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51317--9682-Monitoring of Stagnant and Low-flow Lines in Petroleum Refineries

A failure in one of the de-salter relief lines of the crude distillation unit. This paper describes the probable causes and the adopted remedies for the localized corrosion observed in the insulated relief line. Circumstantial evidence and failure morphology were used in arriving at the root cause for this failure. 

Product Number: 51317--9682-SG
ISBN: 9682 2017 CP
Author: Faisal Al-Refai
Publication Date: 2017
Industry: Petroleum Refining
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With new advancements in the petroleum refining processes the need for monitoring of corrosion on the new and old systems is also transforming. This paper describes the experience gained in monitoring of stagnant and low flow lines of a refinery in Kuwait. After witnessing a failure in one of the de-salter relief lines of the crude distillation unit a comprehensive plan was prepared to identify and address similar cases in the entire refinery which was a major challenge.This paper describes the probable causes and the adopted remedies for the corrosion observed in the insulated de-salter relief line which was of highly localized in nature. Circumstantial evidence and failure morphology were studied in arriving at the root cause for this failure. Although samples of the pipe showed signs of aggravated external corrosion at the failure location after removal of insulation the reason assigned for the failure was due to under-deposit corrosion mainly on the pipe internal side.Based on the findings and experience gained from the above case a methodology for the monitoring of other stagnant and low-flow lines using advanced NDT (LRUT profile radiography etc.) was prepared and is currently under implementation.Keywords: Under deposit corrosion MIC Stagnant and Low-flow Lines Advanced NDT

Key words: Under deposit corrosion, MIC, Stagnant and Low-flow Lines, Advanced NDT

With new advancements in the petroleum refining processes the need for monitoring of corrosion on the new and old systems is also transforming. This paper describes the experience gained in monitoring of stagnant and low flow lines of a refinery in Kuwait. After witnessing a failure in one of the de-salter relief lines of the crude distillation unit a comprehensive plan was prepared to identify and address similar cases in the entire refinery which was a major challenge.This paper describes the probable causes and the adopted remedies for the corrosion observed in the insulated de-salter relief line which was of highly localized in nature. Circumstantial evidence and failure morphology were studied in arriving at the root cause for this failure. Although samples of the pipe showed signs of aggravated external corrosion at the failure location after removal of insulation the reason assigned for the failure was due to under-deposit corrosion mainly on the pipe internal side.Based on the findings and experience gained from the above case a methodology for the monitoring of other stagnant and low-flow lines using advanced NDT (LRUT profile radiography etc.) was prepared and is currently under implementation.Keywords: Under deposit corrosion MIC Stagnant and Low-flow Lines Advanced NDT

Key words: Under deposit corrosion, MIC, Stagnant and Low-flow Lines, Advanced NDT

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