Reliability analysis of pumps for uranium solutions

Air-operated diaphragm pumps transfer a solution of highly enriched uranyl nitrate in nitric acid between process steps and recirculate the solution for mixing and filtration. In evaluating the data from manufacturers and performing limited testing, certain limitations have been noted on the application of the air-operated dual-diaphragm pump. In particular, the potential detrimental effects due to relatively high inlet suction pressure have led to the recommendation that an alternative pump be used on tall tanks and that precautions be taken to limit spill-potential on pumps used with shorter tanks. By manifolding the air exhaust from each pump in a manner yet to be determined, the spill potential can be substantially reduced. The high noise levels (approaching 90 dB) should be reduced