Numerical risk analysis of gas freeing process in oil/chemical tanker ships

Gas freeing is one of the most hazardous and critical operations on oil/chemical tankers. The process aims to remove toxic gases from tanks and bring oxygen to a healthy level (21%) in the tank atmosphere. Significant shipboard operations such as hot work or entry into the tank after tank cleaning require a successful gas-freeing process; otherwise, the consequences may be devastating for human life, cargo, ship, and the marine environment. Therefore, proactive planning and comprehensive risk assessment are essential to enhance operational safety onboard tanker ships. In this study, the potential hazards of the gas-freeing process are evaluated under the Fine-Kinney based intuitionistic fuzzy TODIM (Tomada de Decisa similar to o Interativa e Multicrite ' rio) approach. While the Fine Kinney and TODIM methods are used for calculating the risk score with the probability, exposure, and consequence parameters and determining the risk priority, intuitionistic fuzzy sets (IF) help to overcome uncertainty in human decision-making. The research findings are anticipated to guide maritime professionals, safety inspectors, and shipboard personnel in enhancing the gas-freeing process's safety and potential mitigating risks on oil/chemical tanker ships.

Automated summary

Gas freeing is a hazardous and critical operation on oil/chemical tankers, and its successful implementation is crucial for ensuring safety and preventing environmental disasters. This study evaluates the potential hazards of the gas-freeing process using the Fine-Kinney and TODIM methods, and overcomes decision-making uncertainty with the use of intuitionistic fuzzy sets. The research findings are expected to guide professionals in enhancing the safety of the gas-freeing process and mitigating risks.