EN ISO 12944-3:1998
(Main)Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (ISO 12944-3:1998)
Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (ISO 12944-3:1998)
Migrated from Progress Sheet (TC Comment) (2000-07-10): !!! prEN ISO 12944-1 to -8 are a package: DOW = 1997-12-31 !!! (BT C 95/1996)
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme - Teil 3: Grundregeln zur Gestaltung (ISO 12944-3:1998)
Dieser Teil von ISO 12944 behandelt Grundregeln zur Gestaltung von mit Beschichtungssystemen zu versehenden Stahlbauten, um vorzeitige Korrosion und Schäden der Beschichtung oder des Bauwerks zu vermeiden. Die Norm gibt Beispiele für geeignetes und ungeeignetes Gestalten und zeigt, wie Schwierigkeiten beim Auftragen, beim Überwachen und beim Instandsetzen von Beschichtungssystemen 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 12944-3:1998)
La présente partie de l'ISO 12944 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. Elle 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. Elle examine également les dispositions qui facilitent la manutention et le transport des structures en acier.
Barve in laki - Korozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi sistemi - 3. del: Upoštevanje vrste in načina oblikovanja konstrukcije (ISO 12944-3:1998)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-1998
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VLVWHPLGHO 8SRãWHYDQMHYUVWHLQQDþLQDREOLNRYDQMDNRQVWUXNFLMH ,62
Paints and varnishes - Corrosion protection of steel structures by protective paint
systems - Part 3: Design considerations (ISO 12944-3:1998)
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -
Teil 3: Grundregeln zur Gestaltung (ISO 12944-3:1998)
Peintures et vernis - Anticorrosion des structures en acier par systemes de peinture -
Partie 3: Conception et dispositions constructives (ISO 12944-3:1998)
Ta slovenski standard je istoveten z: EN ISO 12944-3:1998
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.
INTERNATIONAL ISO
STANDARD 12944-3
First edition
1998-05-15
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
A
Reference number
ISO 12944-3:1998(E)
ISO 12944-3:1998(E)
CONTENTS Page
1 Scope.1
2 Normative references .1
3 Definition.1
4 General.2
5 Basic design criteria for corrosion protection purposes.2
5.1 Accessibility .2
5.2 Treatment of gaps.3
5.3 Precautions to prevent retention of deposits and water .3
5.4 Edges.3
5.5 Welding surface imperfections.3
5.6 Bolted connections .3
5.7 Box members and hollow components.4
5.8 Notches.4
5.9 Stiffeners.4
5.10 Prevention of galvanic corrosion .4
5.11 Handling, transport and erection.5
Annex A Accessibility - Typical distances required for tools in corrosion protection work.6
Annex B Recommended minimum dimensions of openings for access to confined areas .7
Annex C Minimum dimensions for narrow spaces between surfaces .8
Annex D Design features which may be used to avoid deposits accumulating or water being trapped .10
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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ISO
ISO 12944-3:1998(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 though ISO Technical
Committees. Each member body interested in the 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.
Draft International Standards adopted by the Technical Committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote.
International Standard ISO 12944-3 was prepared by Technical Committee ISO/TC 35, Paints and varnishes,
Subcommittee SC 14, Corrosion protection of steel structures by protective paint systems.
ISO 12944 consists of the following parts under the general title Paints and varnishes – Corrosion protection of steel
structures by protective paint systems:
– Part 1: General introduction
– Part 2: Classification of environments
– Part 3: Design considerations
– Part 4: Types of surface and surface preparation
– Part 5: Protective paint systems
– Part 6: Laboratory performance test methods
– Part 7: Execution and supervision of paint work
– Part 8: Development of specifications for new work and maintenance
Annexes A to D of this part of ISO 12944 are for information only.
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ISO
ISO 12944-3:1998(E)
INTRODUCTION
Unprotected steel in the atmosphere, in water and in soil is subjected to corrosion that may lead to damage.
Therefore, to avoid corrosion damage, steel structures are normally protected to withstand the corrosion stresses
during the service life required of the structure.
There are different ways of protecting steel structures from corrosion. ISO 12944 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, it is necessary for owners of such structures,
planners, consultants, companies carrying out corrosion protection work, inspectors of protective coatings and
manufacturers of coating materials to have at their disposal state-of-the-art information in concise form on corrosion
protection by paint systems. Such information has to be as complete as possible, unambiguous and easily
understandable to avoid difficulties and misunderstandings between the parties concerned with the practical
implementation of protection work.
This International Standard - ISO 12944 - 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 is familiar
with other relevant International Standards, in particular those dealing with surface preparation, as well as relevant
national regulations.
Although ISO 12944 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 this standard may result in serious financial consequences.
ISO 12944-1 defines the overall scope of all parts 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 for a given project.
This part of ISO 12944 gives guidance on how to minimize the risk of corrosion by appropriate design measures for
steel structures to be coated by protective paint systems.
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INTERNATIONAL STANDARD ISO ISO 12944-3:1998(E)
Paints and varnishes — Corrosion protection of steel structures
by protective paint systems —
Part 3:
Design considerations
1 SCOPE
This part of ISO 12944 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 standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 12944. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 12944 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
1)
ISO 1461: - , Hot dip galvanized coatings on fabricated ferrous products - Specifications.
ISO 8501-1:1988, 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 12944-1:1998, Paints and varnishes - Corrosion protection of steel structures by protective paint systems -
Part 1: General introduction.
ISO 12944-2:1998, Paints and varnishes - Corrosion protection of steel structures by protective paint systems -
Part 2: Classification of environments.
ISO 12944-5:1998, Paints and varnishes - Corrosion protection of steel structures by protective paint systems -
Part 5: Protective paint systems.
2)
ISO 14713: - , Protection against corrosion of iron and steel in structures - Guidelines.
3 DEFINITION
For the purposes of this part of ISO 12944, the following definition applies in addition to those given in ISO 12944-1.
3.1 design (noun): The way in which a structure is built up, as represented by a detailed plan of the structure,
considering corrosion protection.
__________
1) To be published. (Revision of ISO 1459:1973 and ISO 1461:1973)
2) To be published.
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ISO
ISO 12944-3:1998(E)
4 GENERAL
The objective of designing a structure is to ensure that the structure is suitable for its function, has adequate
stability, strength and durability, is constructed at an acceptable cost and is aesthetically pleasing.
The overall design shall be planned to facilitate surface preparation, painting, inspection and maintenance.
The shape of a structure can influence its susceptibility to corrosion. Therefore structures should be designed such
that corrosion cannot easily establish a foothold (a corrosion trap) from which it can spread. It is therefore strongly
recommended that the designer consults a corrosion protection expert at a very early stage in the design process.
Ideally, the corrosion protection system should be selected at that time, with due consideration to the type of service
of the structure, its service life and maintenance requirements.
The shapes of the structural elements and the methods used to join them should be such that fabrication, joining
and any subsequent treatment will not promote corrosion. Similarly, consideration should be given to the shape of
the structure and its elements with respect to the category of its environment (see ISO 12944-2) when specifying a
protective paint system.
Designs should be simple and excessive complexity should be avoided. Where steel components are in contact,
embedded or enclosed in other building materials, e.g. brickwork, they are no longer accessible, therefore, the
corrosion protection measures shall be effective throughout the service life of the structure.
Steelwork to be hot-dip galvanized shall be designed in accordance with the requirements of
ISO 1461 and ISO 14713.
5 BASIC DESIGN CRITERIA FOR CORROSION PROTECTION PURPOSES
The surfaces of steel structures exposed to corrosion stresses should be small in extent. The structure should have
the smallest possible number of irregularities (e.g. overlaps, corners, edges). Joints should have preferably been
made by welding, rather than bolting or rivetting, to achieve a smoother overall surface. Discontinous welds and
spot welds should only be used where the corrosion risk is negligible.
5.1 Accessibility
Steel components should be designed to be accessible for the purpose of applying, inspecting and maintaining the
protective paint system. This can be facilitated, for example, by the provision of fixed walkways, powered platforms
or other auxiliary equipment. The accessories which will be required for carrying out maintenance work safely
(e.g. hooks, lugs and anchorages for sca
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