The ship's engine room contains a wide range of equipment and systems such as main engines, generators, pumps, valves, heat exchangers, fuel systems, cooling systems, and more similar systems. Such a range of equipment requires the cooperation of workers from various professions when equipping the engine room itself. Therefore, the engine room fitting involves: pipefitters, welders, electricians, sheet metal workers, insulators, ship mechanics, carpenters, masons, inspectors, and controllers. To carry out the outfitting of the third platform of the ship's engine room for chemical transportation, in this work, we have come to the optimal version of outfitting through four different cases. Each case consisted of the same activities: foundation assembly, machinery and equipment assembly, welding, pipefitting, electrical work, sheet metal work, insulation work, and testing and control of the same. The main variable we changed was the number of workers on each activity. This gave us different results in terms of duration and equipment costs. The aim was to study the impact of certain variables in order to reach the optimum. We started with the given values obtained by consulting with the mentor and thus made the first case of equipping. The first and second variations were attempts to show two extremes, two opposite cases in which the goal of the first case was to achieve an outfitting process with the shortest total activity duration, and the second to get a cheaper process. Only with the last case did the optimization of the given variables begin in an attempt to reduce both costs and activity duration, which we succeeded in.