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In order to achieve an optimum compromise of cost and performance, it is necessary to construct large multistage flash (MSF) desalination plants from a variety of materials, notably carbon steel, copper-base alloys, stainless steels, and titanium. This produces a number of situations where two or more materials are in contact, and special care is needed to ensure that serious galvanic corrosion is avoided. Examples of such bimetallic and multimetallic junctions in plants operated by the Saline Water Conversion Corporation of Saudi Arabia are titanium tube/aluminum bronze tubeplate and waterbox; carbon steel/stainless steel flash chamber linings; and copper alloy/carbon steel waterboxes and piping. Problems associated with some of these junctions in older plants and the techniques used to avoid problems in modern plants are described in the paper. It is concluded that by application of good corrosion engineering practice, serious galvanic corrosion at mixed-metal joints can be avoided.
desalination, multistage flash, galvanic corrosion, pitting, crevice corrosion, deaeration, bimetallic joints, cupronickel, stainless steels, Ni-resist, titanium, tubes tubeplates, pumps, flash chambers, waterboxes, anodes, acid cleaning
Al Zaharani, SG
Inco Middle East Projects Group, Birmington,
Cortest Laboratories Ltd., Sheffield,