LNG propulsion guide from ABS

16 Dec 2005

The surge in liquefied natural gas (LNG) carrier newbuildings and the accompanying development of a new generation of these specialized ships has generated interest in alternative propulsion systems. These alternatives are addressed in the new ABS Guide for Propulsion Systems for LNG Carriers, the first such comprehensive set of standards to have been issued by a classification society.

The new ABS Guide provides comprehensive criteria for the various propulsion systems currently on offer from shipyards: dual fuel gas turbine/steam turbine combined cycle with electrical propulsion, dual fuel diesel electrical propulsion and slow speed diesel direct drive as well as conventional steam turbines. The ABS Guide includes detailed criteria for the plant design, piping, electrical systems, construction materials, compressors, pumps and separators.

Additionally, the document offers guidance with regard to the placement of propulsion systems in the overall vessel arrangement scheme as well as refrigeration systems and redundancy systems required if there is an equipment failure. ABS will offer four different notations for those following the design criteria and construction standards set forth within the guide. They are: RELIQ for re-liquefaction unit design; GCU for gas combustion unit; DFD for dual fuel diesel engine power plant; and DFGT for dual fuel gas turbine power plant.

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