The compulsory installation of ballast water treatment systems on oceangoing ships has recently been introduced in order to protect the ecosystem of marine life. Upon installing the treatment system according to this new rule, in terms of existing ships currently in service, it is desirable to minimize the influence of the installation on normal operations. The installation of this system, in which a great deal of steel engineering, plumbing and wiring is required, is hard to complete within the period when a ship is docked for a regular checkup. However, by utilizing various measurements and computer‐aided design (CAD), and by implementing advanced preparation and preliminary work, the installation was completed within the desired work period without interference with the ship's normal operations.
