54 58 58 Engineering Practice A Best Practice for Relief-Valve Sizing An easy-to-use methodology that delivers accurate results Engineering Practice Safety-Instrumented Systems: Focus on Measurement Diagnostics New approaches help operators to achieve the needed safety at the lowest lifecycle cost EQUIPMENT & SERVICES 30 Focus on Seals & Gaskets Avoid pipe corrosion with this spacer; This packing system removes particles; Very soft gaskets prevent water ingress into enclosures; and more 33 Interphex Show Preview* Targeting the pharmaceutical industry, Interphex 2013 takes place April 23-25 in New York. This section presents a sampling of the products and services to be on display 54 32I-1 Powtech Show Preview To be held April 23-25 in Nuremberg, Germany, Powtech showcases solids processing and handling equipment. Here is a sampling of the products and services to be on display 32I-8 New Products* These actuators are designed for high pressures; Outsource high-throughput research with this service; Use this light for boiler inspections; Cover all applications with this rheometer; and more COMMENTARY 5 30 65 Editor's Page Bringing mobility to the plant In this era of information-driven manufacturing, mobile handheld devices are finding their way onto the plant floor The Fractionation Column We need NASA Inspired by a presentation about the Mars Curiosity mission, the author describes the many ways NASA's work impacts us DEPARTMENTS 6 Letters 8 Calendar 70 Who's Who 68 Reader Service 71 Economic Indicators ADVERTISERS 66 Product Showcase 67 Classified Advertising 69 Advertiser Index 33 COMING IN MAY *ONLY ON CHE.COM Look for more on the Interphex Show Preview and New Products; as well as Latest News and more Look for: Feature Reports on Root-Cause Analysis; and Inline Measurement; Engineering Practice articles on Shell-and-Tube Heat Exchangers; and Specifying Compressors; a Focus on Mixing; News articles on Petroleum Refining; and Dust Control; and more Cover: David Whitcher 2 CHEMICAL ENGINEERING WWW.CHE.COM APRIL 2013http://www.CHE.COM http://WWW.CHE.COM