CATHODIC PROTECTION APPLICATION ON OFFSHORE STRUCTURES

by Dedy Iskandar

AgendaWhat is corrosionBasic concept of cathodic protectionCathodic protection applicationField measurement cathodic protection

Corrosion is the deterioration of a material, usually a metal, because of a reaction with its environment.

Basic conceptMaterials Selection Galvanic Series Magnesium Most ActiveZincAluminumMild SteelCast IronCopperStainless SteelSilverGold Platinum Least Active

Cathodic protection by sacrificial anodeCathodic protection by Impress Current

Cathodic Protection Application on Offshore StructuresSacrificial anode installedNo Sacrificial anode installed

Cathodic Protection Application on Offshore StructuresBasis of Design StandardApplicable industry standardsDNV-RP-B401-2005: Cathodic Protection Design NACE RP0176: Corrosion Control of Steel Fixed Offshore Structures

Applicable BP SpecificationsGP 06-31 : Guidance on Practice for Cathodic Protection GP 06-311 : Guidance on Practice for Procurement of Cathodic Protection Goods and Services

Cathodic Protection Application on Offshore Structures - PipelineSled anode dan Clamp for upgrade the wastage anode on subsea pipeline Rigid SledSemi-Rigid Sled

Cathodic Protection Application on Offshore Structures - PipelineRigid Anode Sled Deployment

Cathodic Protection Application on Offshore Structures - LegRetroPod and Clamp for upgrade the wastage anode on leg of platform

Cathodic Protection Application on Offshore StructuresCP-Mat and RetroLink options for Caissons and other minimal structures

Advantage & Disadvantage of Sacrficial Anode ICCP (Impress Current Cathodic Protection)Sacrificial AnodeThe advantages are :The disadvantage are :ICCPThe advantages are :The disadvantage are :

Field measurement cathodic protection

To measurement level of protection the structures we have to using reference cells.- Cu/CUSO4 (Copper/Copper sulfate) for Soil environment - Ag/AgCl (Silver/Silver Chloride) for sea water environment

Field measurement cathodic protectionLevel of Protection

Field measurement cathodic protectionMeasurement level protection on the offshore structure method:- Drop Cell Survey- CP Snake Survey- ROV ( Robotic Operation Vehicle)

Field measurement cathodic protection

Thank you..