By J D Harston, F Ropital
The corrosion of carbon steels in amine devices used for gasoline therapy in refining operations is an incredible challenge for the petrochemical undefined. Maximising amine unit reliability, including bettering throughput, flow and therapy potential, calls for more beneficial methods of measuring and predicting corrosion premiums. besides the fact that, there was a scarcity of knowledge on corrosion. This worthy file is helping to therapy this lack of understanding through summarising findings from over 30 vegetation. It covers such amine kinds as methyl diethanolamine (MDEA), diethanolamine (DEA), monoethanolamine (MEA) and di-isopropanolamine (DIPA), and makes tips about fabrics and technique parameters to maximize amine unit potency and reliability.
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Additional resources for Amine unit corrosion in refineries EFC46 (European Federation of Corrosion)
0 133 Ti tube failure Regenerator: corrosion at the level of reboiler vapour return line; (7) 17 148 N/A Experiences of ten plants using methyldiethanolamine Amine concentration (%) 18 Summary of selected data continued Acid gases (mol mol–1) ——————————————— In rich amine In lean amine HSAS (%) Reboiler temperature (∞C) Corrosion problems Plant now the stainless steel clad has been extended into this zone Vapour return line: severe corrosion and erosion; now replaced by stainless steel piping ?
6 (formate and acetate) 1–5 Not known ? 0? 4 m s–1 for stainless steel. 2 Location of problems per item of equipment Regenerators (7), (8), (11), (12), (13), (16), (17), (18) Regenerator overheads drum (1), (4), (5), (12) Regenerator overheads condenser Regenerator overheads piping (4), (5), (12) (2), (5) Regenerator reboiler (1), (7), (8), (11), (12), (13), (14), (15), (17), (18), (20) Rich–lean exchanger (3), (6), (7), (9), (11), (12), (14), (18) Lean amine (1), (11) 30 Amine unit corrosion in refineries 5 Experiences of four plants using monoethanolamine The plant numbers are given in parentheses.
5 (5) (6), (7), (9) (8) Corrosion problems experienced Desorbers reflux line and pumps N/A (1) (2), (3) Regenerator reboiler: corrosion of tubes on the shell side (4) Regenerator reboiler: corrosion of the vapour section, now clad with stainless steel (5) Regenerator reboiler: stress corrosion cracking (SCC) of 316 stainless steel tubes (10) Rich amine feed preheater: SCC, now stress relieved (5) Rich amine line: from the valve to the column corroded, move the valve closer to the column (5) Lean amine general: H2S lean loading too low, increase from 100 ppm to >600 ppm (5) 16 Amine unit corrosion in refineries High pressure (HP) absorber: uniform corrosion of the vessel wall from the normal amine level to the top of packing at the side of the gas inlet nozzle for 180∞ of circumference (note too low amine circulation rates with too high H2S loading of the amine solution).
Amine unit corrosion in refineries EFC46 (European Federation of Corrosion) by J D Harston, F Ropital
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