Cathodic Protection

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TOC 1. INTRODUCTION TO CATHODIC PROTECTION Purpose References Corrosion Cathodic protection Types of cathodic protection systems 2. CATHODIC PROTECTION DESIGN Required information Determining the type and design of cathodic protection system APPENDIX A SOIL RESISTIVITY MEASUREMENT B CURRENT REQUIREMENT TESTING C EXAMPLES OF GALVANIC CATHODIC PROTECTION DESIGN D EXAMPLES OF IMPRESSED CURRENT CATHODIC PROTECTION DESIGN E SPECIFICATIONS FOR CERAMIC ANODE F RECTIFIER CURRENT INTERFERENCE LIST OF FIGURES 1-1 Corrosion of a pipeline due to localized anode and cathode sites 1-2. Galvanic and impressed current systems for cathodic protection 2-1. Design sequence for cathodic protection systems A-1. Wenner four-pin method for measuring resistivity A-2. Soil box for soil resistivity measurements B-1. Current requirement test on pipelines C-1. Galvanic anode cathodic protection for hydrant refueling system C-2. Galvanic anode cathodic protection for underground steel storage tank C-5. Layout of gas piping in residential district D-l. Cathodic protection system for gas main D-2. Impressed current cathodic protection for heating conduit system D-3. Cathodic protection for black iron hot water storage tank D-4. Fringe factor for stub anodes D-5. Dimensions for an elevated steel water tank D-6. Cathodic protection for tanks using rigid-mounted button-type anodes and platinized titanium wire D-7. Segmented elevated tank for area calculations D-8. Anode spacing for elevated steel water tank D-9. Anode suspension arrangement for elevated steel water tank D-10. Equivalent diameter factor for anodes in a circule in water tank