Transcription of CATHODIC PROTECTION DESIGN
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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.
Average This is the anticipated current density required once the cathodic protection system has reached its steady state. The average or maintenance current density is used to calculate the minimum mass of anode material required to protect the structure throughout the design life.
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