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External Corrosion Direct Assessment (ECDA)

External corrosion direct assessment (ECDA) is one of integrity assessment applicable for underground pipeline. It is intended to evaluate the integrity of pipeline with respect to external corrosion attack (it’s capacity to hold operational pressure safely). It consists of series of close interval potential survey (CIPS), and, or  direct current voltage gradient (DCVG),  or alternatively,  long range ultrasonic test (LRUT) followed up by pipeline section digging for coating defect and metal thinning verification by using UT Scan. ECDA is finalized by FFS assessment to arrive at run-repair-replace-down rate  decision making. Remaining strength (MAOP) and remaining life of the pipeline are then determined.

 

 

 

Benefit of ECDA

a. It can identify and qualify the coating defect of the pipeline.

b. It can identify  the effectiveness of cathodic protection of the pipeline.

c. It improves pipeline integrity through well programmed and cost effective inspection and maintenance.

d. It reduces the likelihood of pipeline leaking and failure.

e. It improves pipeline remaining life.

f. It increases availability and decrease un-planned shutdown.

g. It decreases maintenance cost.