NEW February 2013 DEPARTMENT Propylene Production via Propane Dehydrogenation PAGE 33 www.che.com Sizing PressureRelief Valves PAGE 35 Centrifugal Pumps Process and Product Development Environmental Permitting for Dryers and Kilns Facts at Your Fingertips: Steam-System Water Preparation Recovering Phosphorus Energy-Effi cient Motorshttp://www.che.com