Cathodic protection system for pipeline

What is cathodic protection and how does it work? When is cathodic protection needed? However, as with all design efforts there are a wide number of factors that need to be considered for a sound design that meets generally accepted industry practices. Cathodic Protection Connections meet this low resistance requirement, both when installed and over the life of the system.

The pipe used in transmission pipeline systems is usually a highly stressed thin wall steel pipe. Any connection to this pipe by the cathodic protection wires or the test leads must not damage the pipe.

The sacrificial metal then corrodes instead of the protected metal. For structures such as long pipelines , where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current. Cathodic protection systems protect a wide range of metallic structures in various environments. With forty years of experience in the corrosion control industry , Allied Corrosion is a leader in cathodic protection and leverages its know-how and expertise to ensure that your pipeline is cathodically protected according to latest NACE guidelines and “Recommended Practices”. The most obvious reason to monitor pipeline cathodic protection is to make sure the system is functioning correctly and providing adequate corrosion protection.

When a structure corrodes, leaks may occur, and the product may be lost. There is also concern over public safety and environmental damage. The oil and gas industry, in particular, uses cathodic protection systems to prevent corrosion in fuel pipelines , steel storage tanks , offshore platforms , and oil well casings.

This is accomplished by applying a direct current to the structure which causes the structure potential to change from the corrosion potential (Ecorr) to a protective potential in the immunity region.

When properly applie CP stops the corrosion reaction from occurring. An important aspect of such retrofitting is the determination of when such action should take place. Assessment of cathodic protection systems on pipelines is normally performed based on potential measurements.

It offers the following value proposition: environmentally safe, long lasting performance, and the best value for your money. Technicians usually measure the current in milliamps per kilometer. They apply the current to the pipelines via units known as transformer-rectifiers, which convert AC electricity into DC.

The plant uses this electricity to lower the ‘energy’ of the pipeline. The underground pipeline coating is not robust so cathodic protection is required to protect against corrosion. Heat of welding destroys soil side bottom plate coating which is not repairable Welding of steel plate in micro structure changes in steel resulting in formation of corrosion cells and significant metal loss. But the corrosion monitoring strategy is aimed at establishing condition of pipelines and environmental variables that may accelerate corros ion process and this.

Get up to speed on cathodic protection systems with The Basics. Galvanic anode CP systems provide cathodic current by galvanic corrosion or by sacrificing one material to prevent corrosion of the other. Both the structure and the anode must be in contact with the electrolyte. The CP cost could be 5-times, if it is installed after completion of project as it involves lot of excavation and restoration of structures.

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