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1、BRITISH STANDARD BS EN ISO 12944-3:1998 Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 3: Design considerations The European Standard EN ISO 12944-3:1998 has the status of a British Standard ICS 87.020; 91.080.10 BS EN ISO 12944-3:1998 This British Sta
2、ndard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 November 1998 BSI 05-1999 ISBN 0 580 30346 2 National foreword This British Standard is the English language v
3、ersion of EN ISO 12944-3:1998. It is identical with ISO 12944-3:1998. Together with the other seven parts of BS EN 12944, it partially supersedes BS 5493:1977 which is declared obsolescent. The UK participation in its preparation was entrusted to Technical Committee STI/27, Paint systems for metalli
4、c substrates, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments a
5、nd promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications wit
6、h their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facilit
7、y of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligatio
8、ns. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments
9、incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments BS EN ISO 12944-3:1998 BSI 05-1999i Contents Page National forewordInside front cover Foreword2 Forewordiii Text of ISO 12944-31 ii blank EUROPEAN STANDARD
10、NORME EUROPENNE EUROPISCHE NORM EN ISO 12944-3 May 1998 ICS 87.020; 91.080.10 Descriptors: See ISO document English version Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 3: Design considerations (ISO 12944-3:1998) Peintures et vernis Anticorrosion des
11、 structures en acier par systmes de peinture Partie 3: Conception et dispositions constructives (ISO 12944-3:1998) Beschichtungsstoffe Korrosionsschutz von Stahlbauten durch Beschichtungssysteme Teil 3: Grundregeln zur Gestaltung (ISO 12944-3:1998) This European Standard was approved by CEN on 13 No
12、vember 1997. 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
13、obtained on application to the Central Secretariat 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 Central
14、Secretariat has the same status as the official 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, Switzerland and United Kingdom. C
15、EN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12944-3:1998
16、E EN ISO 12944-3:1998 BSI 05-1999 2 Foreword The text of the International Standard ISO 12944-3:1998 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 Eu
17、ropean 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 withdrawn at the latest by November 1998. According to the CEN/CENELEC Internal Regulations, the
18、 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, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingd
19、om. Endorsement notice The text of the International Standard ISO 12944-3:1998 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). EN ISO 12944-3:1998 ii BSI 05-1999 Contents Page Forewordiii Int
20、roduction1 1Scope1 2Normative references1 3Definition2 4General2 5Basic design criteria for corrosion protection purposes2 5.1Accessibility2 5.2Treatment of gaps3 5.3Precautions to prevent retention of deposits and water3 5.4Edges3 5.5Welding surface imperfections3 5.6Bolted connections3 5.7Box memb
21、ers and hollow components3 5.8Notches3 5.9Stiffeners4 5.10 Prevention of galvanic corrosion4 5.11 Handling, transport and erection4 Annex A (informative) Accessibility Typical distances required for tools in corrosion protection work5 Annex B (informative) Recommended minimum dimensions of openings
22、for access to confined areas6 Annex C (informative) Minimum dimensions for narrow spaces between surfaces7 Annex D (informative) Design features which may be used to avoid deposits accumulating or water being trapped9 Annex ZA (normative) Normative references to international publications with their
23、 relevant European publicationsInside back cover Figure A.15 Figure B.16 Figure C.17 Figure C.28 Figure D.1 Avoidance of dirt and water traps9 Figure D.2 Design of welds9 Figure D.3 Treatment of gaps10 Figure D.4 Composite steel/concrete structure10 Figure D.5 Avoidance of sharp edges11 Figure D.6 A
24、voidance of welding surface imperfections11 Figure D.7 Stiffener design recommended for corrosion protection12 Descriptor: Paints, varnishes, steel construction, corrosion, corrosion prevention, protective coatings, paint coats, design. EN ISO 12944-3 :1998 BSI 05-1999iii Foreword ISO (the Internati
25、onal 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 bee
26、n 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 stand
27、ardization. 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
28、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: Ge
29、neral 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 specific
30、ations for new work and maintenance. Annex A to Annex D of this part of ISO 12944 are for information only. iv blank EN ISO 12944-3:1998 BSI 05-19991 Introduction Unprotected steel in the atmosphere, in water and in soil is subjected to corrosion that may lead to damage. Therefore, to avoid corrosio
31、n 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 feat
32、ures 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, planner
33、s, 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 possib
34、le, 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
35、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 cont
36、ractual 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
37、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
38、guidance on how to minimize the risk of corrosion by appropriate design measures for steel structures to be coated by protective paint systems. 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 p
39、remature 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 stru
40、ctures 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 a
41、greements 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. ISO 1461:, Hot dip galvanized coatings on fabricated fe
42、rrous products Specifications1). 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 previo
43、us 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. I
44、SO 12944-5:1998, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 5: Protective paint systems. ISO 14713:, Protection against corrosion of iron and steel in structures Guidelines2). 1) To be published. (Revision of ISO 1459:1973 and ISO 1461:1973) 2) To
45、be published. EN ISO 12944-3:1998 2 BSI 05-1999 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, conside
46、ring corrosion protection 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 facilit
47、ate 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
48、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. T
49、he 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
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