TANK STATE ESTIMATION METHOD AND TANK STATE ESTIMATION PROGRAM

摘要

Provided is a tank state estimation method for estimating a state in a tank of an LNG ship, which has LNG stored in the tank as its cargo, at a predetermined time point on a course of the LNG ship. The tank state estimation method executes: a first step for acquiring information on specifications of the tank; a second step for acquiring information on a state in the tank at a start point in a target section on the course; a third step for acquiring information on a meteorological forecasting value in the section and on a liquid oscillation predicted value of LNG in the tank in the section, which is determined on the basis of the information on the meteorological forecasting value; and a fourth step for calculating, on the basis of the information acquired in the first to third steps, a state in the tank at an end point in the section by heat-transfer calculation based on thermodynamics, on the assumption that heat input to the tank in the section is used to vaporize LNG in the tank.