51312-01266-Sharing experience of high corrosion rates in Acid gas removal plant

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Product Number: 51312-01266-SG

ISBN: 01266 2012 CP

Author: Saad AL-Dhafiri

Publication Date: 2012

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Amine gas treating also known as acid gas removal plant is commonly meant for removal of hydrogen sulfide (H2S) and carbon dioxide (CO2) by using amine solvents from natural gases. Based on feed conditions in all practical considerations the most economical material selection is a carbon steel with exception of stainless steel clad for high severity of corrosion. Any increased throughput and deterioration of feed quality which are not uncommon over the years across the oil & gas industry are resulting in abnormal corrosion rates & severe fouling of the plants. Such approaches are not only reducing the plant reliability but also increasing operating & maintenance costs and often causing safety concerns. During past turnarounds of units high corrosion rates were observed in most of the equipment and piping. Even some of the equipment has developed leaks within 12 years of commissioning because of significant change in feed quality (H2S CO2 and water levels). The subject paper demonstrate details of salient observations remedial short term measures and long term approach with respect to material upgradation and design changes. The paper also highlights the necessary improvements envisaged in material selection & design changes for new projects keeping into consideration of life cycle cost of the project and reliable and safe operation of the plant. Key words: Amine gas treating acid gas removal hydrogen sulfide (H2S) carbon dioxide (CO2) most economical material selection high corrosion rates severe fouling cycle cost of the project