EN ISO 12944-3:2017

Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (ISO 12944-3:2017)

ISO 12944-3:2017 deals with the basic criteria for the design of steel structures to be coated by protective paint systems in order to avoid premature corrosion and degradation of the coating or the structure. It gives examples of appropriate and inappropriate design, indicating how problems of application, inspection and maintenance of paint systems can be avoided. Design measures which facilitate handling and transport of the steel structures are also considered.

Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme - Teil 3: Grundregeln zur Gestaltung (ISO 12944-3:2017)

In diesem Dokument werden die Grundregeln zur Gestaltung von mit Beschichtungssystemen zu ver-sehenden Stahlbauten festgelegt, um vorzeitige Korrosion und Schäden der Beschichtung oder des Bauwerks zu vermeiden. In der Norm sind Beispiele für geeignetes und ungeeignetes Gestalten gegeben, und es wird gezeigt, wie Schwierigkeiten beim Auftragen, beim Überwachen und beim Instandsetzen von Beschichtungs¬systemen vermieden werden können. Gestaltungsregeln, welche die Handhabung und den Transport von Stahlbauten erleichtern, sind ebenfalls enthalten

Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture - Partie 3: Conception et dispositions constructives (ISO 12944-3:2017)

ISO 12944-3:2017 traite des critères fondamentaux de conception des structures en acier qui doivent être revêtues de systèmes de peinture afin d'éviter la corrosion prématurée et la détérioration du revêtement ou de la structure. Il donne des exemples de bonnes et de mauvaises dispositions, en indiquant comment les problèmes d'application, du contrôle et de l'entretien des systèmes de peinture peuvent être évités. Il examine également les dispositions qui facilitent la manutention et le transport des structures en acier.

Barve in laki - Protikorozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi sistemi - 3. del: Osnovna pravila za načrtovanje konstrukcije (ISO 12944-3:2017)

Ta dokument obravnava osnovna merila glede zasnove jeklenih konstrukcij, ki jih je treba zaščititi z zaščitnimi premaznimi sistemi, da se prepreči prezgodnja korozija in degradacija premaza ali konstrukcije. Podaja primere ustrezne in neustrezne zasnove ter opisuje, kako se je mogoče izogniti težavam pri nanosu, pregledu in vzdrževanju premaznih sistemov. Upoštevani so tudi pogoji zasnove, ki omogočajo lažje upravljanje in prevoz jeklenih konstrukcij.

General Information

• Status: Published
• Publication Date: 19-Dec-2017
• Withdrawal Date: 29-Jun-2018
• ICS: 87.020 - Paint coating processes
• ICS: 91.080.10 - Metal structures
• ICS: 91.080.13 - Steel structures
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-Dec-2017
• Completion Date: 20-Dec-2017
• Ref Project: SIST EN ISO 12944-3:2018 - Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (ISO 12944-3:2017)

Relations

• Replaces: EN ISO 12944-3:1998 - Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (ISO 12944-3:1998)
• Effective Date: 28-Aug-2013

Overview - EN ISO 12944-3:2017 (Design considerations)

EN ISO 12944-3:2017 is Part 3 of the ISO 12944 series on corrosion protection of steel structures by protective paint systems. It defines basic design criteria for steel structures to be coated, with the objective of avoiding premature corrosion and degradation of coatings or the substrate. The standard gives practical examples of appropriate and inappropriate design and explains how to minimize problems during application, inspection and maintenance. It also addresses design measures that facilitate handling, transport and erection.

Key topics and technical requirements

The standard focuses on practical design measures that affect corrosion protection and coating performance, including:

• Accessibility for surface preparation, coating application and inspection (annexes provide typical tool clearance and opening sizes).
• Treatment of gaps and sealed joints to prevent ingress of moisture and contamination; requirements for gap sealing materials are included.
• Prevention of water and deposit retention, with design guidance to avoid troughs, ledges and cavities that trap moisture.
• Surface imperfections - treatment of welds, edges and notches to ensure adequate surface preparation and coating adhesion.
• Bolted connections - detailing for slip-resistant and preloaded connections, and selection/ protection of bolts, nuts and washers to reduce corrosion risk.
• Box members and hollow components - design for adequate access, venting and drainage to enable internal coating and inspection.
• Galvanic corrosion prevention - design advice to avoid dissimilar-metal contact creating galvanic couples.
• Handling, transport and erection - recommendations to reduce damage to coatings and expose fewer vulnerable details during logistics.

Informative annexes provide guidance on minimum dimensions for access openings, narrow spaces and radii, plus examples of design features that avoid water retention.

Practical applications

EN ISO 12944-3 is used to:

• Integrate corrosion-aware design into structural drawings and specifications.
• Reduce lifetime maintenance and coating failures by design.
• Improve safety and quality of surface preparation, coating application and inspection processes.
• Facilitate efficient fabrication, transport and on-site erection with minimal coating damage.

Who should use this standard

• Structural and corrosion engineers
• Design offices and detailers of steelwork
• Fabricators and manufacturers of steel components
• Coating contractors and applicators
• Inspection bodies, specifiers and asset owners
• Procurement and maintenance planners

Related standards

EN ISO 12944-3:2017 is part of the ISO 12944 series and references other standards such as:

• ISO 12944-1, -2, -4, -5 (other parts of the series)
• ISO 8501 (surface cleanliness)
• ISO 1461 (hot-dip galvanizing)

Using EN ISO 12944-3 early in the design process reduces corrosion risk, lowers lifecycle costs and simplifies coating application and maintenance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2018
1DGRPHãþD
SIST EN ISO 12944-3:1998
%DUYHLQODNL3URWLNRUR]LMVND]DãþLWDMHNOHQLKNRQVWUXNFLM]]DãþLWQLPLSUHPD]QLPL
VLVWHPLGHO2VQRYQDSUDYLOD]DQDþUWRYDQMHNRQVWUXNFLMH,62
Paints and varnishes - Corrosion protection of steel structures by protective paint
systems - Part 3: Design considerations (ISO 12944-3:2017)
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -
Teil 3: Grundregeln zur Gestaltung (ISO 12944-3:2017)
Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture -
Partie 3: Conception et dispositions constructives (ISO 12944-3:2017)
Ta slovenski standard je istoveten z: EN ISO 12944-3:2017
ICS:
25.220.20 Površinska obdelava Surface treatment
87.040 Barve in laki Paints and varnishes
91.080.13 Jeklene konstrukcije Steel structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12944-3
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 87.020; 91.080.13 Supersedes EN ISO 12944-3:1998
English Version
Paints and varnishes - Corrosion protection of steel
structures by protective paint systems - Part 3: Design
considerations (ISO 12944-3:2017)
Peintures et vernis - Anticorrosion des structures en Beschichtungsstoffe - Korrosionsschutz von
acier par systèmes de peinture - Partie 3: Conception et Stahlbauten durch Beschichtungssysteme - Teil 3:
dispositions constructives (ISO 12944-3:2017) Grundregeln zur Gestaltung (ISO 12944-3:2017)
This European Standard was approved by CEN on 30 October 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 12944-3:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 12944-3:2017) has been prepared by Technical Committee ISO/TC 35 “Paints
and varnishes” in collaboration with 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 June 2018, and conflicting national standards shall be
withdrawn at the latest by June 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 12944-3:1998.
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 12944-3:2017 has been approved by CEN as EN ISO 12944-3:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 12944-3
Second edition
2017-11
Paints and varnishes — Corrosion
protection of steel structures by
protective paint systems —
Part 3:
Design considerations
Peintures et vernis — Anticorrosion des structures en acier par
systèmes de peinture —
Partie 3: Conception et dispositions constructives
Reference number
ISO 12944-3:2017(E)
©
ISO 2017
ISO 12944-3:2017(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
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
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CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 12944-3:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General . 2
5 Basic design criteria for corrosion protection purposes . 2
5.1 General . 2
5.2 Accessibility . 3
5.3 Treatment of gaps . 3
5.4 Precautions to prevent retention of deposits and water . 3
5.5 Surface imperfections . 4
5.6 Bolted connections . 4
5.6.1 Slip-resistant connections with high-tensile bolts . 4
5.6.2 Preloaded connections . 4
5.6.3 Bolts, nuts and washers . 4
5.7 Box members and hollow components . 4
5.8 Notches . 4
5.9 Stiffeners . 5
5.10 Prevention of galvanic corrosion . 5
5.11 Handling, transport and erection . 5
Annex A (informative) Accessibility — Typical distances required for tools in corrosion
protection work . 6
Annex B (informative) Recommended minimum dimensions of openings for access to
confined areas . 7
Annex C (informative) Minimum dimensions for narrow spaces between surfaces .8
Annex D (informative) Design features which can be used to avoid deposits accumulating
or water being trapped .10
Bibliography .14
ISO 12944-3:2017(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 35, Paints and varnishes, Subcommittee
SC 14, Protective paint systems for steel structures.
This second edition cancels and replaces the first edition (ISO 12944-3:1998), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— the terms and definitions which were not used in the main part of the standard have been deleted;
— the normative references have been updated;
— 5.1 "General" has been added;
— the requirement for gap sealing material has been added in 5.3;
— the requirements for surface preparation in case of high and very high durabilities for C4 and higher,
as well as Im1 to Im4, have been added;
— the title of Table A.1 has been corrected;
— a key has been added to Figure B.1;
— Figure D.1 c) has been deleted;
— the requirements for the radius in Figures D.5 and D.7 have been added;
— a bibliography has been added;
— the text has been editorially revised.
A list of all parts in the ISO 12944 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 12944-3:2017(E)
Introduction
Unprotected steel in the atmosphere, in water and in soil is subjected to corrosion that can lead to
damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand
the corrosion stresses to which they will be subjected during the service life required of the structure.
There are different ways of protecting steel structures from corrosion. ISO 12944 (all parts) deals with
protection by paint systems and covers, in the various parts, all features that are important in achieving
adequate corrosion protection. Additional or other measures are possible but require particular
agreement between the interested parties.
In order to ensure effective corrosion protection of steel structures, owners of such structures, planners,
consultants, companies carrying out corrosion protection work, inspectors of protective coatings
and manufacturers of coating materials need to have at their disposal state-of-the-art information in
concise form on corrosion protection by paint systems. It is vital that such information is as complete as
possible, unambiguous and easily understandable to avoid difficulties and misunderstandings between
the parties concerned with the practical implementation of protection work.
ISO 12944 (all parts) is intended to give this information in the form of a series of instructions.
It is written for those who have some technical knowledge. It is also assumed that the user of
ISO 12944 (all parts) is familiar with other relevant International Standards, in particular those dealing
with surface preparation.
Although ISO 12944 (all parts) does not deal with financial and contractual questions, attention is
drawn to the fact that, because of the considerable implications of inadequate corrosion protection,
non-compliance with requirements and recommendations given in ISO 12944 (all parts) can result in
serious financial consequences.
ISO 12944-1 defines the overall scope of ISO 12944. It gives some basic terms and definitions and a
general introduction to the other parts of ISO 12944. Furthermore, it includes a general statement on
health, safety and environmental protection, and guidelines for using ISO 12944 (all parts) for a given
project.
This document gives guidance on how to minimize the risk of corrosion by appropriate design measures
for steel structures to be coated by protective paint systems.
INTERNATIONAL STANDARD ISO 12944-3:2017(E)
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 3:
Design considerations
1 Scope
This document deals with the basic criteria for the design of steel structures to be coated by protective
paint systems in order to avoid premature corrosion and degradation of the coating or the structure.
It gives examples of appropriate and inappropriate design, indicating how problems of application,
inspection and maintenance of paint systems can be avoided. Design measures which facilitate handling
and transport of the steel structures are also considered.
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 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods
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 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
ISO 12944-1, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —
Part 1: General introduction
ISO 12944-2, Paints and varnishes
...