Challenges of LNG Carriers, Propelled by New Propulsion Systems. Ship Builder’s Viewpoint (eBook)

Published Date

January 2006

Challenges of LNG Carriers, Propelled by New Propulsion Systems. Ship Builder’s Viewpoint (eBook)

(Excludes any applicable taxes)

This is a study on the availability, control, and safety issues of conventional and proposed propulsion systems, including a description of terms. (20pp)

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This study investigated the availability, control, and safety issues of the conventional and prospective propulsion systems for LNG carriers: the dual-fuel steam turbine mechanical (DFSM), the dual-fuel diesel electric (DFDE), the dual-fuel gas turbine electric (DFGE), the dual-fuel diesel mechanical (DFDM), and the diesel mechanical propulsion with reliquefaction (SFDM+R). The two prospective candidates,the DFDM and DFGE, exhibited the availabilities of design and emergency propulsion loads around 0.95, as high as the newly adopted DFDE and SFDM+R while the DFSM demonstrated the highest.

All the propulsion systems achieved a satisfactory level of the availability for the BOG utilization since most machinery equipment of the BOG treatment system was designed with full redundancy. The fuel gas pressure should be controlled appropriately not to cause short-term fluctuations which may cause the dual-fuel engines to shift to the liquid fuel mode, effectively resulting in the shutdown of the fuel gas supply. Though its controllability was demonstrated for the DFDE in a recent onboard test, it should be proven that the fuel gas pressure will be controllable for sudden changes in the fuel gas demand for actual ship operations.

The overestimated boil-off rate caused the fuel gas supply system to operate off the best efficiency point and seemed to increase both the capital and operating expenses. The excessive BOG expected just after the LNG loading into the warm cargo tanks did not seem to cause serious trouble if the cargo tank pressure was kept low after the loading. The hazards of each propulsion system could be mitigated by the safety requirements of the international and classification society. Estimation of the probability of leak, fire and explosion revealed that the frequencies were acceptable compared with other industries.

Paper Delivered by:
Daejun Chang
Taejin Rhee
Kiil Nam
Kwangpil Chang
Donghun Lee
Byungjin Kwak
(all of Hyundai Heavy Industries, Co., Ltd)

Prepared for:
Gastech Abu Dhabi 2006

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: Challenges of LNG Carriers, Propelled by New Propulsion Systems. Ship Builder’s Viewpoint (eBook)
Product Code: 4433G118
Published Date: January 2006

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