Severe external corrosion was noted on the 36'' main crude feeder line. A wall thickness scan was done and a minimum of 3,5mm wall thickness remained on several bad spots of approximately 200mm in diameter.
The original nominal thickness was 11.5 and the minimum required design thickness was 5,0mm
Further deterioration of the pitting corrosion could result in leaking of process which would have detrimental effects to the refinery crude oil supply due to possible equipment downtime. Furthermore, leaking process could result in major fire and environmental hazards.
A successful repair was implemented that will allow the elbow section to remain in service for the next 20 years. The elbow was further painted with a UV protection to protect it from natural elements. The repair was completed in 2 days including prepping and installation.
