Paints and varnishes - Friction-reduction coatings for the interior of on- and offshore steel pipelines for non-corrosive gases (ISO 15741:2016)

This document specifies requirements and methods of test for liquid epoxy paints and internal coatings of such paints in steel pipes and fittings for the conveyance of non-corrosive gas. It also deals with the application of the paint. Other paints or paint systems are not excluded provided they comply with the requirements given in this document. The coating consists of one layer, which is normally shop-applied on blast-cleaned steel by airless spray or other suitable spraying techniques. The applied and cured paint film must be smooth to give the desired reduction in friction. Brush application is only used for small repair jobs.

Beschichtungsstoffe - Reibungsreduzierende Beschichtungen für das Innere von Stahlrohrleitungen im On- und Offshore-Bereich für nicht korrosive Gase (ISO 15741:2016)

Peintures et vernis – Revêtements réduisant le frottement pour l'intérieur de gazoducs en acier enterrés et immergés pour le transport de gaz non corrosifs (ISO 15741:2016)

Barve in laki - Premazi za zmanjšanje trenja v notranjosti jeklenih cevovodov na kopnem in na morju za nekorozivne pline (ISO 15741:2016)

General Information

Status
Published
Public Enquiry End Date
02-Nov-2020
Publication Date
02-Mar-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Feb-2021
Due Date
02-May-2021
Completion Date
03-Mar-2021

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SLOVENSKI STANDARD
SIST EN ISO 15741:2021
01-april-2021
Barve in laki - Premazi za zmanjšanje trenja v notranjosti jeklenih cevovodov na
kopnem in na morju za nekorozivne pline (ISO 15741:2016)

Paints and varnishes - Friction-reduction coatings for the interior of on- and offshore

steel pipelines for non-corrosive gases (ISO 15741:2016)
Beschichtungsstoffe - Reibungsreduzierende Beschichtungen für das Innere von
Stahlrohrleitungen im On- und Offshore-Bereich für nicht korrosive Gase (ISO
15741:2016)

Peintures et vernis Revêtements réduisant le frottement pour l'intérieur de gazoducs en

acier enterrés et immergés pour le transport de gaz non corrosifs (ISO 15741:2016)

Ta slovenski standard je istoveten z: EN ISO 15741:2021
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 15741:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 15741:2021
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SIST EN ISO 15741:2021
EN ISO 15741
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 87.020
English Version
Paints and varnishes - Friction-reduction coatings for the
interior of on- and offshore steel pipelines for non-
corrosive gases (ISO 15741:2016)

Peintures et vernis - Revêtements réduisant le Beschichtungsstoffe - Reibungsreduzierende

frottement pour l'intérieur de gazoducs en acier Beschichtungen für das Innere von Stahlrohrleitungen

enterrés et immergés pour le transport de gaz non im On- und Offshore-Bereich für nicht korrosive Gase

corrosifs (ISO 15741:2016) (ISO 15741:2016)
This European Standard was approved by CEN on 18 January 2021.

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, 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15741:2021 E

worldwide for CEN national Members.
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SIST EN ISO 15741:2021
EN ISO 15741:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 15741:2021
EN ISO 15741:2021 (E)
European foreword

The text of ISO 15741:2016 has been prepared by Technical Committee ISO/TC 35 "Paints and

varnishes” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 15741:2021 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of

which is held by DIN.

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 August 2021, and conflicting national standards shall

be withdrawn at the latest by August 2021.

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.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 15741:2016 has been approved by CEN as EN ISO 15741:2021 without any modification.

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SIST EN ISO 15741:2021
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SIST EN ISO 15741:2021
INTERNATIONAL ISO
STANDARD 15741
Second edition
2016-11-15
Paints and varnishes — Friction-
reduction coatings for the interior of
on- and offshore steel pipelines for
non-corrosive gases
Peintures et vernis — Revêtements réduisant le frottement pour
l’intérieur de gazoducs en acier enterrés et immergés pour le
transport de gaz non corrosifs
Reference number
ISO 15741:2016(E)
ISO 2016
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SIST EN ISO 15741:2021
ISO 15741:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, 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

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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 15741:2021
ISO 15741:2016(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Coating material .................................................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Particular requirements for qualification of the coating material ............................................................. 3

4.2.1 General...................................................................................................................................................................................... 3

4.2.2 Non-volatile matter (by mass) ............................................................................................................................. 3

4.2.3 Non-volatile matter (by volume) ....................................................................................................................... 3

4.2.4 Viscosity .................................................................................................................................................................................. 3

4.2.5 Density ...................................................................................................................................................................................... 3

4.2.6 Ash (residue on ignition) .......................................................................................................................................... 3

4.2.7 Pot life........................................................................................................................................................................................ 4

4.2.8 Infrared spectrograms ................................................................................................................................................ 4

4.2.9 Appearance ........................................................................................................................................................................... 4

4.3 Particular requirements for qualification of the cured paint film .............................................................. 4

4.3.1 Preparation of test panels ........................................................................................................................................ 4

4.3.2 Conditioning of test panels ..................................................................................................................................... 4

4.3.3 Dry film thickness ........................................................................................................................................................... 5

4.3.4 Adhesion ................................................................................................................................................................................. 5

4.3.5 Buchholz hardness ........................................................................................................................................................ 5

4.3.6 Resistance to neutral salt spray .......................................................................................................................... 5

4.3.7 Resistance to artificial ageing ............................................................................................................................... 5

4.3.8 Bend test (conical mandrel) ................................................................................................................................... 5

4.3.9 Resistance to gas pressure variations............................................................................................................ 5

4.3.10 Resistance to water immersion ........................................................................................................................... 6

4.3.11 Resistance to chemicals ............................................................................................................................................. 6

4.3.12 Resistance to hydraulic blistering ..................................................................................................................... 6

4.4 Packaging, labelling and storing .............................................................................................................................................. 6

4.5 Quality assurance.................................................................................................................................................................................. 6

4.6 Product data sheet ............................................................................................................................................................................... 6

4.7 Qualification certificate ................................................................................................................................................................... 7

4.8 Batch test certificate ........................................................................................................................................................................... 8

5 Application of the coating material .................................................................................................................................................. 9

5.1 General ........................................................................................................................................................................................................... 9

5.2 Surface preparation .........................................................................................................................................................................10

5.3 Paint preparation ...............................................................................................................................................................................10

5.4 Paint application .................................................................................................................................................................................10

6 Production control ..........................................................................................................................................................................................11

6.1 Assessment of the coating on the pipes .........................................................................................................................11

6.1.1 Appearance ........................................................................................................................................................................11

6.1.2 Dry film thickness ........................................................................................................................................................11

6.2 Assessment of the coating on steel panels ...................................................................................................................11

6.2.1 Preparation of test panels .....................................................................................................................................11

6.2.2 Adhesion ..............................................................................................................................................................................11

6.2.3 Buchholz hardness ......................................................................................................................................................11

6.2.4 Bend test ..............................................................................................................................................................................11

6.2.5 Curing test ..........................................................................................................................................................................11

6.2.6 Porosity test ......................................................................................................................................................................11

7 Repairs .........................................................................................................................................................................................................................12

© ISO 2016 – All rights reserved iii
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SIST EN ISO 15741:2021
ISO 15741:2016(E)

8 Handling, transportation and storage.........................................................................................................................................12

8.1 Handling.....................................................................................................................................................................................................12

8.2 Transportation to the storage area .....................................................................................................................................12

8.3 Storage ........................................................................................................................................................................................................12

8.4 Loading coated pipes for transportation .......................................................................................................................12

Annex A (normative) Determination of ash (refer to 4.2.5) ......................................................................................................13

Annex B (normative) Dry film thickness (refer to 6.1.2) ..............................................................................................................14

Annex C (normative) Resistance to gas pressure variations (refer to 4.3.9) ...........................................................15

Annex D (normative) Hydraulic-pressure blistering (refer to 4.3.12) ...........................................................................18

Annex E (normative) Porosity of a film of the coating material on a glass panel (refer to 6.2.6) ......20

Annex F (normative) Curing test (refer to 6.2.5) ..................................................................................................................................21

Annex G (normative) Wet-sponge test (refer to 6.2.6) ....................................................................................................................22

Bibliography .............................................................................................................................................................................................................................23

iv © ISO 2016 – All rights reserved
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SIST EN ISO 15741:2021
ISO 15741:2016(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 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.

The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 14,

Protective paint systems for steel structures.

This second edition cancels and replaces the first edition (ISO 15741:2001), which has been technically

revised.
© ISO 2016 – All rights reserved v
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SIST EN ISO 15741:2021
ISO 15741:2016(E)
Introduction

Internal coating of pipelines is used to reduce friction and improve the flow conditions when conveying

non-corrosive gases, and to offer sufficient corrosion protection during storage and transport of the

pipes. The reduction in friction depends on various parameters like the pressure and temperature of

the gas, and the diameter of the pipe. Therefore, it is not possible to give a single figure for this reduction

in friction.

In order to establish sufficient corrosion protection and to ensure optimum performance of the internal

coating in the steel pipes, it is necessary for owners of pipelines, planners, consultants, companies

carrying out the work, inspectors of protective coatings and manufacturers of coating materials to have

at their disposal state-of-the-art information in concise form including requirements for the coating.

Such information has to be as complete as possible, unambiguous and easily understandable to avoid

difficulties and misunderstandings between the parties concerned.
vi © ISO 2016 – All rights reserved
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SIST EN ISO 15741:2021
INTERNATIONAL STANDARD ISO 15741:2016(E)
Paints and varnishes — Friction-reduction coatings for
the interior of on- and offshore steel pipelines for non-
corrosive gases
1 Scope

This document specifies requirements and methods of test for liquid epoxy paints and internal coatings

of such paints in steel pipes and fittings for the conveyance of non-corrosive gas. It also deals with the

application of the paint. Other paints or paint systems are not excluded provided they comply with the

requirements given in this document. The coating consists of one layer, which is normally shop-applied

on blast-cleaned steel by airless spray or other suitable spraying techniques. The applied and cured

paint film must be smooth to give the desired reduction in friction. Brush application is only used for

small repair jobs.
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 2409, Paints and varnishes — Cross-cut test
ISO 2811 (all parts), Paints and varnishes — Determination of density

ISO 2812-1:2007, Paints and varnishes — Determination of resistance to liquids — Part 1: Immersion in

liquids other than water

ISO 2812-2, Paints and varnishes — Determination of resistance to liquids — Part 2: Water immersion method

ISO 2815, Paints and varnishes — Buchholz indentation test

ISO 3233-1, Paints and varnishes — Determination of the percentage volume of non-volatile matter —

Part 1: Method using a coated test panel to determine non-volatile matter and to determine dry film density

by the Archimedes principle

ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content

ISO 6743-4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H

(Hydraulic systems)
ISO 6860, Paints and varnishes — Bend test (conical mandrel)

ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual

assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates

and of steel substrates after overall removal of previous coatings

ISO 8503-1, Preparation of steel substrates before application of paints and related products — Surface

roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO

surface profile comparators for the assessment of abrasive blast-cleaned surfaces

ISO 8503-2, Preparation of steel substrates before application of paints and related products — Surface

roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface

profile of abrasive blast-cleaned steel — Comparator procedure
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
© ISO 2016 – All rights reserved 1
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SIST EN ISO 15741:2021
ISO 15741:2016(E)

ISO 19840:2012, Paints and varnishes — Corrosion protection of steel structures by protective paint

systems — Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
coater

company which is responsible for application of the coating material in accordance with the provisions

of this document
3.2
coating material manufacturer
supplier of the coating material
3.3
dry film thickness
DFT

thickness of a coating remaining on the surface when the coating has hardened/cured

[SOURCE: ISO 12944-5:2007, 3.10]
3.4
natural gas

complex gaseous mixture of hydrocarbons, primarily methane, but generally also including ethane,

propane and higher hydrocarbons in much smaller amounts and some non-combustible gases, such as

nitrogen and carbon dioxide
[SOURCE: ISO 14532:2014, 2.1.1.1]
3.5
nominal dry film thickness
NDFT
dry film thickness specified for each coat or for the whole paint system
[SOURCE: ISO 12944-5:2007, 3.11]
3.6
pinhole

film defect characterized by small pore-like flaws in a coating which extend entirely through the

applied film and have the general appearance of pinpricks when viewed by reflected light

3.7
purchaser
organization or individual that buys the coated pipes and fittings
4 Coating material
4.1 General

The coating material shall typically be a two-pack epoxy paint. It shall not contain any substances which

will be released from the paint film after it has cured and are proven to be detrimental to the operation

of the pipeline and the quality of the gas.
2 © ISO 2016 – All rights reserved
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SIST EN ISO 15741:2021
ISO 15741:2016(E)

Unless otherwise agreed, the coating material shall be qualified in accordance with 4.2 and 4.3 and

shall not be changed after qualification.

The manufacturer of the coating material shall provide on request infrared spectrograms of the base

component and the curing agent component (see 4.2.8).

In addition, the manufacturer shall provide a product data sheet (see 4.6), a health and safety data sheet

and a certificate stating the test results obtained in accordance with 4.2 and 4.3, respectively, and, if

applicable, deviating test conditions.

The manufacturer shall also provide with every batch of the coating material a batch test certificate

stating the information as given in 4.8.

Unless otherwise agreed, the applied coating shall provide corrosion protection during storage and

transport for a minimum period of one year without significant breakdown of the coating.

The typical operating-temperature range for this type of coating is between −20 °C and 110 °C.

Where, subsequently, external coatings have to be applied, care shall be taken not to allow the internal

coating to be damaged by the elevated temperatures which may occur.
4.2 Particular requirements for qualification of the coating material
4.2.1 General

The following subclauses describe the laboratory test methods which are required for qualification of

the coating material.
4.2.2 Non-volatile matter (by mass)

When determined in accordance with ISO 3251, the non-volatile matter (by mass) of the coating

material shall comply with the value specified by the coating material manufacturer in the qualification

certificate (Table 2).
4.2.3 Non-volatile matter (by volume)

When determined in accordance with ISO 3233-1, the non-volatile matter (by volume) of the coating

material shall comply with the value specified by the coating material manufacturer in the product

data sheet (Table 1).
4.2.4 Viscosity

When determined by the method specified by the manufacturer, the viscosity of the ready-mixed

coating material shall comply with the value specified by the coating material manufacturer in the

qualification certificate (Table 2).
4.2.5 Density

When determined in accordance with one of the parts of the ISO 2811 series, the density of the coating

material shall comply with the value specified by the coating material manufacturer in the product

data sheet (Table 1).
4.2.6 Ash (residue on ignition)

When determined in accordance with the method described in Annex A, the ash (residue on ignition) of

the coating material shall comply with the value specified by the coating material manufacturer in the

qualification certificate (Table 2).
© ISO 2016 – All rights reser
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