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Evaluation & Condition Monitoring of CP System

Evaluation & Condition Monitoring of CP System

Cathodic Protection can be defined as the control of electrolytic corrosion by the application of direct current in such a way the structure to be protected is made to act as the cathode of an electrolytic cell.
Cathodic Protection is used to control the corrosion of a wide variety of buried and submerged metallic structures. It is a cost-effective way to extend the life of a structure and to ensure integrity throughout its operating life.

Why Cathodic Protection?

Cathodic protection provides effective corrosion control on steel structures and pipelines by creating a potential (voltage) gradient opposing the flow of ions away from the surface, thus preventing the anodic corrosion reaction. Cathodic protection may be used alone or in combination with an insulating coating. In such systems, the coating forms the first line of defence and where it is adherent and undamaged, the corrosive environment is kept away from the structure: where the coating is damaged, however, corrosion can occur and Cathodic protection provides protection. It is worth noting that Cathodic protection can only be applied in the presence of an electrolyte – it is not an antidote for atmospheric corrosion.

Methods Of Applying Cathodic Protection

  • Sacrificial Anode System
  • Impressed Current System

  • VELOSI Methodology

    The Job protocol is broadly classified into two parts:
  • Data review & engineering works
  • Fieldworks – surveys, inspections and investigations

  • VELOSI has identified seven (7) key steps to carry out evaluation & condition monitoring of CP system:

  • Pre-Assessment Study
  • Preparation of Methodology and Procedures
  • Technical Audit of Existing CP System Installation of Main Pipelines & Performance Assessment of Tank Form Area, Pump Stations Facilities and associated piping network
  • On/Off Potential Survey, CIP Survey and Line Current Survey
  • Visual Inspection of Heat Shrinkable Sleeves
  • Review & Evaluation of Remote Monitoring and Control System
  • Post Assessment of the Project – Final Reports & Deliverables
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