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CATHODIC PROTECTION DESIGN

CATHODIC PROTECTION DESIGNSTRUCTUREM etal, DESIGN Life, Dimensions, Coatings, OtherCOST AND IMPLEMENTATIONLOCATIONE nvironmental Conditions, Other StructuresANODE AND HARDWARE SELECTIONC urrent Output, DESIGN Life, TYPEI mpressed Current, Sacrificial CURRENT DEMANDI nitial, Mean, CRITERIAP otential for CATHODIC Protectionfrom Swain Classnotes (1996) 2 Table of Contents Introduction .. 3 Structure .. 3 Location .. 3 CP Criteria .. 4 Potential Values .. 4 300 mV Shift .. 5 100 mV Shift .. 5 E-log-I Curve .. 6 Anodic Current Discharge Points .. 6 CATHODIC PROTECTION Current Demand .. 6 Recommended Practice RP B401, Det Norske Veritas .. 6 Uncoated steel .. 7 Coated steel ..7 pipeline 9 Concrete .. 9 Current Requirements for Pipelines in Soils of Different 10 Current Requirements for Ship 11 Cp Type .. 12 Anode 13 Anode Resistance to Ground .. 16 Anode Ground Anode Current Output ..18 Anode Size, Weight, Number, Distribution and DESIGN Life.

conditions of the steel (i.e. uncoated, coated, concrete reinforcing steel, pipeline). 7 5.1.1 Uncoated Steel Three design current densities are given: initial, final, and average. Initial This is the current density required to effect polarization of the initially exposed bare steel surface. It assumes some atmospheric rusting and/or

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