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EXTERNAL CATHODIC PROTECTION OF WELL CASINGS
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Available format(s): Hardcopy, PDF
Superseded date: 03-03-2023
Language(s): English
Published date: 01-01-2006
Publisher: National Standards Authority of Ireland
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.Only cited Standards give presumption of conformance to New Approach Directives/Regulations.Dates of withdrawal of national standards are available from NSAI.
ForewordIntroduction1 Scope2 Normative references3 Terms and definitions4 Description and assessment of corrosion risks 4.1 General 4.2 Description of corrosion risks 4.3 Corrosion risk assessment5 Prerequisites for application of cathodic protection 5.1 General 5.2 Electrical continuity 5.3 Electrical isolation 5.4 Cathodic protection equipment 5.5 Groundbed 5.6 Safety requirements6 Design of the cathodic protection 6.1 General 6.2 Voltage drop profile method 6.3 Polarisation curve method 6.4 Mathematical approach based on a field test 6.5 Simulation of the cathodic protection for a well7 Measurement of the well-casing-to-soil potential at the wellhead 7.1 General 7.2 Measuring points 7.3 Method used for potential measurement - Interpretation8 Additional cathodic protection equipmentAnnex A (normative) Voltage drop profileAnnex B (informative) Polarisation curve method applied to a wellAnnex C (informative) Determination by calculation of the potential shift at the bottom of the well and the well to soil resistanceBibliography
Explains methods used to evaluate the external corrosion hazards of well casings, as well as cathodic protection means and devices to be implemented in order to prevent corrosion of the external part of these wells in contact with the soil.
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