Critical path diagrams optimize FCC start-ups

05/12/2003
James D. WeithPractical Enginuity, Mission Viejo, Calif.Critical path diagrams, which have evolved from logic diagrams, can help refiners optimize the timing of FCC start-ups. Those start-ups require that certain steps occur simultaneously before feed goes to the riser.This required timing or coordination is why establishing a critical path is valuable; it helps remove some of the inefficiencies from the individual steps for each section, so that the ultimate timing between them can be better synchronized.Logic diagrams illustrate the necessary sequences for starting an FCC. These logic diagrams then become the basis for the critical path diagram.While critical path diagrams are valid for...
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