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.