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07116 Materials Considerations for MEG Reclaim Systems

Picture for 07116 Materials Considerations for MEG Reclaim Systems
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Product Number: 51300-07116-SG
ISBN: 07116 2007 CP
Author: Michael W. Joosten, Marion Siersten, Ben Tier, and Christian Wintermark
Publication Date: 2007
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This paper compares the suitability of 22 Cr duplex stainless steel (UNS S31803), low alloy steel, and Alloy 625 (UNS N06625) for MEG reclamation systems. Oxygen is of particular interest. Corrosion of duplex stainless steel in the presence of high oxygen concentrations under MEG reclamation conditions is manifested as preferential ferrite dissolution and/or localized corrosion at crevices. Oxygen entry must be minimized to prevent corrosion of duplex stainless steel. Corrosion most likely occurs where salts deposit. Low alloy steels pit at low oxygen concentrations. Duplex stainless steel (with oxygen restrictions) and Alloy 625 are suitable for the MEG reclamation service conditions.
This paper compares the suitability of 22 Cr duplex stainless steel (UNS S31803), low alloy steel, and Alloy 625 (UNS N06625) for MEG reclamation systems. Oxygen is of particular interest. Corrosion of duplex stainless steel in the presence of high oxygen concentrations under MEG reclamation conditions is manifested as preferential ferrite dissolution and/or localized corrosion at crevices. Oxygen entry must be minimized to prevent corrosion of duplex stainless steel. Corrosion most likely occurs where salts deposit. Low alloy steels pit at low oxygen concentrations. Duplex stainless steel (with oxygen restrictions) and Alloy 625 are suitable for the MEG reclamation service conditions.
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