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Corrosion causes billions worth of dollars damage every year. Pipeline sections have to be taken out of operation and often larger sections must be replaced due to serious corrosion damage. New coatings must be applied over the ditch and in some cases serious damage is caused to substrates.
Pipeline Coating Problems
The reason for corrosion is that pipeline coatings in practice tend to fail. This failure strongly depends on the type of coating, the pipeline’s soil conditions (environmental aspect) and, in case of rehabilitation, the circumstances during which a pipeline’s coating was rehabilitated on site. In practice the application circumstances and surface preparation appear to be a critical part of a proper long lasting performance of a rehabilitated coating. Practice learns that many rehabilitated coating failures are caused by failures during application and improper surface preparation.
Common Causes of Corrosion Failures
Anti-corrosion failures are a significant factor in reduced operational life of pipelines. The Failure of a pipeline coating system accelerates corrosion and can result in leaks requiring repair, cleanup, and in some cases replacement of the pipeline. The cost of repair are significant, as are costs associated with spill containment and cleanups. The costs, environmental impact and negative publicity associated with failures are something every major oil and gas company seeks to avoid.
In the past 10-20 years, failure analysis of pipelines have been performed by a variety of companies, agencies and special interest groups, in an effort to reduce or eliminate failure incidents. These analysis are public information and contain a variety of good data.
For detailed comparisions the reader should consult the resources utilized by consulting STOPAQ EUROPE B.V.
The leading factor for pipeline failures in all studies was by far attributed to external corrosion.
