Abstract

Due to steadily increased unit sizes for multi-stage-flash (MSF) sea water desalination plants using brine recirculation the requirement for brine flow regulation has gained more and more importance and this for technical as well as economical reasons. Aspects of flow regulation by hydraulic coupling are briefly reviewed and compared technically and economically with the usually used method of flow regulation by throttling. The influence on mechanical and hydraulic design criteria for brine recirculation pumps is investigated. Utilisation of hydraulic coupling for Brine Recirculation Pumps in a 2 × 10 000 m 3/d MSF desalination plant in the Ruwais Utilities Complex in Abu Dhabi, U.A.E. is introduced.

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