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RP-B401_2011-04.pdf

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RECOMMENDED PRACTICE DNV-RP-B401 CATHODIC PROTECTION DESIGN OCTOBER 2010 This document has been amended since the main revision (October 2010), most recently in April 2011. See “Changes” on page 3. DET NORSKE VERITAS FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, property and the environment, at
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  RECOMMENDED PRACTICE D ET  N ORSKE  V ERITAS DNV-RP-B401 CATHODIC PROTECTION DESIGN OCTOBER 2010 This document has been amended since the main revision (October 2010), most recently in April 2011. See “Changes” on page 3.  The electronic pdf version of this document found through http://www.dnv.com is the officially binding version© Det Norske VeritasAny comments may be sent by e-mail to rules@dnv.com For subscription orders or information about subscription terms, please use distribution@dnv.comComputer Typesetting (Adobe Frame Maker) by Det Norske Veritas This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believed to reflect the best of contemporary technology. The use of this document by others than DNV is at the user's sole risk. DNV does not accept any liability or responsibility for loss or damages resulting fromany use of this document. FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, property and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification andconsultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, andcarries out research in relation to these functions.DNV service documents consist of amongst other the following types of documents: —  Service Specifications. Procedual requirements. —  Standards. Technical requirements. —   Recommended Practices. Guidance.The Standards and Recommended Practices are offered within the following areas:A)Qualification, Quality and Safety MethodologyB)Materials TechnologyC)StructuresD)SystemsE)Special FacilitiesF)Pipelines and RisersG)Asset OperationH)Marine OperationsJ)Cleaner Energy O)Subsea Systems  D ET  N ORSKE  V ERITAS  Amended April 2011Recommended Practice DNV-RP-B401, October 2010see note on front coverChanges – Page 3 CHANGES ãGeneral As of October 2010 all DNV service documents are primarily published electronically.In order to ensure a practical transition from the “print” scheme to the “electronic” scheme, all documentshaving incorporated amendments and corrections more recent than the date of the latest printed issue, have beengiven the date October 2010.An overview of DNV service documents, their update status and historical “amendments and corrections” may be found through http://www.dnv.com/resources/rules_standards/. ãMain changes October 2010 Since the previous edition (January 2005), this document has been amended, most recently in April 2008. Allchanges have been incorporated and a new date (October 2010) has been given as explained under “General”. ãAmendments April 2011  —Item 6.5.2 has been amended and clarified concerning galvanic anode performance requirements. —A new Guidance note has been added to item 12.4.4 (Annex C). —The layout has been changed to one column in order to improve electronic readability.  D ET  N ORSKE  V ERITAS Recommended Practice DNV-RP-B401, October 2010Amended April 2011Page 4 – Contentssee note on front cover  CONTENTS1.GENERAL............................................................................................................................. 6 1.1Introduction...........................................................................................................................................61.2Scope......................................................................................................................................................61.3Objectives and Use................................................................................................................................71.4Document Structure.............................................................................................................................71.5Relation to Other DNV Documents.....................................................................................................7 2.REFERENCES...................................................................................................................... 7 2.1General...................................................................................................................................................72.2ASTM (American Society for Testing and Materials)......................................................................72.3DNV (Det Norske Veritas)...................................................................................................................72.4EN (European Standards)....................................................................................................................72.5NORSOK...............................................................................................................................................72.6ISO (International Organization for Standardisation).....................................................................72.7NACE International.............................................................................................................................8 3.TERMINOLOGY AND DEFINITIONS............................................................................. 8 3.1Terminology..........................................................................................................................................83.2Definitions..............................................................................................................................................8 4.ABBREVIATIONS AND SYMBOLS................................................................................. 9 4.1Abbreviations........................................................................................................................................94.2Symbols..................................................................................................................................................9 5.GENERAL CP DESIGN CONSIDERATIONS (INFORMATIVE).............................. 10 5.1General.................................................................................................................................................105.2Limitations of CP................................................................................................................................105.3Environmental Parameters Affecting CP.........................................................................................105.4Protective Potentials...........................................................................................................................115.5Detrimental effects of CP...................................................................................................................115.6Galvanic Anode Materials..................................................................................................................125.7Anode Geometry and Fastening Devices..........................................................................................135.8Use of Coatings in Combination with CP.........................................................................................135.9Electrical Continuity and Current Drain.........................................................................................13 6.CP DESIGN PARAMETERS............................................................................................. 14 6.1General.................................................................................................................................................146.2Design Life...........................................................................................................................................146.3Design Current Densities....................................................................................................................146.4Coating Breakdown Factors for CP Design.....................................................................................166.5Galvanic Anode Material Design Parameters..................................................................................176.6Anode Resistance Formulas...............................................................................................................186.7Seawater and Sediment Resistivity...................................................................................................186.8Anode Utilization Factor....................................................................................................................186.9Current Drain Design Parameters....................................................................................................18 7.CP CALCULATION AND DESIGN PROCEDURES.................................................... 19 7.1General.................................................................................................................................................197.2Subdivision of CP Object...................................................................................................................207.3Surface Area Calculations..................................................................................................................20
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