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

Elidolu G., Uflaz E., AYDIN M., ÇELİK E., Akyüz E., Arslan Ö.

OCEAN ENGINEERING, vol.266, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 266
  • Publication Date: 2022
  • Doi Number: 10.1016/j.oceaneng.2022.113082
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Computer & Applied Sciences, Environment Index, ICONDA Bibliographic, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Risk assessment, Intuitionistic fuzzy TODIM, Gas freeing, Oil, chemical tankers, DECISION-MAKING, FUZZY, TODIM, FRAMEWORK, HAZARD, SAFETY, TURKEY, MODEL
  • Recep Tayyip Erdoğan University Affiliated: Yes


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.