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51313-02374-Synergistic Effect of Erosion-Corrosion & Galvanic Corrosion in Crude Distillation Tower Top Section

Product Number: 51313-02374-SG
ISBN: 02374 2013 CP
Author: Saad Al Dhafiri
Publication Date: 2013
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$20.00
$20.00

Atmospheric distillation is the primary unit of oil refining industry. Any major upset or unplanned shutdown in this unit greatly affect the profitability of the refinery.  As an industry’s best practice depending on crude quality plant configuration and fouling conditions time based inspection interval of four years is the optimum run length between two major overhauls.

Ever growing demand for petroleum products and utilization of existing plants beyond the design capacity  is not uncommon across the industry. Management of changes usually upto 10 ~ 15% over the design limits may not affect plant reliability but subsequent any changes and deviations in the process conditions will significantly affect the reliability and overall integrity of the plant.

First time after approximately 25 years of service during recent four year run length of the unit distillation tower shell has experienced severe localized thinning and erosion-corrosion in the overhead section (interface of monel clad plate). This paper describes in detail cause of failure including design deficiency for shock condensation in the tower top section process and metallurgical changes made over a period of time synergistic corrosion phenomena corrosion monitoring and mitigation measures undertaken to improve the plant reliability & integrity.

Key words: Crude distillation tower plant reliability erosion-corrosion galvanic corrosion shock condensation monel clad plate failure investigation mitigation measures.

Atmospheric distillation is the primary unit of oil refining industry. Any major upset or unplanned shutdown in this unit greatly affect the profitability of the refinery.  As an industry’s best practice depending on crude quality plant configuration and fouling conditions time based inspection interval of four years is the optimum run length between two major overhauls.

Ever growing demand for petroleum products and utilization of existing plants beyond the design capacity  is not uncommon across the industry. Management of changes usually upto 10 ~ 15% over the design limits may not affect plant reliability but subsequent any changes and deviations in the process conditions will significantly affect the reliability and overall integrity of the plant.

First time after approximately 25 years of service during recent four year run length of the unit distillation tower shell has experienced severe localized thinning and erosion-corrosion in the overhead section (interface of monel clad plate). This paper describes in detail cause of failure including design deficiency for shock condensation in the tower top section process and metallurgical changes made over a period of time synergistic corrosion phenomena corrosion monitoring and mitigation measures undertaken to improve the plant reliability & integrity.

Key words: Crude distillation tower plant reliability erosion-corrosion galvanic corrosion shock condensation monel clad plate failure investigation mitigation measures.

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