Dr. T. Ravisundar of HydroAire Inc. is a chief engineer with a Ph.D. in fluid dynamics. Dr. T. Ravisundar provides engineering support to Hydro’s worldwide pump service centers. Dibu Chowdhury of HydroAire Inc. is a design engineer at Hydro’s nuclear-certified facility in Chicago, Ill. Dibu specializes in finite element analysis, providing engineering review throughout the pump rebuilding process. Heinz P. Bloch, P.E., of Process Machinery Consulting, has authored 18 comprehensive textbooks and more than 340 publications on machinery reliability and lubrication. Bloch, a registered consulting engineer and member of the Vibration Institute and the American Society of Mechanical Engineers retired from Exxon after 24 years of service as Exxon Chemical’s regional machinery specialist for the United States.