EN 12954:2019
(Main)General principles of cathodic protection of buried or immersed onshore metallic structures
General principles of cathodic protection of buried or immersed onshore metallic structures
This document describes the general principles for the implementation and management of a system of cathodic protection against corrosive attacks on structures which are buried or in contact with soils, surface fresh waters or underground waters, with and without the interference of external electrical sources. It specifies the protection criteria to be achieved to demonstrate the cathodic protection effectiveness.
For structures that cannot be electrically isolated from neighbouring influencing structures, it may be impossible to use the criteria defined in the present document. In this case, EN 14505 will be applied (see 9.4 "Electrical continuity/discontinuity").
To assist in forming a decision whether or not to apply cathodic protection the corrosion likelihood can be evaluated using Annex A. Annex A summarizes the requirements of EN 12501-1 [2] and EN 12501-2 [3].
Cathodic protection of structures immersed in seawater is covered by EN 12473 and a series of standards more specific for various applications.
Cathodic protection for reinforced concrete structures is covered by EN ISO 12696.
This document is applicable in conjunction with:
- EN ISO 15589-1 for application for buried or immersed cathodically pipelines,
- EN 50162 to manage d.c. stray currents,
- EN ISO 18086 to manage corrosion due to a.c. interference from high voltage power sources and a.c. traction systems,
- EN 13509 for cathodic protection measurement techniques
- EN 50443 to manage protection for touch and step voltage.
Grundlagen des kathodischen Korrosionsschutzes von metallenen Anlagen in Böden und Wässern
Dieses Dokument beschreibt die allgemeinen Grundsätze für die Implementierung und das Management eines Systems zum kathodischen Schutz gegen korrosive Angriffe auf Anlagen, die erdverlegt sind oder sich in Kontakt mit Böden, Oberflächensüßwasser oder Grundwasser befinden, mit und ohne Beeinflussung durch Fremdströme. Es legt die zum Nachweis der Wirksamkeit des kathodischen Korrosionsschutzes einzuhaltenden Schutzkriterien fest.
Bei Anlagen, die nicht elektrisch von benachbarten beeinflussenden Anlagen getrennt werden können, können die in dem vorliegenden Dokument festgelegten Kriterien möglicherweise nicht angewendet werden. In diesem Fall wird EN 14505 angewendet (siehe 9.4 „Elektrische Längsleitfähigkeit/elektrische Trennung“).
ANMERKUNG Zur Erleichterung der Entscheidung für oder gegen die Anwendung eines kathodischen Korrosionsschutzes kann die Korrosionswahrscheinlichkeit mithilfe des informativen Anhangs A beurteilt werden, worin die Anforderungen von EN 12501 1 [2] und EN 12501 2 [3] zusammengefasst sind.
Der kathodische Korrosionsschutz von Anlagen in Meerwasser oder Brackwasser wird in EN 12473 sowie einer Reihe spezifischerer Normen für unterschiedliche Anwendungen behandelt.
Der kathodische Korrosionsschutz für Anlagen aus Stahlbeton wird in EN ISO 12696 behandelt.
Dieses Dokument ist anwendbar in Verbindung mit:
- EN ISO 15589 1 zur Anwendung für kathodisch korrosionsgeschützte Rohrleitungen in Böden und Wässern;
- EN 50162 zur Steuerung von Gleichstromsteuströmen;
- EN ISO 18086 zum Schutz vor Korrosion aufgrund von Wechselspannungsbeeinflussung durch Hochspannungsquellen und durch mit Wechselstrom betriebene Bahnanlagen;
- EN 13509 zu Messverfahren für den kathodischen Korrosionsschutz;
- EN 50443 zum Schutz vor Berührungs und Schrittspannung.
Principes généraux de la protection cathodique des structures métalliques à terre enterrées ou immergées
Le présent document décrit les principes généraux qui gouvernent la mise en œuvre et la gestion d'un système de protection cathodique afin de protéger contre la corrosion les structures qui sont enterrées ou en contact avec des sols, des eaux douces de surface ou des eaux souterraines, qu'elles subissent ou non l'influence de sources électriques extérieures. Il spécifie les critères de protection à atteindre pour démontrer l'efficacité de la protection cathodique.
Pour les structures qui ne peuvent pas être isolées électriquement par rapport à des structures avoisinantes exerçant une influence, l'utilisation des critères définis dans le présent document peut s'avérer impossible. Dans ce cas, l'EN 14505 sera appliquée (voir 9.4, « Continuité/discontinuité électrique »).
NOTE Pour aider à la prise de décision quant à la pertinence ou non d'appliquer une protection cathodique, le risque de corrosion peut être évalué en utilisant l'Annexe A, informative, qui présente une synthèse des exigences de l’EN 12501 1 [2] et de l’EN 12501 2 [3].
La protection cathodique des structures immergées en eau de mer ou en eaux saumâtres est couverte par l'EN 12473 et par une série de normes plus spécifiques concernant diverses applications.
La protection cathodique des structures en béton armé est couverte par l'EN ISO 12696.
Le présent document s'applique conjointement avec :
— l’EN ISO 15589 1, qui s'applique aux conduites enterrées ou immergées protégées par voie cathodique,
— l'EN 50162 pour la gestion des courants vagabonds des systèmes à courant continu,
— l'EN ISO 18086 pour la gestion de la corrosion occasionnée par l'influence des lignes électriques haute tension en courant alternatif et des systèmes de traction à courant alternatif,
— l’EN 13509 pour les techniques de mesures applicables en protection cathodique,
— l’EN 50443 pour la gestion de la protection contre les tensions de toucher et de pas.
Splošna načela katodne zaščite vkopanih ali potopljenih kovinskih konstrukcij
Ta evropski standard določa splošna načela za uvedbo sistema katodne zaščite vkopanih ali potopljenih kovinskih konstrukcij pred korozijo z vplivom zunanjih električnih virov ali brez njih.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2020
Nadomešča:
SIST EN 12954:2003
Splošna načela katodne zaščite vkopanih ali potopljenih kovinskih konstrukcij
General principles of cathodic protection of buried or immersed onshore metallic
structures
Grundlagen des kathodischen Korrosionsschutzes von metallenen Anlagen in Böden
und Wässern
Principes généraux de la protection cathodique des structures métalliques à terre
enterrées ou immergées
Ta slovenski standard je istoveten z: EN 12954:2019
ICS:
25.220.40 Kovinske prevleke Metallic coatings
91.080.10 Kovinske konstrukcije Metal structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12954
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 23.040.99; 77.060 Supersedes EN 12954:2001
English Version
General principles of cathodic protection of buried or
immersed onshore metallic structures
Principes généraux de la protection cathodique des Grundlagen des kathodischen Korrosionsschutzes von
structures métalliques à terre enterrées ou immergées metallenen Anlagen in Böden und Wässern
This European Standard was approved by CEN on 28 July 2019.
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 obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12954:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Abbreviations and symbols . 13
5 Cathodic protection personnel competence . 13
6 Principles and criteria of cathodic protection . 14
6.1 Principles of cathodic protection . 14
6.2 Cathodic protection criteria . 14
Table 1 — Free corrosion potentials, protection potentials and limiting critical potentials of
common metallic materials in soils and waters (except seawater and brackish
water) measured against CSE . 15
6.3 Alternative method . 16
6.3.1 100 mV cathodic potential shift . 16
6.3.2 Other methods . 17
6.4 Criteria in presence of a.c . 17
7 Prerequisites for application of cathodic protection . 17
7.1 General . 17
7.2 Electrical continuity . 17
7.3 Electrical isolation . 17
7.4 External coating . 18
8 Useful data and design considerations . 18
8.1 General . 18
8.2 Structure details . 19
8.3 Service conditions . 19
9 Design . 20
9.1 General . 20
9.2 Design lifetime . 20
9.3 Adjacent structures and external electrical sources . 20
9.4 Electrical continuity/discontinuity . 20
9.5 Protective coatings . 21
9.6 Current demand . 21
9.7 Galvanic anode systems . 22
9.7.1 General considerations . 22
9.7.2 Utilization of galvanic anode systems. 22
9.7.3 Design of a galvanic anode system . 22
9.7.4 Technical considerations and data for the design of a galvanic protection system . 23
Table 2 — Typical chemical compositions of the alloys used for zinc anodes . 24
Table 3 — Typical electrochemical parameters for zinc anodes used in soils. 25
Table 4 — Typical chemical compositions of the alloys used for magnesium anodes . 25
Table 5 — Typical electrochemical parameters for magnesium anodes used in soils . 26
Figure 1 — Current capacity of magnesium alloy versus current density [9] . 27
9.8 A.C. and/or d.c. decoupling devices . 28
9.9 Impressed current cathodic protection (ICCP) system . 28
9.10 Monitoring . 29
9.11 Cable . 29
9.12 Impressed current groundbeds . 30
10 Installation of cathodic protection systems . 31
11 Commissioning . 31
11.1 General . 31
11.2 Preliminary checking . 31
11.3 Start-up . 32
11.4 Assessment of the cathodic protection effectiveness . 32
11.5 Documentations . 33
12 Monitoring, inspection and maintenance . 33
12.1 General . 33
12.2 Monitoring . 34
12.3 Inspection . 35
12.4 Maintenance . 35
Annex A (informative) Corrosion likelihood in soils . 36
Annex B (informative) Reduction of the corrosion rate by using a 100 mV cathodic
polarization — 100 mV cathodic potential shift . 38
B.1 Measurement method during polarization . 38
Figure B.1 — Polarization formation method . 38
B.2 Measurement method during depolarization . 39
Figure B.2 — Polarization decay method . 39
Bibliography . 40
European foreword
This document (EN 12954:2019) has been prepared by Technical Committee CEN/TC 219 “Cathodic
protection”, 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 February 2020, and conflicting national standards shall
be withdrawn at the latest by February 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12954:2001.
This document describes general principles for applying external cathodic protection on onshore metallic
structures in contact with soils, fresh surface waters or underground waters, except those which are
embedded in concrete and those which are in sea-waters or brackish waters.
This edition of EN 12954 does not cover specific applications for on-land pipelines.
NOTE On-land pipeline applications is now completely covered by EN ISO 15589-1 [1].
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
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