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Blue discoloration of off-white sealant in contact with copper tube at medical facilities underconstruction was observed. The copper tube was being installed to transport medical-grade gasses and the sealant was used as an acoustical and smoke sealant at through-wall penetrations. In some areas of one facility, galvanized steel pipes inserts were used as sleeves for the copper pipes through the drywall, while in other areas, the copper pipe penetrated directly through the drywall. Observations of the discoloration prompted an evaluation of the copper tube, sealant, and potential adverse interactions.
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High temperature sulfidation (or sulfidic) corrosion of steel by sulfur species in crude oil has long been known to damage refinery equipment. Corrosion engineers have been using prediction curves derived from field corrosion data to estimate rates of sulfidation corrosion. However, a significant inaccuracy is often encountered in these estimations because of the extensive diversity in molecular structures of sulfur compounds in crude oils.