Liquified natural gas (LNG) is widely considered to be a leading alternative marine fuel as the maritime industry has been going towards a green and sustainable direction. The paper focuses on the retrofit of a 10,000 TEU container ship to operate on LNG fuel instead of oil fuel. A compact bi-lobe IMO type C LNG fuel tank and skid-mounted fuel gas supply system (FGSS) were designed.
The investigation described in this paper indicates that the retrofit of a 10,000TEU container ship to operate on LNG fuel is technical feasible through the selection of the appropriate LNG storage tank and FGSS and the configuration of the engine room to gas safe type. To achieve these aims of optimizing the arrangement of LNG fuel tank and fuel gas supply system (FGSS) to minimize loss of container slots and shortening the construction period to reduce out-of-service time of the ship. The concepts of compact design and skid-mounted design were developed. A compact bi-lobe IMO type C LNG fuel tank was located in a retrofitted fuel storage hold space, skid-mounted FGSS in a TCS and a FPR were located on the open deck. The storage tank, TCS and FPR occupy a total of 336 TEU container spaces. The advantages of adopting type C tanks and FGSS can be reflected in many aspects such as suitable BOR, acceptable space utilization, stronger structural safety, flexible maintenance and modification and competitive cost-effectiveness.