Foreword

1Scope

2Normative references

3Terms and definitions

4Assessment of CP effectiveness

5Application principles

5.1IR-free potential measurements

5.2DC and AC currents and current densities

5.3Spread resistance

5.4Corrosion rate measurements

6Design considerations

6.1General

6.2Geometry of the defect

6.3Dimension of the coupon base plate

6.4Surface area of the coupon

6.5Other types of coupon geometries

7Monitoring purpose — Selection of installation sites

7.1General

7.2Detailed and comprehensive assessment of CP effectiveness

7.3Assessment of CP effectiveness under DC interference conditions

7.4Assessment of CP effectiveness under AC interference conditions

8Installation procedures

9Commissioning of coupons

9.1Preliminary checking

9.2Start up

9.3Measurement of the settled parameters

9.4Installation and commissioning documents

9.5Frequency of coupon measurement

Annex ASpecial types and procedures of coupons and probes (informative)

A.1Coupons for determination of weight loss and pitting

A.2Perforation probes

A.3ER probes

Annex BAssessment of the effectiveness of CP under any conditions including DC and/or AC interferences (informative)

B.1CP criteria based on the IR-free potentials

B.2AC interference

B.3Real time remote monitoring and control of the rectifiers based on coupon data

Annex CExamples of instant-off and current density measurements on coupons — Remote monitoring and remote control (informative)

C.1Real-time remote monitoring and control of the rectifier based on IR-free potential measurements in cases of DC interference

C.2Real-time remote monitoring and control of the rectifier based on current density measurements in cases of DC interference

C.3Real-time remote monitoring and control of the rectifier based on on-potential measurements in case of AC interference

Bibliography