August 2019

Process Control and Instrumentation

Estimation of relief load and realistic relieving temperature for heavy-end fractionating columns

Relief calculation is one of the most discussed aspects of chemical engineering design.

Saha, J., Fluor Daniel India Pvt. Ltd.; Chaudhuri, S., Bechtel India Pvt Ltd.; Groenendijk, S., Fluor

Relief calculation is one of the most discussed aspects of chemical engineering design. Licensors, contractors, industry literature and the American Petroleum Institute (API) specify the broad boundaries of “dos” and “don’ts” for relief system analysis and sizing. Still, much is left for engineering judgement to define the optimum safe design. This article examines the purview of relief load estimation and a realistic relieving temperature calculation method for distillation columns handling heavier cuts in a refinery. FIG. 1. Schematic representation of hydrotreated gasoil product fractionation. The conventional approach of tower relief load c

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