EN 12499:2003
(Main)Internal cathodic protection of metallic structures
Internal cathodic protection of metallic structures
This standard specifies the structures, electrolytes, metals, surfaces which can be protected against corrosion by application of internal cathodic protection - specifies the conditions necessary to the application of internal cathodic protection - give guidances on realisation and operation of an efficient cathodic protection system of specific structures, namely - Domestic water heaters, appliances for heating and storage, feed tank with variable level, filtering tanks, internal surface of wells casing, internal surface of pipes, tubular heat exchangers.
Kathodischer Korrosionsschutz für die Innenflächen von metallischen Anlagen
Diese Europäische Norm legt die Anlagen, die Metalle und Oberflächen, die durch Anwenden des inneren kathodischen Schutzes gegen Korrosion geschützt werden können, die Elektrolytlösungen und die für einen kathodischen Innenschutz erforderlichen Bedingungen fest. Ferner gibt sie Anleitungen für die Installation und für den Betrieb eines wirksamen kathodischen Schutzsystems.
Diese Norm betrifft die Anwendung des inneren kathodischen Schutzes von häuslichen Wassererwärmern, Warm- und Kaltwasserbehältern, Wasserzirkulationsleitungen, Kondensatoren, Wärmetauschern sowie ganz allgemein Anlagen, die eine Elektrolytlösung enthalten, so dass der kathodische Schutz technisch möglich ist. Diese Norm gilt für metallische Anlagen, die gespeichertes oder fließendes Wasser enthalten, das stagnierend oder ausgetauscht sowie kalt oder warm sein kann. Sie gilt für Trinkwasser oder Betriebswässer und selbst für wässrige Suspension.
ANMERKUNG Es wird davon ausgegangen, dass die Elektrolytlösungen eine Leitfähigkeit über 10-3 S m-1 und einen pH Wert über 4,5 haben. Falls der pH-Wert unter 5,5 oder die Leitfähigkeit unter 10-2 S m-1 sinkt, sollten 5.4 und 6.9.2.2 beachtet werden.
Diese Norm gilt für metallische Anlagen, die aus einem Werkstoff oder zusammen mit weiteren Werkstoffen hergestellt sind. Diese Werkstoffe sind:
Eisen und niedriglegierte Stähle;
schmelztauchverzinkter Stahl;
Kupfer und Kupferlegierungen;
Blei;
Zinn;
nichtrostende Stähle;
Aluminium und Zink;
Titan.
Diese Norm gilt sowohl für unbeschichtete Metalle als auch für solche, die bereits mit nieder- oder hochohmigen Beschichtungen versehen sind.
Protection cathodique interne des structures métalliques
La présente Norme européenne spécifie les structures, les métaux et les surfaces susceptibles d'être protégés contre la corrosion par l'application d'une protection cathodique interne, ainsi que les solutions d'électrolytes et les conditions nécessaires pour l'application d'une protection cathodique interne, et donne des indications sur l'application et le fonctionnement d'un système de protection cathodique interne efficace.
La présente norme s'applique à la protection cathodique interne des chauffe-eau domestiques, des réservoirs d'eau chaude et d'eau froide, des canalisations de circulation d'eau, des condensateurs, des échangeurs de chaleur et, de façon générale, de toute structure contenant une solution d'électrolytes qu'il est possible, du point de vue technique, de protéger cathodiquement. La présente norme s'applique aux structures métalliques qui contiennent de l'eau accumulée ou en circulation, dormante ou renouvelée, chaude ou froide, de l'eau potable ou de l'eau industrielle, ainsi que des suspensions aqueuses.
NOTE Les solutions d'électrolytes ont, par hypothèse, une conductivité > 10-3 Siemens m-1, et un pH > 4,5. Lorsque le pH < 5,5 ou lorsque la conductivité est < 10-2 Siemens m-1, voir 5.4 et 6.9.2.2.
La présente norme est applicable aux structures métalliques composées des métaux suivants, isolément ou en combinaison :
fonte et acier faiblement allié ;
acier galvanisé ;
cuivre et alliages de cuivre ;
plomb ;
étain ;
aciers inoxydables ;
aluminium et zinc ;
titane.
La présente norme est applicable à la protection cathodique des métaux non revêtus et des métaux munis de revêtements à résistance d'isolement faible ou élevée.
Notranja katodna zaščita kovinskih konstrukcij
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kathodischer Korrosionsschutz für die Innenflächen von metallischen AnlagenProtection cathodique interne des structures métalliquesInternal cathodic protection of metallic structures91.080.10Kovinske konstrukcijeMetal structures25.220.40Kovinske prevlekeMetallic coatingsICS:Ta slovenski standard je istoveten z:EN 12499:2003SIST EN 12499:2003en01-december-2003SIST EN 12499:2003SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12499January 2003ICS 77.060English versionInternal cathodic protection of metallic structuresProtection cathodique interne des structures métalliquesKathodischer Korrosionsschutz für die Innenflächen vonmetallischen AnlagenThis European Standard was approved by CEN on 7 November 2002.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 Management Centre 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12499:2003 ESIST EN 12499:2003
Test of the electrode potential of galvanic anodes.36Annex B (informative)
Protection potential ranges for low alloy steel compared with Ag/AgClelectrodes in different types of water.38Bibliography.39SIST EN 12499:2003
Terms and definitions3.2.1anaerobicwithout free oxygen in the electrolytic solution adjacent to a metallic structure3.2.2anodic areapart of a structure surface which acts as an anode3.2.3cathodic areapart of a structure surface which acts as a cathodeSIST EN 12499:2003
V)3.2.20IR -free potentialpotential measured without the voltage error caused by the IR drop (EIR FREE)3.2.21isolating jointelectrically discontinuous joint or coupling between two lengths of pipe, inserted in order to provide electricaldiscontinuity between them3.2.22measuring pointpoint at which the actual measurement takes placeNOTEIn the case of structure to electrolytic solution potentials this refers to the location of the reference electrode.3.2.23on potentialstructure to electrolytic solution potential measured with the structure cathodic protection current flowing3.2.24overprotectionstate in which the structure to electrolytic solution potentials are more negative than those recommended forsatisfactory cathodic protectionNOTEOverprotection provides no useful function and can cause damage to the structure by excessive production of gaseswhich can constitute an explosion hazard, embrittlement of metals, or protective coating damage.3.2.25permanent anodesimpressed current anodes for which the rate of corrosion is much smaller than the rate calculated in accordancewith Faraday’s Law3.2.26permanent reference electrodepermanent installed reference electrode designed for a long life3.2.27potential gradientdifference in potential between two separate points in the same electrolytic solutionSIST EN 12499:2003
The current delivered by the generator, the protection current, is controlled by the structure potential measured by areference electrode.3.2.29protected structurestructure to which cathodic protection is effectively applied3.2.30protection current (Ip)current made to flow into a metallic structure from its electrolytic environment in order to effect cathodic protectionof the structure3.2.31resistance bondbond with significant resistance to limit the flow of current to within prescribed limitsNOTEResistance can be achieved by the insertion of resistors into the bond connection.3.2.32soluble anodeimpressed current anode which is consumed in accordance with Faraday’s Law by the impressed anodic currentNOTEThe adjectives soluble and sacrificial used alone do not specify if anodes are working by galvanic action or byimpressed current. To avoid confusion it is proposed to apply the following convention: "galvanic anode" for sacrificial galvanicanode; "soluble anode" for soluble impressed current anode.3.2.33standard reference electrodereference electrode whose potential does not depend on the concentrations of various elements in the electrolyticsolution of the corrosion system3.2.34sensing electrodepermanently installed reference electrode used to measure the structure to electrolytic solutio
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