1、 STD-BSI BS EN IS0 127Yq-3-ENGL 1778 1b24bb7 0738275 Obll W BRITISH STANDARD Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations The European Standard EN IS0 129443: 1998 has the status of a British Standard ICs 87.020; 91.080.1
2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 12944-3: 1998 BS EN IS0 129443:1998 been preparec under the direction of the Sector AmdNo. Committee for Materiais and Chemicals, was pubiished under the authority of the Standards Committee and comes into effect on 1
3、5 November 1998 O BSI 1998 ISBN O 680 30346 2 National foreword Date Text affected This British Standard is the English language version of EN IS0 12944-3: 1998. It is identical with IS0 129443 1998. Together with the other seven parts of BS EN 12944, it partially supersedes BS 5493 1977 which is de
4、clared obsolescent. The UK participation in its preparation was enmsted to Technical Committee STi27, Paint systems for metallic substrates, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationallEuropean committee any enquiries on the int
5、erpretation, or proposals for change, and keep the UK interests informed; - monitor ieM ktkx 91.080.10 Descriptors: see IS0 document English version Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations (IS0 12944-3: 1 998) Peintu
6、res et vernis - Antconodm des structures en acier par systmes de peinture - Partie 3: Concepon et dispositions constructives (IS0 12944-3:1998) Beschichtungsstoffe - Kotmsknsschutz von Stahlbauten durch BeschicMungssysteme - Teil 3: Grundregeln zur Gestaltung (Is0 12944-31998) This European Standard
7、 was approved by CEN on 13 November 1997. CEN members are bound to comply with the CENICENELEC Intemal Regulations which stlpulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographicel references concerning suc
8、h national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, Geman). A version in any other language made by transletion under the responsibility of a CEN member into its own language a
9、nd notified to the Central Secretarlat has the same status as the offidal versions. CEN members are the national standards bodies of Austria. Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
10、land and United Kingdom. EUROPEAN COMhflTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secretariak rue de Stassart, 36 Et-1 WO Brurlr O 1998 CEN All rights of exploitation in any form and by any means resewed worldwide for CEN national Members. Ref.
11、No. EN IS0 12944-331998 E - STD-BSI BS EN IS0 12744-3-ENGL 1998 = Lb24bb7 0738278 873 D EN IS0 12944-3:1998 I Corrected 1998-06-18 I Foreword The text of the International Standard IS0 12944-31998 has been prepared by Technical Committee ISOTTC 35 “Paints and varnishes“ in collaboration with Technic
12、al 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 November 1998, and conflicting national standards shall be
13、withdrawn at the latest by November 1998. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, It
14、aly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the Internationai Standard IS0 12944-3:1998 was approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are
15、 listed in annex ZA (normative). - - - - STD.BSI BS EN IS0 12744-3-ENGL 1798 m Lb24bb9 0738277 ?UT m EN IS0 12944-3:1998 INTERNATIONAL STANDARD IS0 12944-3 First edition 1998-05-1 5 Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considera
16、tions Peintures et vernis - Anticorrosion des structures en acier par systmes de peinture - Partie 3: Conception et dispositions constructives Reference number IS0 12944-3:1998(E) . - STD-BSI BS EN IS0 12749-3-ENGL 1778 m lb29bb7 0738280 1121 m EN IS0 12944-3:1998 CONTENTS Page 1 2 3 4 5 5.1 5.2 5.3
17、 5.4 5.5 5.6 5.7 5.0 5.9 Scope 1 Normative references . 1 Definition . 1 General . 2 Basic design criteria for corrosion protection purposes 2 Accessibility 2 Treatment of gaps . 3 Precautions to prevent retention of deposits and water . 3 Edges 3 Welding surface imperfections 3 Bolted connections .
18、 3 - DOX members and hollow components . 4 Notches . 4 Stiff eneTs . 4 5.1 O 5.1 1 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
19、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 Prevention of galvanic corrosion 4 Descriptois: paints . varnishes. steel constniction. corrosion. corrosion prevention. protective coatings.
20、 paint coats. design . ii STD.BS1 BS EN IS0 12744-3-ENGL 1798 Lb24bb 0738283 3b8 EN IS0 12944-3:1998 FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally
21、 carried out though IS0 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 pari in the
22、work, IS0 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 requi
23、res approval by at least 75% of the member bodies casting a vote. International Standard IS0 12944-3 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 14, Conosion protection of steel structures by protective paint systems. IS0 12944 consists of the following parts
24、 under the general title Paints and varnishes - Corrosion protection of steel structures by protective paint systems: - Part 7: General introduction - Part 2: Classification of environments - - Part 3: Design considerations - - Part 4: Types of surface and surface preparation E = - Part 5: Protectiv
25、e paint systems = - Part 7: Execution and supervision of paint work - Part 6: Laboratory performance test methods - I * rn * - Part 8: Development of specifications for new work and maintenance Annexes A to D of this pari of IS0 12944 are for information only. iii INTRODUCTION Unprotected steel in t
26、he 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 str
27、uctures from corrosion. IS0 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 pssible Sut require particular agreement between the interested parties, In order to
28、 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 info
29、rmation 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 Internation
30、al Standard - IS0 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 IS0 12944 is familiar with other relevant International Standards, in particular those dealing with s
31、urface preparation, as well as relevant national regulations. Although IS0 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 rmrmenra!inr
32、?s gke in ?his rtzndard may result in serious financial consequences. IS0 12944-1 defines the overall scope of all parts of IS0 12944. It gives some basic terms and definitions and a general introduction to the other parts of IS0 12944. Furthermore, it includes a general statement on health, safety
33、and environmental protection, and guidelines for using IS0 12944 for a given project. This part of IS0 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. N STD-BSI BS EN IS0 127qY-3-ENGL 1798 = L
34、b24bb7 0738283 130 EN IS0 12944-3:1998 Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 3: Design considerations 1 SCOPE This part of IS0 12944 deals with the basic criteria for the design of steel structures to be coated by protective paint systems
35、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 transpor
36、t 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 IS0 12944. At the time of publication, the editions indicated were valid. All standards are subject to revisio
37、n, and parties to agreements based on this part of IS0 12944 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1461 : -”, 1,. I* IS0 8501 -1 :1
38、988, IS0 1 2944- 1 1 998, IS0 12944-2:1998, IS0 12944-511 998, IS0 1471 3: -2), Hot dip galvanized coatings on fabricated ferrous products - Specifications. Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust gra
39、des and preparation grades of uncaated steel substrates and of steel substrates after overall removal of previous coatings. Paints and varnishes - Corrosion protecrion of steel structures by protective paint systems - Part I: General introduction. Paints and varnishes - Corrosion protection of steel
40、 structures by protective paint systems - Part 2: Classification of environments. Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 5: Protective paint systems. Protection against corrosion of iron and steel in structures - Guidelines. 3 DEFINITION Fo
41、r the purposes of this part of IS0 12944, the following definition applies in addition to those given in IS0 12944-1, 3.1 considering corrosion protection. design (noun): The way in which a structure is built up, as represented by a detailed plan of the structure, 1) To be published. (Revision of IS
42、0 1459:1973 and IS0 1461:1973) 2) To be published. 1 STD.BS1 BS EN IS0 12744-3-ENGL 1798 lbZL(bb7 0738284 077 EN IS0 12944-3:1998 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 constru
43、cted 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 c
44、annot 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
45、 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 sh
46、ould be given to the shape of the structure and its elements with respect to the category of its environment (see IS0 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 i
47、n 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 IS0 1461 and IS0 14713.
48、 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 srralles! pcssible i;u;rker zf irrsgu!ari?ies .g. everlaps, ccmers, edges). Joints should have preferably been made by we
49、lding, 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 anchor
