HAZOP Study and Safety Layers of Protection Analysis in Delayed Coker Unit

Abstract

HAZOP study and Safety Layers of Protection Analysis were performed upon Delayed Coker Unit in order to proactively and systematically identify, evaluation, and mitigation or prevention of chemical releases that could occur as a result of failures in process, procedures, or equipment in delayed coker unit.

purpose of HAZOP study was to identify the potential critical effects due to the deviation of the process to people, environment and assets. The purpose of the LOPA was to assess the SIL (Safety Integrity Level) requested for safety instrumented function identified during the HAZOP.

Hazards and Operability Analysis & Layer of Protection Analysis should be integrated for safety management. As the HAZOP study alone is used to To identify hazards (HAZ) and operability (OP) issues but not a design check or provide design alternative, and Not an optimization study. (Steven T. Maher Max C. Oppedahl &, 2018)

Inappropriate SIL determination in delayed coker unit can affect the safety integrity of the asset protection envelope and unnecessary capital and operational spending. in contrary, properly determined SIL levels resulting in cost improvements. Companies that real practice PHA are finding a continuing reduction in frequency and severity of industrial accidents.