BS-EN-12502-4-2004.pdf
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1、BRITISH STANDARD BS EN 12502-4:2004 Protection of metallic materials against corrosion Guidance on the assessment of corrosion likelihood in water distribution and storage systems Part 4: Influencing factors for stainless steels The European Standard EN 12502-4:2004 has the status of a British Stand
2、ard ICS 23.040.99; 77.060; 91.140.60 ? BS EN 12502-4:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 19 January 2005 BSI 19 January 2005 ISBN 0 580 45294 8 National foreword This British Standard is the official English language version
3、of EN 12502-4:2004. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British
4、 Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online
5、. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible
6、 international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, th
7、e EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12502-4 December 2004
8、 ICS 77.060; 23.040.99; 91.140.60 English version Protection of metallic materials against corrosion - Guidance on the assessment of corrosion likelihood in water distribution and storage systems - Part 4: Influencing factors for stainless steels Protection des matriaux mtalliques contre la corrosio
9、n - Recommandations pour lvaluation du risque de corrosion dans les installations de distribution et de stockage deau - Partie 4 : Facteurs considrer pour les aciers inoxydables Korrosionsschutz metallischer Werkstoffe - Hinweise zur Abschtzung der Korrosionswahrscheinlichkeit in Wasserverteilungs-
10、und speichersystemen - Teil 4: Einflussfaktoren fr nichtrostende Sthle This European Standard was approved by CEN on 22 November 2004. 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 s
11、tandard without any alteration. Up-to-date lists and bibliographical references concerning such 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, German). A version in any othe
12、r language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fr
13、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUN
14、G Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12502-4:2004: E EN 12502-4:2004 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Terms and
15、 definitions .5 4 Materials .5 5 Types of corrosion.5 5.1 General5 5.2 Pitting corrosion6 5.3 Crevice corrosion 8 5.4 Stress corrosion 9 5.5 Knife-line corrosion.10 5.6 Corrosion fatigue.11 6 Assessment of corrosion likelihood11 Bibliography12 EN 12502-4:2004 (E) 3 Foreword This document (EN 12502-4
16、:2004) has been prepared by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings”, the secretariat of which is held by BSI. 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 20
17、05, and conflicting national standards shall be withdrawn at the latest by June 2005. This standard is in five parts: Part 1: General; Part 2: Influencing factors for copper and copper alloys; Part 3: Influencing factors for hot dip galvanized ferrous materials; Part 4: Influencing factors for stain
18、less steels; Part 5: Influencing factors for cast iron, unalloyed and low alloyed steels. Together these five parts constitute a package of inter-related European Standards with a common date of withdrawal (dow) of 2005-06. According to the CEN/CENELEC Internal Regulations, the national standards or
19、ganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
20、 Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12502-4:2004 (E) 4 Introduction This document mainly results from investigations into and experience gained of the corrosion of stainless steel materials used as tubes, fittings or vessels in drinking water distribution systems in building
21、s. However, it can be applied analogously to other supply water systems. The corrosion resistance of products made of stainless steel immersed in waters exists because of the presence of a very thin passive layer. Stainless steels in water systems are, in general, resistant to corrosion, although th
22、ere are certain conditions under which they can sustain corrosion damage. As a result of the complex interactions between the various influencing factors, the extent of corrosion can only be expressed in terms of likelihood. This document is a guidance document and does not set explicit rules for th
23、e use of stainless steels in water systems. It can be used to minimize the likelihood of corrosion damages occurring by: assisting in designing, installing and operating systems from an anti-corrosion point of view; evaluating the need for additional corrosion protection methods for a new or existin
24、g system; assisting in failure analysis, when failures occur in order to prevent repeat failures occurring. However, a corrosion expert, or at least a person with technical training and experience in the corrosion field, is required to give an accurate assessment of corrosion likelihood or failure a
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