Cathodic protection is a corrosion control method commonly used to protect pipelines and other metallic structures from corrosion. Corrosion is a major issue in the oil and gas industry, and it can cause significant damage to pipelines, resulting in costly repairs and downtime. In this article, we will provide an overview of cathodic protection on pipeline, including how it works, its benefits, and its applications.

How Does Cathodic Protection on Pipeline Work?

Cathodic protection works by creating an electrical circuit between the pipeline and a sacrificial anode made of a more reactive metal than the pipeline. The anode corrodes instead of the pipeline, which protects the pipeline from corrosion. There are two types of cathodic protection: galvanic and impressed current.

Galvanic cathodic protection involves the use of a sacrificial anode that is in contact with the pipeline. The anode corrodes instead of the pipeline, which protects the pipeline from corrosion. Impressed current cathodic protection involves using an external power source to create an electrical current that flows from the anode to the pipeline. The current prevents corrosion from occurring on the pipeline.

Benefits of Cathodic Protection on Pipeline

There are several benefits of cathodic protection on pipeline, including:

1. Increased Pipeline Lifespan

Cathodic protection can significantly increase the lifespan of a pipeline by preventing corrosion from occurring. Corrosion can cause damage to pipelines, resulting in costly repairs and downtime. Cathodic protection helps prevent this damage, extending the pipeline’s lifespan.

2. Cost Savings

Cathodic protection can also result in cost savings for pipeline owners. By preventing corrosion, pipeline owners can avoid costly repairs and downtime. Additionally, cathodic protection is a cost-effective method of corrosion control, as it is relatively inexpensive to install and maintain.

3. Improved Safety

Corrosion can compromise pipelines’ structural integrity, posing a safety risk. Cathodic protection helps prevent corrosion, improving the safety of pipelines and reducing the risk of accidents.

Applications of Cathodic Protection on Pipeline

Cathodic protection is commonly used in the oil and gas industry to protect pipelines from corrosion. It is used on both onshore and offshore pipelines, as well as in other applications, including:

1. Storage Tanks

Cathodic protection can be used to protect storage tanks from corrosion. This is particularly important in the oil and gas industry, where storage tanks are used to store crude oil and other petroleum products.

2. Marine Structures

Cathodic protection can also be used to protect marine structures, such as offshore platforms and ship hulls, from corrosion. These structures are exposed to harsh marine environments, which can cause significant corrosion damage.

3. Water Pipelines

Cathodic protection can be used to protect water pipelines from corrosion. This is particularly important in areas where the water supply is corrosive, such as areas with high dissolved salts.

To Sum Up

Cathodic protection is a critical corrosion control method commonly used to protect pipelines and other metallic structures from corrosion. It works by creating an electrical circuit between the pipeline and a sacrificial anode, which prevents corrosion from occurring on the pipeline. Cathodic protection has several benefits, including increased pipeline lifespan, cost savings, and improved safety. 

Great Western Corporation offers cathodic protection components. We consult, design build, and install them. Get in touch with us.