Operational precautions for chemical tankers are vitally important in reducing the potential threat to
shipboard crew by products carried. This paper enhances the International Safety Management (ISM)
code in compliance with Occupational Health and Safety Management Systems (OHSAS 18001:2007)
requirements in respect to operational constraints related to chemical tankers. As research methodology,
Fuzzy Axiomatic Design (FAD) and Analytic Hierarchy Process (AHP) are referred to redesign the
extended ISM code procedure, which identifies key points for occupational accident prevention on board
chemical tankers. To illustrate the expected benefits of an extended ISM code procedure, the principle
root causes of chemical tanker explosion are also discussed. In particular, the main results of the case
study highlight the urgent need to ensure the competency of shipboard personnel and their familiarization
with the characteristics of chemical cargos under differing circumstances. The outcomes set out in
this paper contribute to regulatory compliance and to the management of occupational health and safety
requirements on board chemical tankers.