By J D Harston, F Ropital

The corrosion of carbon steels in amine devices used for fuel remedy in refining operations is an immense challenge for the petrochemical undefined. Maximising amine unit reliability, including bettering throughput, move and therapy means, calls for greater methods of measuring and predicting corrosion premiums. although, there was an absence of knowledge on corrosion. This worthy document is helping to therapy this lack of understanding through summarising findings from over 30 vegetation. It covers such amine forms as methyl diethanolamine (MDEA), diethanolamine (DEA), monoethanolamine (MEA) and di-isopropanolamine (DIPA), and makes tips on fabrics and procedure parameters to maximize amine unit potency and reliability.

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25 N/A None (8) 133 Regenerator: corrosion at the level of the reboiler vapour return line; now the stainless steel clad has been extended into this zone Vapour return line: severe corrosion and erosion; now replaced by stainless steel piping (9) 133 Regenerator reboiler: SCC of 316 stainless steel tubes Regenerator: corrosion at the level of the reboiler vapour return line; corrosion of internal ladders Pumps: erosion of pump bodies Fi-fan heat exchanger: erosion of carbon steel tubes; replaced by stainless steel Piping: corrosion near bend, near inlet and outlet of pumps; replaced with stainless steel; vibration on rich amine line caused fretting-type failure (10) Amine unit corrosion in refineries Amine concentration (%) 4 Experiences of twenty-one plants using diethanolamine The plant numbers are given in parentheses.

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.

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.

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