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Introduction of Impressed Current Cathodic Protection

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Types of cathodic protection methods

Element Secrificial anode system Impressed current system
types of cathodic protection methods Mg Anode, Al Anode, Zn Anode H.S.C.I Anode, M.M.O Anode
construction method - Deep Well Bed, Shallow Bed
pros
  • Time and space-efficient
  • No artificial maintenance required
  • No need for electricity
  • No problem when installing hazardous area
  • Can be installed on existing facilities
  • No need for a separate installation location
  • Uniform current distribution
  • No concerns about over-protection
  • No impact on adjacent facilities
  • Long anode lifespan due to use of wear-resistant anode
  • Artificial control of current is possible
  • Useful in narrow spaces
  • Automation is possible
  • Effective in high-resistance environments
  • Wide range of application methods
cons
  • Current control is not possible after installation.
  • Limited range of application methods.
  • Requires many installation locations.
  • Economically inefficient in high-resistance areas.
  • Unable to adjust current according to environmental changes.
  • Limited space requiring a long lifespan becomes difficult to install due to increased volume of anodes.
  • Always requires power supply.
  • Continuous expenditure on electricity.
  • Requires ongoing maintenance.
  • Requires land allocation for installation.
  • May cause interference with adjacent structures.

Deep Well Bed

WORK PROCESS

  • Anode Fabrication

    • Removal of
      cable cover

    • Connect
      Cable and Anode

    • Inject solder

    • Inject epoxy

    • Install cap

    • Inspection

  • BORING

    • BORING

    • Install steel casing

    • Install PVC Casing

    • depth measurement

    • Anode installation

    • Filling Coke Breeze

  • Fabrication

    • Vent Pipe fabrication

    • Support Pipe fabrication

  • Laying cable, vent pipe

  • Re-bar welding

  • Install T/B & J/B

  • Install Rectifier

  • Trial operation, potential adjustment

  • final inspection

Anode Fabrication

BORING

After Boring, Insulation of Steel Pipes

Boring Hole inspection

Anode installation

Vent Pipe fabrication

Filling Coke Breeze

Negative Cable connection

Installation T/B & J/B & Rectifier

SHALLOW

Tank bottom

deep well

Condenser

Potential Measurement Method

  1. Natural Potential Measurement: Measure in a state without applied impressed current.
  2. Protective Potential Measurement: Measure after applying impressed current using a rectifier.

Potential measurement procedure :

  • Rectifier off

  • Measure natural potential

  • Rectifier on

  • Measure Protective potential