Vol. 50 No. 2 (2013)   Shipbuilding and Ocean Development
Technical Papers

The Best LNG Carrier for the Environment SAYAENDO UST:
Capable of Gas-Only Combustion in All Operations

KENJI TSUMURA
TOSHINORI ISHIDA
KAZUYOSHI HIRAOKA
KAZUSHI KUWAHATA
AKINORI HAMAJIMA

In response to the recent trend towards progressively more stringent environmental regulations for exhaust emissions from vessels, liquefied natural gas (LNG)‐fueled vessels have started to emerge. As LNG carrier vessels fitted with steam turbine propulsion plant produces a low level of nitrogen oxide (NOx), they can stay ahead of planned NOx and sulfur oxide (SOx) emission regulations by using the LNG cargo as the fuel source. However, such LNG carriers currently adopt the dual‐fuel combustion method (gas and fuel oil) in order to achieve a stable load following while maneuvering operation, where significant load fluctuations occur. This article describes new gas‐only combustion technology that enables safe maneuvering operation with superior economic efficiency.