In 1995, there were two failures in the 20.000 BPD HF Alky unit at the Amuay Refinery causing a shutdown of the unit. The failures occurred in one flange and one weld in the depropanizer charge carbon steel pipe, containing propane, isobutane and anhydrous hydrofluoric acid at 190 F (88C) and321 psig...
Keywords: alkylation, hydrofluoric acid, ultrasonic testing, chemical analysis, on stream inspection, carbon steel fittings, carbon steel pipe, copper, nickel, chromium.