December 2013

Special Report: Plant Design, Engineering and Construction

Optimize relief loads with dynamic simulation

Pressure relief analysis is a critical task at the engineering design stage of a grassroots oil refinery project. Relief loads must be determined so that the process units and plant flare systems can be designed.

Xie, C. L., Wang, Z. G., CPECC East China Design Branch; Qin, Y. F., SimTech Beijing Ltd.

Pressure relief analysis (PRA) is a critical task at the engineering design stage of a grassroots oil refinery project. During that phase, the relief loads must be determined so that the process units and plant flare systems can be designed. The key steps of PRA include the determination of individual relief loads and the evaluation/mitigation of each process unit’s overall relief load. Individual relief normally refers to a single piece of equipment or a set of interconnected equipment systems, such as a distillation column protected with a pressure relief valve (hereafter referred to as a “protected system”). A conventional method based on recommended practices and stand

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