Cathodic Protection may be defined as an electrochemical technique where the corrosion in a metal is reduced virtually to zero by making that metal a cathode by means of an externally applied electric direct current or by attachment to a much more electronegative metal called anode which is usually magnesium, aluminium or zinc.
There are generally two types of Cathodic Protection Systems:
- Sacrificial/Galvanic Cathodic Protection Systems; and
- Impressed Current Cathodic Protection Systems
A sacrificial/galvanic anode system consists of a sacrificial anode which will have a voltage difference with respect to the corroding structure, whereas an impressed current anode system, on the other hand, consists of an inert anode which will be forced to discharge a direct current via an external power source to the corroding structure that will flow through the environment to the structure.
International Standards include NACE, BSI, AS, DNV, DIN, JIS, ISO, IS, API, ASTM, AWWA and others. GreenScience Technologies is fully conversant with all the above codes, including client specific in-house standards, to design, engineer, construct and successfully commission any cathodic corrosion protection systems.
Experience – Over the last 30 plus years, we have designed, engineered, constructed and commissioned a wide spectrum of cathodic protection system configurations, from the very basic sacrificial anode system to the complex and challenging remote monitoring and control impressed current systems with multiple hybrid power sources including solar and thermo-electric generators. One of the most unique features of our remote monitoring and control impressed current systems is the ability to initiate the entire monitoring program, including the polarized instant off potentials, at every individual test post using the standard GSM network. This system can also be easily implemented in existing cathodic protection systems.
Services – At GreenScience Technologies, we provide a total turnkey solution for cathodic corrosion protection systems. Our capabilities encompass the full range of services including the following:
- Preparation of Project Terms of Reference
- Field Corrosion Hazard Assessment
- Front End Engineering Design (FEED)
- Preparation of Detailed Design Specification
- Design Computation and Simulation
- Cost Benefit Analysis
- Development of Installation Procedures
- Quality Assurance Plans
- Inspection Test Plans and Procedures
- Schedule of Materials and Specification
- Supply of All Cathodic Protection Materials/Equipment
- Project Management
- Pre-Commissioning and Commissioning of System
- Post Commissioning and System Performance Validation
- Routine Operations/Maintenance and Training
- Retrofitting and Troubleshooting of Existing Systems and any other related works
Materials – Our global procurement centre permits us to source the best value for money materials and equipment from approved manufacturers all over the world that meet our project specific requirements. Being present directly in a dozen countries, we also maintain a large stock inventory of the common items regularly required, in our local offices. These materials include the following:
- Impressed Current Anodes
- Sacrificial/Galvanic Anodes
- Transformer Rectifiers & Alternative DC Powered Systems
- Junction Boxes and Test Stations
- Reference Electrodes and Coupons
- Cables and Cable Connections
- Isolation and Over Voltage Protection Devices
- Test Instruments and Related Equipment
So, whether it is the smallest and simplest or the largest and most challenging projects, we have the technical knowhow, infrastructure and field proven expertise to deliver a pragmatic and sound engineering solution.