May 2008

Processing Developments

Distillation column relief loads—Part 2

The conventional method is expanded and a series of guidelines are developed

Nezami, P. L., Jacobs Engineering

In the first part of this article, a comparison between the two methods for distillation column relief load calculations was made. In this part, the conventional method will be expanded and a series of guidelines to predict relief loads for distillation columns in upset conditions will be developed. The method presented here is based mainly on the mass and energy imbalance at upset conditions. This method relies heavily on detailed analysis of the contingencies that must be executed on a case-by-case basis. It also is based on several assumptions that simplify the complex behavior of distillation columns and make it possible to determine relief loads through a series of simple calculations

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