The desalination units of Taweelah “B” project are currently under design stage. Fabrication, construction at site and then commissioning of the six units of 10–12.7 migd capacity each are scheduled to be completed within 33–43 months with effect from signing of the contract in the month of 06 ’92. The selection of materials for the evaporators and other major components such as pumps, valves, piping, etc. have been finalized. Many factors have been taken into consideration when selecting these materials such as their excellent corrosion resistance, protection of the seawater environment and health hazards, WED’s unique and considerable experience of more than 20 years in this field, assessment of the material behavior within the local environment and the successful (5) years operation of the 7.2 migd MSF units in Umm Al Nar desalination plant. The use of low grade materials has caused shutdown of units more frequently in the past resulting in a production loss of considerable quantity. On the contrary, enhancement of plant materials selection has permitted the plant to run safely and reliably with increased plant availability and no major damage. Also it has the advantage of less required maintenance. The inhouse experience of three consulting firms (Tractebel, Fichtner and Bechtel) who participated in the preparation of the specifications and also the recent development in materials science and technology have been utilized and incorporated.