43 Engineering Practice Proof-Testing of Storage-Tank Safety Systems for Level Measurement Storage tanks containing hazardous materials require safety systems that must be prooftested. Incorporating digital technology into the level-measurement devices used in safety instrumented systems (SIS) offers significant safety advantages Equipment and Services 43 18 Focus on Laboratory Equipment Laboratory homogenizer for challenging products; A new era of laboratory mixing with this smart machine; A new generation of laboratory roller extruder; A new, compact recirculating chiller; Efficient solvent recovery for fast evaporation tasks; and more 48 Applied Technologies Modernizing the Process Optimization Toolset Chemical manufacturers are using advanced analytics solutions to transform the way their employees solve data-intensive optimization problems 18 Departments 4 Editor's Page Digital implementation The 5th Connected Plant Conference in Austin, Tex. highlighted the promise and challenges of the implementation of plant digitalization tools 64 Economic Indicators 48 Advertisers 50 Hot Products 51 CPI Special Advertising Section 62 Classified Ads 62 Subscription and Sales Representative Information 63 Ad Index Chemical Connections Follow @ChemEngMag on Twitter Join the Chemical Engineering Magazine LinkedIn Group Visit us on www.chemengonline.com for more articles, Latest News, New Products, Webinars, Test your Knowledge Quizzes, Bookshelf and more For content related to COVID-19 and the CPI, visit www.chemengonline.com/covid-19/ Coming in November Look for: Feature Reports on Process Control; and Construction Planning; A Focus on Level Measurement & Control; A Facts at your Fingertips on Personal Protective Equipment; a Newsfront on Water Treatment; a Solids Processing article on Particle Size Analysis; New Products; and much more Cover design: Tara Bekman 2 CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM OCTOBER 2021https://twitter.com/chemengmag https://www.linkedin.com/groups/3880479/ http://www.chemengonline.com http://www.chemengonline.com/covid-19/ http://WWW.CHEMENGONLINE.COM