1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 13174:2012Cathodic protection of harbourinstallations (ISO 13174:2012)BS EN ISO 13174:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementati
2、on of EN ISO13174:2012. It supersedes BS EN 13174:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/603, Cathodic protection.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does no
3、t purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 72891 4ICS 47.020.99; 77.060; 93.140Compliance with a British Standard cannot confer immunity
4、 fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13174 December 2012 ICS 77.060; 47.020.99 Supe
5、rsedes EN 13174:2001English Version Cathodic protection of harbour installations (ISO 13174:2012) Protection cathodique des installations portuaires (ISO 13174:2012) Kathodischer Korrosionsschutz fr Hafenbauten (ISO 13174:2012) This European Standard was approved by CEN on 18 December 2012. CEN memb
6、ers 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 applicati
7、on 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 Managem
8、ent 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
9、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Br
10、ussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13174:2012: EBS EN ISO 13174:2012EN ISO 13174:2012 (E) 3 Foreword This document (EN ISO 13174:2012) has been prepared by Technical Committee CEN/TC 219 “Cathodic prote
11、ction“, the secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC 156 “Corrosion of metals and alloys“. 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 2013, a
12、nd conflicting national standards shall be withdrawn at the latest by June 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This
13、document supersedes EN 13174:2001. 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, Former Yugoslav
14、 Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN ISO 13174:2012ISO 13174:2012(E) ISO 2012 All r
15、ights reserved iiiContents PageForeword ivIntroduction v1 Scope . 11.1 General . 11.2 Structures 11.3 Materials . 11.4 Environment . 11.5 Safety and environment protection 22 Normative references 23 Terms and definitions . 24 Competence of personnel 45 Design basis . 55.1 Objectives. 55.2 Cathodic p
16、rotection criteria . 55.3 Design parameters . 65.4 Electrical current demand 75.5 Cathodic protection systems . 95.6 Electrical continuity 115.7 Interactions . 116 Impressed current systems 126.1 Objectives 126.2 Design considerations 126.3 Equipment considerations . 137 Galvanic anode systems 167.1
17、 Objectives167.2 Design 167.3 Materials 167.4 Location of anodes 177.5 Installation . 178 Commissioning, operation and maintenance 188.1 Objectives 188.2 Commissioning: galvanic systems . 188.3 Commissioning: Impressed current systems . 188.4 Operation and maintenance . 199 Documentation 209.1 Objec
18、tives 209.2 Impressed current system . 209.3 Galvanic anodes system 21Annex A (informative) Guidance for current requirements for cathodic protection of harbour installations 22Annex B (informative) Anode resistance, current and life determination 24Annex C (informative) Typical electrochemical char
19、acteristics of impressed current anodes .29Annex D (informative) Guidance related to the design process 30Bibliography .32BS EN ISO 13174:2012ISO 13174:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
20、The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-g
21、overnmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
22、The main task of technical committees is to prepare International Standards. 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 vo
23、te.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 13174 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/
24、TC 219, Cathodic protection, in collaboration with Technical Committee ISO/TC 156, Corrosion of metals and alloys, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).ISO 13174 cancels and replaces EN 13174:2001, which has been technically revised.iv ISO
25、2012 All rights reservedBS EN ISO 13174:2012ISO 13174:2012(E)IntroductionCathodic protection is applied, sometimes in conjunction with protective coatings, to protect the external surfaces of steel harbour installations and appurtenances from corrosion due to seawater, brackish water, saline mud or
26、soil fill.Cathodic protection works by supplying sufficient direct current to the immersed external surface of the structure to change the steel to electrolyte potential to values where corrosion is insignificant.The general principles of cathodic protection in seawater are detailed in ISO 12473. Th
27、e general principles of cathodic protection in soils are detailed in EN 12954. ISO 2012 All rights reserved vBS EN ISO 13174:2012BS EN ISO 13174:2012Cathodic protection of harbour installations1 Scope1.1 GeneralThis International Standard defines the means to be used to ensure that cathodic protecti
28、on is efficiently applied to the immersed and driven/buried metallic external surfaces of steel port, harbour, coastal and flood defence installations and appurtenances in seawater and saline mud to provide protection from corrosion.1.2 StructuresThis International Standard specifies cathodic protec
29、tion of fixed and floating port and harbour structures. This includes piers, jetties, dolphins (mooring and berthing), sheet or tubular piling, pontoons, buoys, floating docks, lock and sluice gates. It also specifies cathodic protection of the submerged areas of appurtenances, such as chains attach
30、ed to the structure, when these are not electrically isolated from the structure.This International Standard is to be used in respect of cathodic protection systems where the anodes are exposed to water or saline mud. For buried areas, typically in soil or sand filled areas behind piled walls or wit
31、hin filled caissons, which may be significantly affected by corrosion, specific cathodic protection design and operation requirements are defined in EN 12954, the anodes being exposed to soils.This International Standard does not cover the cathodic protection of fixed or floating offshore structures
32、 (including offshore loading buoys), submarine pipelines or ships.This International Standard does not include the internal protection of surfaces of any components such as ballast tanks, internals of floating structures flooded compartments of lock and sluice gates or the internals of tubular steel
33、 piles.1.3 MaterialsThis International Standard covers the cathodic protection of structures fabricated principally from bare or coated carbon and carbon manganese steels.As some parts of the structure may be made of metallic materials other than carbon steels, the cathodic protection system should
34、be designed to ensure that there is a complete control over any galvanic coupling and minimize risks due to hydrogen embrittlement or hydrogen-induced cracking (see ISO 12473).This International Standard does not address steel reinforced concrete structures (see ISO 12696).1.4 EnvironmentThis Intern
35、ational Standard is applicable to the whole submerged zone in seawater, brackish waters and saline mud and related buried areas which can normally be found in port, harbour, coastal and flood defence installations wherever these structures are fixed or floating.For surfaces which are alternately imm
36、ersed and exposed to the atmosphere, the cathodic protection is only effective when the immersion time is long enough for the steel to become polarized. Typically, effective cathodic protection is achieved for all surfaces below mid tide.For structures such as sheet steel and tubular steel piles tha
37、t are driven into the sea bed or those that are partially buried or covered in mud, this International Standard is also applicable to the surfaces buried, driven and exposed to mud which are intended to receive cathodic protection along with surfaces immersed in water.INTERNATIONAL STANDARD ISO 1317
38、4:2012(E) ISO 2012 All rights reserved 1BS EN ISO 13174:2012ISO 13174:2012(E)Cathodic protection may also be applied to the rear faces of sheet steel piled walls and the internal surfaces of filled caissons. Cathodic protection of such surfaces is specified by EN 12954.This International Standard is
39、 applicable to those structures which are, or may be in the future, affected by “Accelerated Low Water Corrosion” (ALWC) and other more general forms of microbial corrosion (MIC) or other forms of so-called “concentrated corrosion” associated with galvanic couples, differential aeration and other lo
40、cal corrosion influencing parametersNOTE Information is available in BS 6349-1:2000, Clause 59 and CIRIA C634 (see Bibliography)1.5 Safety and environment protectionThis International Standard does not address safety and environmental protection aspects associated with cathodic protection to which n
41、ational or international regulations apply.2 Normative referencesThe 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 amend
42、ments) applies.ISO 12473, General principles of cathodic protection in sea waterEN 12496, Galvanic anodes for cathodic protection in seawater and saline mudISO 12696, Cathodic protection of steel in concreteEN 12954, Cathodic protection of buried or immersed metallic structures General principles an
43、d application for pipelinesEN 13509, Cathodic protection measurement techniquesEN 50162, Protection against corrosion by stray current from direct current systems3 Terms and definitionsFor the purposes of this document, the terms and definitions in ISO 12473 and the following apply.3.1accelerated lo
44、w water corrosionALWClocalised corrosion generally found on the sea side at or just below the LAT level of structures, but can be present at all immersed levelsNote 1 to entry: This phenomenon is associated with microbiologically influenced corrosion (MIC) and generally quiescent conditions. (See CI
45、RIA C634.) Corrosion rates, without cathodic protection, can be as high as 2 mm/side/year and the corrosion is typically localized as large, open pitting3.2atmospheric zonezone located above the splash zone, i.e. above the level reached by the normal swell, whether the structure is moving or not3.3b
46、uried zonezone located under the mud line or in soil or fill3.4cathodic protection zonethat part of the structure which can be considered independently with respect to cathodic protection design2 ISO 2012 All rights reservedBS EN ISO 13174:2012ISO 13174:2012(E)3.5coating breakdown factorFratio of ca
47、thodic current density for a coated metallic material to the cathodic current density of the bare material3.6driving voltagedifference between the structure/electrolyte potential and the anode/electrolyte potential when the cathodic protection is operating3.7HATlevel of highest astronomical tide3.8i
48、mmersed zonezone located above the mud line and below the extended tidal zone or the water line at a draught corresponding to the normal working conditions3.9LATlevel of lowest astronomical tide3.10MTLmean tide level (also known as MSL mean sea level or MWL mean water level)3.11microbial corrosionco
49、rrosion associated with the action of micro-organisms present in the corrosion systemNote 1 to entry: Also called microbiologically influenced corrosion (MIC).3.12ROVremotely operated vehicle3.13pilingfoundation, tubular or sheet steel element forming part or whole of a harbour structure3.14splash zonethe elevation of the structure which is intermittently wet and dry due to the wave action just above the HAT3.15submerged zonezone including the buried zone, the immersed zone, the transition zone and the lower part of the tidal zone under the MWL See Figure 1.3.16
