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Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2015-04-21

A liquefied gas treatment method for a vessel is performed by a liquefied gas treatment system for the vessel including a cargo tank storing LNG, and a main engine and a sub engine using the LNG stored in the cargo tank as fuel. The liquefied gas treatment system includes a compressor line configured to compress BOG generated in the cargo tank by a compressor and supply the compressed BOG to the engines as fuel, and a pump line configured to compress the LNG stored in the cargo tank by a pump and supply the compressed LNG to the engines as fuel. In a laden condition in which an amount of the LNG stored in the cargo tank is larger than in a ballast condition, the BOG generated in the cargo tank is supplied as fuel to at least one of the engines through the compressor line.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2014-02-11

A butt joint welding apparatus and method are provided. The apparatus comprises a traveling device part to convey a welding tip vertically or slantingly to the bevel of upper and lower parent metal. A welding torch with a welding tip is mounted in the traveling device part. A copper shoe device is mounted in the traveling device part and positioned in the direction of welding by the welding tip for ejecting a gas to the molten metal in the direction reverse to the welding direction. A control unit controls the welding condition according to the positions of the bevels of the butt joint welding. The control unit enables the traverse device part to be conveyed along a particular weaving pattern, and controls the welding current and voltage, the wire supply speed, the traverse speed, and the stopping time at the nodal points in the moving interval between adjacent nodal points.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2015-03-16

A system for supplying fuel to an engine of a ship. The system includes a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine, a hydraulic motor driving the high pressure pump and a chamber carrying the high pressure pump and the hydraulic motor. The chamber is substantially free of electric sparks.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2014-10-23

Disclosed herein are an apparatus and a method for supplying a fuel to an engine of a ship. The apparatus for supplying a fuel to an engine of a ship includes: a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine; a hydraulic motor driving the high pressure pump; and a lubricating pump supplying lubricating oil to the high pressure pump.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2014-06-26

In a BOG treatment system, boil-off gas (BOG) discharged from a storage tank is compressed, most of the BOG is used as the fuel of vessel engines, and a remaining part of the BOG is liquefied by cold energy of BOG newly discharged from the storage tank and is returned to the storage tank, thereby efficiently utilizing the BOG. The BOG treatment system for a vessel includes a compressor compressing the BOG discharged from the storage tank; a medium pressure gas engine receiving at least a part of the BOG compressed by the compressor, as fuel; a heat exchanger exchanging heat between the remaining part of the BOG, which is not supplied to the medium pressure gas engine as fuel, and the BOG, which is discharged from the storage tank and is not compressed; and an expander decompressing the remaining part of the BOG cooled by the heat exchanger.

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