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98576 NAPHTHENIC ACID CORROSION IN SYNTHETIC FWELS PRODUCTION

Picture for 98576 NAPHTHENIC ACID CORROSION IN SYNTHETIC
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Product Number: 51300-98576-SG
ISBN: 98576 1998 CP
Author: Hendrik J. de Bruyn
Industry: Materials Selection and Design
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Serious corrosion damage to carbon steel piping in a fractionation unit associated with synthetic fuels production has been ascribed to the presence of naphthenic acids. Investigation of the problem revealed total acids numbers (TAN) ranging from 8 - 12mg KOH/g in the feed to the unit. Damage typically occurred in the temperature range 180 - 240°C and manifested as localized pitting, preferential weld corrosion, general wall thinning and end-grain attack. Filming amine corrosion inhibitors designed for refinery overhead systems have been proven ineffective and high temperature phosphate-based inhibitors could not be used due to potential catalyst poisoning in downstream refinery units. Coupon exposures indicated corrosion rates in the order of 2 mm/y on carbon steel in a reboiler line as well as pitting to austenitic stainless steel type UNS S30403. Line replacement in austenitic stainless steel UNS S31603 has been proven effective. The performance of this alloy is mainly ascribed to its molybdenum content. The absence of sulfur in the feed to the unit is also contributing to the alloy performance despite the extremely high total acid numbers. Keywords: naphthenic acid, refining, oil fractionation, materials selection, austenitic stainless steel
Serious corrosion damage to carbon steel piping in a fractionation unit associated with synthetic fuels production has been ascribed to the presence of naphthenic acids. Investigation of the problem revealed total acids numbers (TAN) ranging from 8 - 12mg KOH/g in the feed to the unit. Damage typically occurred in the temperature range 180 - 240°C and manifested as localized pitting, preferential weld corrosion, general wall thinning and end-grain attack. Filming amine corrosion inhibitors designed for refinery overhead systems have been proven ineffective and high temperature phosphate-based inhibitors could not be used due to potential catalyst poisoning in downstream refinery units. Coupon exposures indicated corrosion rates in the order of 2 mm/y on carbon steel in a reboiler line as well as pitting to austenitic stainless steel type UNS S30403. Line replacement in austenitic stainless steel UNS S31603 has been proven effective. The performance of this alloy is mainly ascribed to its molybdenum content. The absence of sulfur in the feed to the unit is also contributing to the alloy performance despite the extremely high total acid numbers. Keywords: naphthenic acid, refining, oil fractionation, materials selection, austenitic stainless steel
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