October 2005

Special Report: Improving Process Control

Simple techniques for generating process control inferentials

Property estimation can be done with easy statistical tools and spreadsheet software

Shah, K., Aker Solutions US, INC.; Goel, S., Reliance Industries Ltd.

Use of inferentials in process control is growing. Sophisticated and high cost tools have been used to develop inferentials. This article evaluates the validity of Inferentials developed using simple statistical tools and spreadsheet software. The case study considered is for a fractionation section in a petrochemical plant. Regression and simulation analysis were used for inferential development. Use of simple principles as described is not limited to the case study and can be applied to almost any process related to petroleum/ petrochemical plants. Distillation towers in petroleum units are generally controlled by temperatures, but the final aim is to control the product qua

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