The concept of an offshore floating, storage and regasification unit(FSRU) has been proposed as alternatives to conventional onshore LNG import terminals. The advantage is that risk to the public is negligible and it could be remobilized at any time. Boil-off gas(BOG) consists of the gas which is produced by the vaporization of a small portion of LNG storage tanks due to ambient heat leak into the storage tanks and their associated pipe works. The other major source of BOG is the gas which is displaced by incoming LNG when a ship is unloaded into the LNG storage tank. In abnormal and emergency operation, the flare system is provided for the safe disposal of hydrocarbon vapors from the LNG-FSRU. The capacity of the flare will be sufficient to handle vapor from operational upset conditions in the storage and vapor handling areas. Simulations have been developed using HYSYS v7.1. This suite of simulations will allow equipment to be sized for the possible BOG handling methods. This study is to determine the optimum method of handling the boil-off gas produced from LNG storage tanks during the operation of LNGFSRU. We quantify the amount of BOG produced in the worst case scenarios while a ship is unloaded and in abnormal and emergency operations.
The concept of an offshore floating, storage and regasification unit has been proposed as alternatives to conventional onshore LNG import terminals. The advantage is that risk to the public is negligible and it could be remobilized at any time.
