.... With the consideration of the existing research work carried out from the literature survey, the hybrid HAZOP study is proposed and demonstrated with a case study from petrochemical industry. In section 2, we discuss the new proposed methodology for risk ranking with fuzzy weighed geometric mean. Section 3 deals...

..., an event that the petrochemical industry tries to avoid for several reasons, including: decrease in the generation of revenues: the unplanned stoppage would cause loss of production and, consequently, significant financial losses; the unplanned shutdown would put a chemical plant or refinery...