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1、BRITISH STANDARD BS EN 13509:2003 Incorporating Corrigendum No. 1 Cathodic protection measurement techniques The European Standard EN 13509:2003 has the status of a British Standard ICS 25.220.40; 77.060 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006, Uncontrolled C
2、opy, (c) BSI BS EN 13509:2003 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 23 June 2003 BSI 1 December 2003 ISBN 0 580 42129 5 National foreword This British Standard is the official English language version of EN 13509:2003. Attention is
3、 drawn to the fact that BS 7361-1:1991, Cathodic protection Part 1: Code of practice for land and marine applications, provides general information on cathodic protection. Note that BS 7361-1:1991 will eventually be withdrawn when all the CEN standards relating to cathodic protection currently being
4、 prepared are published. The UK participation in its preparation was entrusted to Technical Committee GEL/603, Cathodic protection, 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 Standar
5、ds 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. This p
6、ublication 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 interna
7、tional/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, the EN tit
8、le page, pages 2 to 38, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 14827 Corrigendum No. 1 1 December 2003 Changes to National foreword Licensed Copy:
9、sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13509 May 2003 ICS 25.220.40; 77.060 English version Cathodic protection measurement techniques Techniques de mesures applicables en protection cathodique
10、Messverfahren fr den kathodischen Korrosionsschutz This European Standard was approved by CEN on 27 December 2002. 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
11、alteration. Up-to-date lists and bibliographical references concerning such national standards 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 tra
12、nslation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland,
13、Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of
14、 exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13509:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 2 ContentsPage Foreword.3 Introduction 4 1Scope5 2Normative re
15、ferences5 3Terms, definitions and symbols5 3.1Terms and definitions.5 3.2Symbols .9 4Buried structure to electrolyte potential.10 4.1Electrical equipment.10 4.2Potential measurement.10 4.3Factors influencing the potential measurement11 4.4Potential measurement techniques.13 4.4.1Measuring technique
16、including IR drop (on potential measurement).13 4.4.2Measuring techniques to determine IR free potentials (Eir free).13 5Immersed structure to electrolyte potential.16 5.1Electrical equipment.16 5.2Potential measurements.16 5.2.1Direct potential measurement methods16 5.2.2Indirect potential measurem
17、ent method.17 6Other measurements 17 6.1Current measurements (d.c.).17 6.2Isolating joints.17 6.3Foreign structures.18 6.4Coating.18 Annex A (informative) Table A.1 - Electrodes for Potential Measurements in Soil and/or Aqueous Media19 Annex B (informative) Current reduction technique.20 Annex C (in
18、formative) Above ground surveys used to measure pipe to soil potential along a buried pipeline22 Annex D (informative) Above ground surveys used to assess the coating condition and to locate coating defects.23 Annex E (informative) Special off potential measurements in stray currents areas.25 Annex
19、F (informative) Explanatory note on the use of the intensive measurement technique and the calculation of the IR free potential (EIR free).26 Annex G (informative) Examples of typical coupons and external potential test probe for pipe.28 Annex H (normative) Accuracy of potential measuring equipment.
20、29 Annex I (informative) Accuracy of current measurement.31 Annex J (informative) Evaluation of the resistance of isolating joints .33 Annex K (informative) Current injection test on isolating joints .35 Bibliography .37 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006,
21、 Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 3 Foreword This document (EN 13509:2003) 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
22、 an identical text or by endorsement, at the latest by November 2003, and conflicting national standards shall be withdrawn at the latest by November 2003. This European Standard should be considered as a basic document developing general measurement techniques applicable for the protection of burie
23、d or immersed metallic structures. Annexes A, B, C, D, E, F, G, I, J and K are informative. Annex H is normative. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Euro
24、pean Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29
25、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 4 Introduction This European Standard describes the principles of the different methods of measurement used to assist in the design of the cathodic protection system of a buried or immersed metallic structure, for the verification of its
26、effectiveness and finally for its optimum operational conditions. It deals in particular with the measurement of the structure to electrolyte potential, which indicates whether or not the cathodic protection criterion for the structure is met. Apart from specifying the factors, which may influence t
27、he measurement of the potential, this European Standard describes the different techniques possible and their suitability in various situations. Further, this European Standard provides parameters to be controlled and measurements to be carried out (potential, potential gradient, current and resista
28、nce measurements) to ensure the correct functioning of the cathodic protection system and its effectiveness for the entire structure. Several measurement methods described in general terms in the body of the standard are explained in more detail in annexes. These methods differ from one another to a
29、ccount for differences in type or state of the structure, the local environment and the degree of accuracy selected. Measurements on buried structures that are not easily accessible e.g. pipe networks in urban areas are difficult to implement and interpret. To take measurements without the full know
30、ledge of the problems associated with the measurement technique renders the interpretation of the measurements difficult and leads to incorrect decisions. One of the clauses of this European Standard therefore outlines the difficulties encountered when measuring structure to electrolyte potentials,
31、and suggests several methods of measurement that take into account, or avoid, these difficulties. Based on knowledge and experience, the most suitable measurement techniques can be selected as described in this European Standard. In order to achieve effective and efficient cathodic protection, measu
32、rements should be performed by trained, experienced and responsible personnel. Instrumentation used for measurement should be kept in good working order and should be subjected to periodical calibration and safety checks. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006
33、, Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 5 1 Scope This European Standard deals with the cathodic protection against corrosion of buried or immersed metallic structures, detailing the measuring methods to be used for assessing the effectiveness of cathodic protection as well as the measurement
34、s and measures taken to monitor cathodic protection during operation. Throughout the text, the measurement techniques are described primarily for pipelines. However, they are sufficiently general to apply to other kinds of buried or immersed (except offshore) structures. General principles with rega
35、rd to cathodic protection are described in EN 12954. Other measurement methods specific to particular cases are described in other European Standards e.g. prEN 50162. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These n
36、ormative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated
37、references the latest edition of the publication referred to applies (including amendments). EN 12954:2001, Cathodic protection of buried or immersed metallic structures General principles and application for pipelines EN ISO 8044:1999, Corrosion of metals and alloys Basic terms and definitions (ISO
38、 8044:1999) 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this European Standard the following terms and definitions apply. For other terms and definitions related to corrosion refer to EN ISO 8044:1999 and to cathodic protection refer to EN 12954:2001. 3.1.1 anode b
39、ackfill material with a low resistivity, which may be moisture-retaining, immediately surrounding a buried anode for the purpose of decreasing the effective resistance of the anode to the electrolyte 3.1.2 backfill see anode backfill 3.1.3 bond metal conductor, usually of copper, connecting two poin
40、ts on the same or on different structures usually with the intention of making the points equipotential Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 6 3.1.4 buried structure any metal construction built or laid beneath g
41、round level or built on ground level and then covered with earth 3.1.5 calomel reference electrode reference electrode consisting of mercury and mercurous chloride in a solution of potassium chloride 3.1.6 cathodic protection system entire installation, including active and passive elements, that pr
42、ovides cathodic protection 3.1.7 cell current current flowing in a corrosion cell 3.1.8 coating defect deficiency in the protective coating (e.g. holidays, porosity) 3.1.9 coating resistance or structure to soil resistance (Rco) electrical resistance between a coated metal and the electrolyte expres
43、sed in ohms. It is determined largely by the size and number of coating defects, coating pores and the electrolyte resistivity 3.1.10 copper/saturated copper sulphate reference electrode reference electrode consisting of copper in a saturated solution of copper sulphate 3.1.11 coupon representative
44、metal sample used to quantify the extent of corrosion or the effectiveness of applied cathodic protection 3.1.12 d.c. traction system electrical traction system powered by direct current NOTEIf these systems have the return circuit earthed at more than one point or are not completely isolated they c
45、an generate stray currents, which may cause corrosion damage. 3.1.13 d.c. industrial plant electrical system, other than a traction system, powered by direct current NOTEIf these systems use the earth as a part of the return circuit, they can generate stray currents, which may cause corrosion damage
46、. Cathodic protection systems use the earth as a part of the circuit. 3.1.14 electrolyte liquid, or the liquid component in a medium such as soil, in which electric current flows by the movement of ions 3.1.15 electrolyte resistivity ( ) the specific electric resistance of the electrolyte assuming t
47、hat the electrolyte is homogeneous NOTEUsually expressed in m. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13509:2003 (E) 7 3.1.16 equalising currents currents that flow between areas of different polarisation after switching off the
48、protection current. Equalising currents can be a source of error in measuring IR free potentials 3.1.17 external potential test probe installation comprising a coupon with an associated reference electrode to provide structure to electrolyte potential measuring facilities devoid of IR drop errors 3.
49、1.18 foreign anode see Foreign Electrode 3.1.19 foreign cathode see Foreign Electrode 3.1.20 foreign electrode foreign electrode is either a foreign anode or a foreign cathode. A foreign anode is a metal or a conductive material in contact with the structure under consideration which has a more negative potential than the structure and a foreign cathode is a metal or a conductive material in contact with the structure under consideration, which has a more positive potential than the structure 3.1.21 fo
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