How is an underground steel pipeline protected from corrosion?

Protecting an underground steel pipeline from corrosion is essential to ensure its durability and safety over time.

Several methods are used, either individually or in combination, to prevent the deterioration of steel caused by corrosive agents in the soil.

Here are the main techniques:

External coating:

The pipeline is coated with insulating materials, such as bitumen, polyethylene, or epoxy resins, which create a physical barrier between the steel and the external environment. This method limits direct contact of the metal with moisture and corrosive agents present in the soil.

Cathodic protection:

This involves connecting the pipeline to a system that prevents corrosion through an electrochemical principle. The following types can be used:

Periodic inspection and maintenance:

It is important to monitor the pipeline over time to verify the effectiveness of the protection systems and to identify any signs of corrosion or anomalies that may require corrective action.

Filling material:

During installation, a filling material can be used around the pipeline that is less corrosive or promotes water drainage, reducing moisture around the pipeline.

These combined methods represent the most common techniques for protecting an underground pipeline, and the specific choice depends on factors such as soil type, environmental conditions, and the overall cost of the project.