Cathodic Protection Services​

Cathodic Protection Services

Cathodic Protection is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode in the same cell. The steel pipeline is cathodically protected by its connection to a sacrificial magnesium anode buried in the same soil electrolyte.

Cathodic protection was first developed by Sir Humphrey Davy in 1824 as a means of controlling corrosion on British naval ships.

Cathodic protection prevents corrosion by converting all of the anodic (active) sites on the metal surface to cathodic (passive) sites by supplying electrical current (or free electrons) from an alternate source. Usually this takes the form of galvanic anodes, which are more active than steel.

Cathodic Protection System
Cathodic protection is an electrochemical process for preventing corrosion to metallic structures which are installed in the electrolyte. protect buried structures such as pipelines, Storage tanks (above ground/underground), Vessels, Mounded bullet tanks, Ship hulls, Jetty piles, Reinforced steel concrete, etc.

Cathodic Protection System is implemented to protect buried structures such as pipelines, Storage Tanks (above ground/underground), vessels, mounded bullet tanks, ship hulls, jetty piles, reinforced steel concrete, etc.

Cathodic Protection system are widely classified in two types are as:
1. Sacrificial Anode Cathodic Protection (SACP) System.
2. Impressed Current Cathodic Protection (ICCP) System.

Sacrificial Anode Cathodic Protection (SACP) System
Sacrificial Anode Cathodic Protection (SACP) system can be implemented for short period and where requirement of current is less using Sacrificial anodes such as Magnesium, Zinc or Aluminum Anode.

Impressed Current Cathodic Protection (ICCP) System
Impressed Current Cathodic Protection (ICCP), a system used to control the corrosion using anodes connected to a DC power source. It is implemented where current requirement is high. Anodes used in this system such as Mixed Metal Oxides, High Silicon Chromium Iron Anode, etc. We provide complete range of services right from Field survey, Design, Engineering and materials supply, Site erection of CP system, Testing & commissioning and Maintenance of the CP system. .

Cathodic Protection System is implemented to protect buried structures such as
Cross Country Pipelines
Plants (Hydrocarbon Plant, Fertilizer Plant, Power Plant & Water Processing Plant)
Tank Bottom External/Tank Internals
Vessels / Bullets / Offshore(Platforms & Pipelines)

We have dedicated team of Cathodic Protection Specialist, Cathodic Protection Technologist and Cathodic Protection Technicians, to provide a specialized wide range of services like
Feasibilities surveys reports, review and certification
Tendering assistance to clients
Design and Engineering
Design review and validation
Installation Supervision & Testing and Commissioning
Trouble shooting & Technical Audits
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Pipeline Specialized Surveys
TREE ENGINEERING provides specialized pipeline surveys to monitor the efficiency, productivity and output of CP systems. This is essential to any CP program and ensures the continued operation of your facility.

Soil Resistivity:

It gives us an idea of the corrosively of soil. The soil resistivity indicates the relative capability of the soil to conduct electrical current. Higher the current, higher is the corrosion.


Close interval potential survey is carried over the entire length of the pipeline to identify the if the installed CP system is providing the required protection against external corrosion.

Current Attenuation Test (CAT):

The main objective of CAT Survey is, To identity of pipeline sections where coating deterioration is expected To estimate the health of the pipeline coating..

Direct curent voltage gradient (DCVG):

A direct current voltage gradient (DCVG) survey is a type of survey method that is used to find the effectiveness of coating on buried pipelines. This is highly useful in the natural gas and oil industries, as this technique is used to trace and pinpoint the coating faults.

External Corrosion Direct Assessment (ECDA):

The assessment involves estimating the remaining life of the existing structure and the remaining strength.

Ultrasonic Thickness Measurement:

This method involves the measurement of metal thickness of structures such as pipeline, steel plating insides, tanks, decks, superstructures, etc. The purpose is to determine the extent of corrosion on the structure and to estimate its remaining useful life.

Coating Peeling Test:

Coating Peeling Test is to determine the bond strength between the coating and the metallic structure. It is an essential aspect of assessing the products’ overall quality.
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Corrosion Monitoring System

1. Monitoring: -

Routine monitoring is recommended for all CP installations. The purpose of monitoring is to ensure the system is operating efficiently. Monitoring is comprised of both a visual inspection and electrical testing. The general monitoring schedule will be: -

2. Maintenance: -

The major causes of Cathodic Protection failure are due to negligence in effective maintenance. Maintenance for Cathodic Protection systems include the following: -Clean and tighten all bolted current – carrying connections.

Checking the indicating meters for accuracy.
Replace damaged and faulty spare parts.
Cleaning and Lubricating of Screws and terminals of the junction boxes and covers, and Repair any broken test post and reposition if necessary.
Record the readings for all test points along the pipeline.
Adjust the rectifier output according to the required protection level value.
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