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Internal Corrosion Direct Assessment (ICDA) is a process an operator uses to identify areas along the pipeline where fluid or other electrolyte introduced during normal operation or by an upset condition may reside, and then focuses direct examination on the locations in covered segments where internal corrosion is ...

ECDA is a four-step process that combines preassessment, indirect inspection, direct examination, and post assessment to evaluate the threat of external corrosion to the integrity of a pipeline.

External Corrosion Direct Assessment (ECDA) is a structured process that improves safety by assessing and reducing the impact of external corrosion on pipeline integrity.

External corrosion occurs due to environmental conditions on the outside of the pipe. It is the natural interaction between the exterior surface of the pipe and the soil, air, or water surrounding it. Many highly localized factors can contribute to the aggressiveness and persistence of external corrosion.

Direct Assessment — also known as DA — is limited to evaluating the risks of three time-dependent threats to the integrity of a pipeline segment: external corrosion, internal corrosion, and stress corrosion cracking.

What is external corrosion and why does it occur? Corrosion is the deterioration of a steel pipeline that results from an electrochemical reaction with its immediate surroundings. This reaction causes the iron in the steel pipe or other pipeline appurtenances to oxidize (rust).

Internal Corrosion Direct Assessment (ICDA) is a process an operator uses to identify areas along the pipeline where fluid or other electrolyte introduced during normal operation or by an upset condition may reside, and then focuses direct examination on the locations in covered segments where internal corrosion is ...

External corrosion direct assessment (ECDA) is a structured process that is intended to improve safety by assessing and reducing the impact of external corrosion on pipeline integrity.