —
Voting begins on:
2023-01-05 Requirements and test methods —
Voting terminates on:
Part 2:
2023-03-02
epoxy lining
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 24131-2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 24131-2:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 24131-2
ISO/TC 5/SC 2
Internal protection by polymeric
Secretariat: AFNOR
lining for ductile iron pipes —
Voting begins on:
Requirements and test methods —
Voting terminates on:
Part 2:
epoxy lining
COPYRIGHT PROTECTED DOCUMENT
© 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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 24131-2:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 2 ----------------------
ISO/FDIS 24131-2:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 3
4.1 General . 3
4.2 Surface preparation . 3
4.3 Lining appearance . 4
4.4 Minimum lining thickness . 4
4.5 Adhesion (pull off test/cross cut knife test) . 4
4.6 Cross linkage (MIBK/ΔTg) . 4
4.7 Non-porosity . 4
4.8 Protection of pipe ends . 4
4.9 Marking . 5
4.10 Repairs . 5
5 Performance requirements . .5
5.1 General . 5
5.2 Materials in contact with water intended for human consumption . 5
5.3 Abrasion resistance only for sewage applications . 5
5.4 Chemical resistance only for sewage applications . 6
5.5 Impact resistance . 6
5.6 Indirect impact resistance . 6
5.7 Resistance to hot water . 6
5.8 Resistance to ovalization . 6
6 Test methods . 6
6.1 Routine tests . . 6
6.1.1 Surface preparation . 6
6.1.2 Lining appearance . . 6
6.1.3 Lining thickness . 7
6.1.4 Adhesion . 7
6.1.5 Cross linkage (MIBK/ΔTg). 7
6.1.6 Non-porosity . 7
6.1.7 Marking . . . 7
6.1.8 Repairs . 7
6.2 Performance test . 8
6.2.1 Abrasion resistance only for sewage applications . 8
6.2.2 Chemical resistance only for sewage applications . 8
6.2.3 Impact resistance . 8
6.2.4 Indirect impact resistance . 8
6.2.5 Resistance to hot water . 8
6.2.6 Resistance to ovalization . 8
Annex A (normative) Quality assurance .10
Annex B (normative) Cross cut knife test method .12
Annex C (informative) Handling, transportation and storage .13
Bibliography .14
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ISO/FDIS 24131-2:2022(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 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 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
A list of all parts in the ISO 24131 series can be found on the ISO website.
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.
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ISO/FDIS 24131-2:2022(E)
Introduction
The ISO 24131 series specifies the requirements and test methods applicable to factory applied
polymeric linings for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631. The ISO 24131
series is intended to include several types of polymeric linings.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 24131-2:2022(E)
Internal protection by polymeric lining for ductile iron
pipes — Requirements and test methods —
Part 2:
epoxy lining
1 Scope
This document specifies the requirements and test methods applicable to factory applied internal
epoxy lining for ductile iron pipes according to ISO 2531, ISO 7186 and ISO 16631.
It covers internal linings for use in the conveyance of raw water, potable water and sewage water for
operating temperature up to 50 °C.
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 2531, Ductile iron pipes, fittings, accessories and their joints for water applications
ISO 7186:2011, Ductile iron products for sewerage applications
ISO 16631, Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE)
piping systems, for water applications and for plastic pipeline connections, repair and replacement
ISO 4624, Paints and varnishes — Pull-off test for adhesion
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature and step height
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2531 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
epoxy lining
factory applied lining
Note 1 to entry: It can be with either
— fusion bonded epoxy powder applied by spraying or dipping in a fluidised bed on preheated parts, with or
without post curing, or
— two-pack liquid epoxy consisting of a base and a catalyst component which are mixed together in the
proportion specified by the manufacturer before application.
Note 2 to entry: See Figure 1.
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ISO/FDIS 24131-2:2022(E)
Key
1 gasket seat
2 pipe barrel
3 spigot end
4 lining
5 internal socket profile
Figure 1 — Location of the defined pipe areas
3.2
epoxy
family of basic components or cured end products of epoxy resins, which are a class of reactive
prepolymers and polymers which contain epoxide groups
Note 1 to entry: Epoxy is created by mixing two different compounds known as a resin and a hardener.
3.3
operating temperature
applicable temperatures under which the product maintains its properties
3.4
chalking
superficial reaction of epoxy lining (3.1) due to exposure to UV-radiation
Note 1 to entry: The process is confined to the surface only and results in a dulling of the surface.
3.5
minimum lining thickness
minimum value of the lining thickness measured at the lined item
3.6
local thickness
measured thickness at any one point of one lined product
3.7
adhesion
pull off test
force per unit area, applied perpendicular to the surface, which is necessary to separate the lining from
its substrate
3.8
cross linkage
chemical reaction between epoxy resin and hardener to form the final cured lining
3.9
non-porosity
absence of electrical puncture in a high voltage test (holiday test) under defined test conditions
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ISO/FDIS 24131-2:2022(E)
3.10
protection of pipe ends
factory applied coating/lining on spigot end and internal socket profile of pipes
Note 1 to entry: See Figure 1.
3.11
abrasion resistance
ability of materials and structures to withstand abrasion
3.12
impact resistance
energy which a lining can withstand without damage under defined test conditions
3.13
indirect impact resistance
impact energy applied from outside of the pipe with deformation to which a lining can withstand
without damage under defined test conditions
3.14
ovalization
100 times the measured vertical deflection, (caused by the applied load) divided by the measured pipe
external diameter
3.15
routine test
test carried out to control the manufacturing process
Note 1 to entry: The frequency of the test is defined by this document or the manufacturer.
3.16
performance test
test which is done once and thereafter only when there is a change in the lining material or lining
process
4 Technical requirements
4.1 General
The following technical requirements shall be demonstrated by routine tests applied in production,
on in-process and finished lined products with defined frequency. Routine tests shall be in accordance
with the overview of requirements provided in Table A.2.
Quality assurance for epoxy lining shall be in accordance with Annex A.
4.2 Surface preparation
Prior to lining application, all surfaces to be lined shall be substantially clean and free from oil, grease
and moisture.
In cold weather, or anytime when moisture tends to condense on the surface of the pipe, it shall be
uniformly warmed for sufficient time to dry prior to cleaning. The surface temperature shall be
maintained at least 3 °C above the dew point.
Surface preparation shall be designed in order to reach the required performances specified in this
document. It is the responsibility of the manufacturer to demonstrate the fitness for purpose of surface
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ISO/FDIS 24131-2:2022(E)
preparation technology and to put in place a quality control procedure to ensure the stability of those
performances.
NOTE The requirements of Class Sa 2.5 of ISO 8501-1 and ≤ Rating 3 dust quantity and Class 2 for dust size of
ISO 8502-3 can be applied.
4.3 Lining appearance
The lining of the final product shal
...