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Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-02-22

The present invention provides an apparatus and a method for high deposition welding a horizontal butt joint which can form a high deposition welded part while forming a root part when high deposition welding is carried out relative to a bevel in case of automatic welding of a horizontal butt joint, thereby achieving high deposition welding without any defect of the inside and surface of a welded cross section and reducing the number of welding passes. The horizontal butt joint high deposition welding apparatus is installed on a traveling device part in a welding direction by a welding tip so as to move in a forward direction of welding progress and a horizontal butt joint high deposition welding method, thereby preventing the molten metal from running down, allowing a user to easily handle the apparatus, reducing weight, and completing surface beads because a lower part is filled with molten metal.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-01-04

Disclosed herein is a boil-off gas treatment system. The boil-off gas treatment system includes a compressor compressing boil-off gas generated in an LNG storage tank of a ship or a floating structure, a heat exchanger cooling the compressed boil-off gas through heat exchange with boil-off gas to be supplied to the compressor, an expansion unit performing adiabatic expansion of the boil-off gas cooled by the heat exchanger, a gas-liquid separator performing gas/liquid separation of the boil-off gas subjected to adiabatic expansion by the expansion unit and supplying liquefied natural gas to the LNG storage tank, and a bypass line through which the boil-off gas subjected to adiabatic expansion is supplied from a downstream side of the expansion unit to a downstream side of the gas-liquid separator.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-03-08

Disclosed herein is a fuel gas supply system (FGSS) of a ship supplying natural gas to an engine as fuel. The fuel gas supply system of a ship may include: a cargo tank storing a liquid cargo; a vent mast connected to the cargo tank; a fuel supply line connected to the engine to supply fuel; and a vent line connected to the fuel supply line, in which the vent line may be connected to the vent mast.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-01-04

Disclosed are a boil-off gas treatment system and method. The boil-off gas treatment system includes: a compressor compressing boil-off gas generated in a storage tank provided to a ship or a marine structure; a compressed gas heat exchanger disposed downstream of the compressor and performing heat exchange of the compressed boil-off gas with seawater or fresh water; and a boil-off gas heat exchanger disposed downstream of the compressed gas heat exchanger and performing heat exchanged of the compressed boil-off gas with boil-off gas to be supplied to the compressor.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-05-10

The present invention relates to a liquefied natural gas (LNG) storage tank having slits in the upper and lower portions of a first insulating wall, and to an insulating wall for an LNG storage tank. One embodiment of the present invention provides a storage tank for storing LNG therein, comprising: a first sealing wall coming into contact with the LNG stored in the storage tank, for liquid-tight sealing the LNG; and a first insulating wall disposed below the first sealing wall, for insulating the LNG, wherein the first insulating wall has a plurality of first slits in the upper portion thereof and a plurality of second slits in the lower portion thereof.


The present invention relates to: a liquefied natural gas (LNG) storage tank, which has insulating wall securing devices for the LNG storage tank installed at the optimum position, thus is stable with respect to thermal contraction, and may require a minimum number of insulating wall securing devices; and an insulating wall securing device for an LNG storage tank. One embodiment of the present invention provides a storage tank for storing LNG therein, comprising: a first sealing wall coming into contact with the LNG stored in the storage tank, for liquid-tight sealing the LNG; a first insulating wall disposed below the first sealing wall, for insulating the LNG; a second insulating wall disposed in the inner wall of the storage tank, for insulating the LNG; a plurality of first insulating wall securing devices for securing the first insulating wall and the second insulating wall, wherein the plurality of first insulating wall securing devices are provided at the vertex of the first insulating wall.


Patent
Daewoo Shipbuilding, Marine Engineering and Transocean | Date: 2016-12-14

Provided is a locking apparatus for a damping device of a moonpool, which can automatically lock and unlock an opened state of the damping device of the moonpool. The locking apparatus includes: one or more first locking members installed in a sidewall of the moonpool; one or more second locking members installed in a side of the damping device; and a holding unit separably holding the first locking members and the second locking members when the damping devices are in the opened state.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-05-24

Disclosed is a method for operating an engine for a vessel including an engine which can use both natural gas and fuel oil as fuel. According to the method for operating an engine for a vessel, each engine is operated in one of modes including: a gas mode in which the engine is driven using natural gas as fuel; a fuel oil mode in which the engine is driven using fuel oil as fuel; and a fuel distribution mode in which the engine simultaneously uses natural gas and fuel oil as fuel.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-06-07

The present invention relates to a system and a method for supplying fuel and, more particularly, to a system and a method for supplying fuel, characterized in that LNG is pumped and supplied to a ship engine and, when the internal pressure of a pressure-resistant tank rises above the necessary pressure of the ship engine, the BOG is supplied to the ship engine, thereby controlling the internal pressure of the pressure-resistant tank, and an eductor is arranged at a point, at which lines that supply LNG and BOG join with each other, upstream of the ship engine such that the lines that supply LNG and BOG can be controlled simultaneously.


Patent
Daewoo Shipbuilding and Marine Engineering | Date: 2017-06-07

A fuel supply control system and control method are disclosed. In a fuel supply control system of a high-pressure gas injection engine provided in a ship or an offshore structure, the fuel supply control system of the present invention includes: a gas supply mode for supplying gas to the high-pressure gas injection engine through a gas supplying part for receiving LNG from a storage tank so as to compress and vaporize the LNG; and an oil supply mode for supplying oil as fuel to the high-pressure gas injection engine, wherein the mode is switched into the oil supply mode during an emergency including a device malfunction in the gas supply mode such that the oil supply mode can be configured as a redundancy of the gas supply mode.

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