CEP: February 2016 Process safety performance indicators (PSPIs) are performance metrics that indicate when a process safety accident is most likely to occur. The key to an effective PSPI program is selecting the right PSPIs. This month’s safety article explains the barrier-based and tier-based approaches for selecting PSPIs. Other topics this month include PID tuning coefficients, electrolyte simulation, and polymerization reaction systems. Editorial An Editor Changes Their Mind about They When I began my career in 1980, women were a small fraction of the engineering workforce, and engineers were typically referred to by the pronouns he and him. That sexist language bothered me, so wherever I could, I used gender-neutral terms — such as synthetic instead of man-made, and firefighter instead of fireman — and rewrote sentences to avoid the need for any pronoun. In all that time, I was vigilant to not write they or their with a singular antecedent. Read more Share Predict Incidents with Process Safety Performance Indicators February2016SafetyWahid AziziBecome a seer of process safety incidents with carefully chosen process safety performance indicators (PSPIs). A PSPI program developed using the barrier-based or tier-based approach will serve as your crystal ball. PID Explained for Process Engineers: Part 2 - Tuning Coefficients February2016Back To BasicsCecil SmithThe appropriate values for the proportional, integral, and derivative mode tuning coefficients for a PID controller must reflect the behavior of the process and the desired performance from the control loop. Modeling Mixed-Solvent Electrolyte Systems February2016Computational MethodsMeng Wang, Yue Yu, Chau-Chyun ChenThe fundamental thermodynamic equations developed for aqueous electrolyte systems provide a springboard for modeling the more-complex and less-understood mixed-solvent electrolytes. Designing Polymerization Reaction Systems February2016Reactions and SeparationsShrikant Dhodapkar, Pradeep Jain, Carlos VillaImportant considerations in polymerization reactor design include heat removal, kinetics, and process dynamics, as well as polymer properties and product quality. Copyright Permissions: Would you like to reuse content from CEP Magazine? It’s easy to request permission to reuse content. Simply click here to connect instantly to licensing services, where you can choose from a list of options regarding how you would like to reuse the desired content and complete the transaction.