AUGUST 2012 IN THIS ISSUE VOLUME 119, NO. 8 www.che.com COVER STORY 38 Cover Story A primer on gas-solid fluidization To develop suitable fluidizedbed processes for gas-solid systems, the ability to predict behavior and calculate essential operating parameters is critical. Key concepts and equations are presented NEWS 9 Chementator Coke oven offgases may help increase steel production; This valve tolerates up to 80% differential pressure; Methane recovery from a trona mine; A more efficient Fischer-Tropsch reactor; A self-healing dynamic membrane; and more 16 Newsbriefs ACC launches new macroeconomic indicator; A new Web application for renewable technology information; Mid-year outlook for U.S. chemistry is mixed; and more 17 Newsfront Achema takes a forward view The major emphasis at Achema 2012 was on preparing for a future where sustainability and bioprocessing are likely to play larger roles in CPI business and operations 23 Newsfront Seals & Gaskets New designs and materials allow seals and gaskets to stand up to harsh CPI conditions ENGINEERING 32a Facts at Your Fingertips Heat-transfer expansion tanks This one-page reference guide outlines proper design of expansion tanks in heat-transfer systems 33 Engineering Practice Waterhammer in condensate return lines Inserting high-pressure condensate into a lowpressure, pumped-condensate line can cause waterhammer. Understand why, and how to avoid it 48 Feature Report Control valves: An evolution in design Understanding the design features of globe-style control valves can help in their selection for specific applications 52 You and Your Job Process lead responsibilities in design projects Picking the right people for the job, and knowing what is required of them, is essential for the success of a project ONLY ON CHE.COM A Web-exclusive article on Information management for materials research and development; New Products; Latest news and more EQUIPMENT & SERVICES 28 Focus on Pipes & Fittings A tube welder for sterile biopharmaceutical applications; This hose is suited for food and pharma applications; Gasket tape for very large flanges; and more 31 Focus on Temperature Measurement & Control This pH probe has an integrated temperature sensor; Precise temperature control even when viscosity changes; This handheld device measures a wide temperature range; Detect a flame from a distance within seconds; and more 32I-1 New Products (International edition)* This butterfly valve has PTFE lining; A rubber liner prevents wear in this mixer; A flowmeter for large process lines; New RO membranes with high salt rejection; Measure moisture in natural gas lines; and more COMMENTARY 5 Editor's Page Tribute to an inspiration Reflections on the life and passing of the editor-in-chief's aunt, who had a profound influence on her professional career 56 The Fractionation Column Writing your employees' resumes The author relates what happened when he wrote resumes for each of his superb employees DEPARTMENTS Letters . . . . . . . . . . . 6 Calendar . . . . . . . . 7-8 Who's Who . . . . . . . 62 Reader Service . . . . 60 Economic Indicators . . . . . 63-64 ADVERTISERS Product Showcase . . 57 Classified Advertising . . . . 58-59 Advertiser Index . . . 61 COMING IN SEPTEMBER Look for: Feature Reports on Pumps; and Thin-film drying; Engineering Practice articles on Reciprocating compressors; and Cooling towers; a Focus on Flowmeters; News articles on Plant security; and Valves; and more Cover: David Whitcher CHEMICAL ENGINEERING WWW.CHE.COM AUGUST 2012 3http://www.che.com http://www.CHE.COM http://WWW.CHE.COM