Installing a ballast water treatment system on an existing vessel is typically more complicated than on a new build. Ballast water treatment was not considered during the original construction of most vessels, and as a result, there is no dedicated space for the new system. This means that the installation needs to be adapted to existing circumstances on board.
High flexibility, thorough preparation and strong cooperation from all partners are all necessary for a successful retrofit installation. Installing a ballast water treatment system affects many on board systems, each of which has its own specific considerations. The typical dockyard timeframe for a retrofit is two weeks, and any delay means lost income for the vessel owner.
A retrofit is not simply the installation of new equipment, but the addition of a complete system that will demand a new way of managing ballast water. It therefore requires updates to the Ballast Water Record Book, as well as the Ballast Water Management Plan. Moreover, the implementation of new procedures will likely entail training for the crew.