EN 13509:2003

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Symbols
4 Buried structure to electrolyte potential
  4.1 Electrical equipment
  4.2 Potential measurement
  4.3 Factors influencing the potential measurement
  4.4 Potential measurement techniques
      4.4.1 Measuring technique including IR drop (on potential
            measurement)
      4.4.2 Measuring techniques to determine IR free potentials
            (E[ir free])
5 Immersed structure to electrolyte potential
  5.1 Electrical equipment
  5.2 Potential measurements
      5.2.1 Direct potential measurement methods
      5.2.2 Indirect potential measurement method
6 Other measurements
  6.1 Current measurements (d.c.)
  6.2 Isolating joints
  6.3 Foreign structures
  6.4 Coating
Annex A (informative) Table A.1 - Electrodes for Potential
        Measurements in Soil and/or Aqueous Media
Annex B (informative) Current reduction technique
Annex C (informative) Above ground surveys used to measure
        pipe to soil potential along a buried pipeline
Annex D (informative) Above ground surveys used to assess
        the coating condition and to locate coating defects
Annex E (informative) Special off potential measurements
        in stray currents areas
Annex F (informative) Explanatory note on the use of the
        intensive measurement technique and the calculation
        of the IR free potential (E[IR free])
Annex G (informative) Examples of typical coupons and external
        potential test probe for pipe
Annex H (normative) Accuracy of potential measuring equipment
Annex I (informative) Accuracy of current measurement
Annex J (informative) Evaluation of the resistance of isolating
        joints
Annex K (informative) Current injection test on isolating
        joints
Bibliography

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 measurements 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 regard 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.