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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.
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
Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken. The failed sample was removed for metallurgical analysis and determination of mechanism(s).
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The purpose of this paper will be to: (a) review published literature to characterize and classify speciation related to the types of impurities encountered in opportunity crudes; and (b) describe and categorize published case studies of corrosion in crude unit overhead operations.
It has been documented that improved desalting efficiency reduces the risk of corrosion and vice versa. This paper introduces a new way of using the desalting process to help control overhead corrosion. The end result is the corrosion engineer has a new tool to reduce the risk of salt formation.