Maintenance management method for a ship

A method for managing ship maintenance, comprising the steps of:

• providing a ship including a plurality of sealed and thermally insulating tanks for transporting liquefied gas, each tank having a geometry and a position on the ship;
• the ship being a ship transporting natural gas, a methane tanker or an anchored storage ship,
• providing a management system configured to communicate with the ship, the management system having a central processor unit and a plurality of sensors, the central processor unit being-in communication with the sensors of the ship;
• for each tank of the plurality of tanks, executing instructions of the central processor unit of the management system, including:
• determining a current filling level of liquefied gas in the tank,
• determining a current state of movement of the ship,
• determining a current sloshing index IBi from the current filling level of the tank and the current state of movement of the ship, taking into account the position and the geometry of the tank, wherein the current sloshing index IBi is obtained by reading a value in a multiple entry correspondence table, an entry corresponding to the filling of the tank, at least one entry corresponding to the current state of movement of the ship and the read value representing a probability of deterioration of the tank when it is subjected to the current state of movement of the ship,
• integrating the determined current sloshing index IBi into a wear index IUi representing a probability of damage to the tank that takes into account a history of sloshing indices, and
• determining that a tank of the plurality of tanks needs to be inspected by determining comparing the wear index of the tank reaches a threshold;
• in which the threshold corresponds to a wear index of another tank in order to indicate that an inspection of the tank that has the highest wear index (Max (IUi)) must be carried out,
• the method further comprising:
• carrying out inspection of the tank that has the highest wear index (Max (IUi)), wherein the inspection of the tank comprises carrying out complete draining of the tank,
• wherein, after inspection of the tank that has the highest wear index (Max (IUi)), and if the tank is damaged then determining a next tank that must be inspected as being the tank having the highest wear index of remaining tanks,
• wherein, after inspection of the tank that has the highest wear index (Max (IUi)), and if the tank is not damaged, then determining that none of the remaining tanks must be inspected and draining none of the remaining tanks.