SIST EN 12502-1:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Korrosionsschutz metallischer Werkstoffe - Hinweise zur Abschätzung der Korrosionswahrscheinlichkeit in Wasserverteilungs- und
speichersystemen - Teil 1: AllgemeinesProtection des matériaux métalliques contre la corrosion - Recommandations pour l'évaluation du risque de corrosion dans les installations de distribution et de stockage d'eau - Partie 1: GénéralitésProtection of metallic materials against corrosion - Guidance on the assessment of corrosion likelihood in water distribution and storage systems - Part 1: General91.140.60Sistemi za oskrbo z vodoWater supply systems77.060Korozija kovinCorrosion of metals23.040.99Drugi sestavni deli za cevovodeOther pipeline componentsICS:Ta slovenski standard je istoveten z:EN 12502-1:2004SIST EN 12502-1:2005en01-marec-2005SIST EN 12502-1:2005SLOVENSKI
STANDARD



SIST EN 12502-1:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12502-1December 2004ICS 77.060; 23.040.99; 91.140.60English versionProtection of metallic materials against corrosion - Guidance onthe assessment of corrosion likelihood in water distribution andstorage systems - Part 1: GeneralProtection des matériaux métalliques contre la corrosion -Recommandations pour l'évaluation du risque de corrosiondans les installations de distribution et de stockage d'eau -Partie 1: GénéralitésKorrosionsschutz metallischer Werkstoffe - Hinweise zurAbschätzung der Korrosionswahrscheinlichkeit inWasserverteilungs- und
speichersystemen - Teil 1:AllgemeinesThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12502-1:2004: ESIST EN 12502-1:2005



EN 12502-1:2004 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.5 3.1 Terms and definitions.5 4 Types of corrosion.6 5 Factors influencing corrosion likelihood.6 5.1 General.6 5.2 Characteristics of the metallic material.7 5.3 Characteristics of the water.7 5.4 Design and construction.8 5.5 Pressure testing and commissioning.9 5.6 Operating conditions.10 6 Assessment of corrosion likelihood.10 Bibliography.11
SIST EN 12502-1:2005



EN 12502-1:2004 (E) 3 Foreword This document (EN 12502-1:2004) 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 2005, 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 stainless 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 organizations 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, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 12502-1:2005



EN 12502-1:2004 (E) 4 Introduction The water distribution and storage systems under consideration consist of a variety of metals and alloys in pipework and in other components, i.e. pumps, valves and heat exchangers. Corrosion on the water-side of these systems generally leads to a build-up of surface corrosion product layers, which, depending on the circumstances, can or cannot be protective. In some cases, corrosion leads to the impairment of the function of the system, i.e. corrosion damage. This impairment can manifest itself in:  perforation (leakage);  blockage of system components;  detrimental changes of water composition.
The type and rate of corrosion for any particular alloy system can depend on:  characteristics of the metallic material;  characteristics of the water;  design and construction;  pressure testing and commissioning;  operating conditions. 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 therefore is a guidance document and does not set explicit rules for the use of metallic materials 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 existing 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 a correct assessment of corrosion likelihood or failure analysis.
SIST EN 12502-1:2005



EN 12502-1:2004 (E) 5 1 Scope This document gives guidance for the assessment of the corrosion likelihood of metallic materials in water distribution and storage systems, as a result of corrosion on the water-side. NOTE This document lists the different types of corrosion and describes in general terms the factors influencing corrosion likelihood. Water distribution and storage systems considered in this document are used for waters intended for human consumption according to EC directive 98/83/EEC and for waters of similar chemical composition. This document does not cover systems that convey the following types of water.  sea water;  brackish water;  geothermal water;  sewage water;  swimming pool water;  open cooling tower water;  recirculating heating and cooling water;  demineralized water. Parts 2 to 5 of this document cover the factors influencing the corrosion likelihood for copper and copper alloys, hot-dip galvanized ferrous materials, stainless steels and cast iron, unalloyed and low alloyed steels in detail. This document does not cover lead. 2 Normative references The following referenced documents are indispensable for the application 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. EN ISO 8044:1999, Corrosion of metals and alloys — Basic terms and definitions (ISO 8044:1999). 3 Terms and definitions 3.1 Terms and definitions For the purposes of this document, the following terms and definitions and those given in EN ISO 8044 apply. 3.1.1 water system system, including every metallic and non-metallic component (e.g. pipes, valves, fittings), constituting the water distribution and storage system, which can be in contac
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