The urea melt pump is a challenging application of a centrifugal type of pump: On the discharge side it has a relatively high pressure as the urea melt needs to be pumped up to the top of the prilling tower, which typically is some 100 m high. While on the suction side vacuum pressure exist. Furthermore the urea melt needs to be pumped with a minimum residence time to minimize biuret formation, so the residence time at the suction is limited. Finally the urea melt can easily crystallize transforming into biuret, triuret or further poly-urea products, which can cause cavitation and damage the pump.
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