| DAEWOO SHIPBUILDING & MARINE ENGINEERING CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120017608 | UNLOADING OF LNG FROM LNG TANK - Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut-off pressure. The cut-off pressure is from about 0.3 bar to about 2 bar. | 01-26-2012 |
| 20110277497 | METHOD AND APPARATUS FOR PROCESSING HYDROCARBON LIQUEFIED GAS - A method and apparatus for processing natural gas composed of various hydrocarbon components for transportation of the natural gas to a demand side without separation of the hydrocarbon components, such that the natural gas can be used by consumers after being separated into the hydrocarbon components according to the needs of the demand side. The apparatus includes a storage tank and a hydrocarbon liquefied gas mixture accommodated in the storage tank. The mixture has hydrocarbon components composed of methane, ethane, propane and butane, and is produced by liquefying raw natural gas without changing the relative ratio of methane, ethane, propane and butane in the raw natural gas immediately after extraction from the gas well. The method and apparatus can be applied to floating marine structures. | 11-17-2011 |
| 20110108129 | SYSTEM AND METHOD FOR DECREASING VOC IN CRUDE OIL TANKER - A system for decreasing volatile organic compounds (VOC) in a crude oil tanker includes: a supply pipe horizontally installed over a crude oil storage tank of the crude oil tanker and having an end connected to a crude oil storage tank on land; a load pipe vertically connected to a bottom surface of the supply pipe, vertically passing through the crude oil storage tank of the crude oil tanker, and communicating with a lower part of the crude oil storage tank; a distribution pipe horizontally connected to a lower end of the load pipe; and a pressure control unit installed at a lower end portion of the load pipe. | 05-12-2011 |
| 20110061578 | ROLL SUPPRESSION DEVICE FOR OFFSHORE STRUCTURE - The present disclosure relates to a roll-suppression device for an offshore structure. The device includes a damping plate separated downward from a hull to be placed below a bottom of the offshore structure by a connection unit, so that the width of the damping plate may be effectively enlarged without occurrence of collision during shuttle docking or ship-to-ship operation. Accordingly, the device may maximize roll-suppression, as compared with a bilge-keel or a step, and a detachable design of the device facilitates ship construction or shore operation inside a drydock. | 03-17-2011 |
| 20100122542 | METHOD AND APPARATUS FOR ADJUSTING HEATING VALUE OF NATURAL GAS - Disclosed is a method and apparatus for adjusting heating value of natural gas, wherein components having high heating value are separated from natural gas consisting of various hydrocarbon components to reduce heating value of natural gas supplied to the markets. The method includes heating liquefied natural gas (LNG), separating the LNG heated and partially gasified into a gaseous component having low heating value and a liquid component having high heating value. | 05-20-2010 |
| 20100058780 | Liquefied Gas Storage Tank and Marine Structure Including the Same - The present disclosure relates to a liquefied gas storage tank and a marine structure including the same. The storage tank includes a plurality of liquefied gas storage tanks received in a plurality of spaces defined in a hull of the marine structure by a cofferdam and arranged in two rows. The cofferdam includes at least one longitudinal cofferdam extending in a longitudinal direction of the hull and at least one transverse cofferdam extending in a transverse direction of the hull. Each of the storage tanks is sealed and thermally insulated by a sealing wall and a thermal insulation wall extending without being disconnected. The longitudinal cofferdam supports load of an upper structure while suppressing a sloshing phenomenon. | 03-11-2010 |
| 20100012015 | STORAGE TANK CONTAINING LIQUEFIED NATURAL GAS WITH BUTANE - Disclosed is a liquefied natural gas composition. The composition contains methane, ethane and propane and butane. The composition contains a substantial amount of butane while being substantially free of hydrocarbon molecules larger than butane. | 01-21-2010 |
| 20090293506 | Semi-Submersible Offshore Structure Having Storage Tanks for Liquified Gas - Disclosed herein is a semi-submersible offshore structure having storage tanks for liquefied gas, which is constructed so as to improve workability in marine offloading of the liquefied gas stored in the storage tanks while reducing an influence of sloshing. The offshore structure is anchored at sea and has liquefied gas. The offshore structure includes a storage tank storing liquefied gas, a plurality of columns partially submerged under the sea level and each having the storage tank therein, and an upper deck located on the plurality of columns to connect the columns to each other. | 12-03-2009 |
| 20090266086 | FLOATING MARINE STRUCTURE HAVING LNG CIRCULATING DEVICE - Disclosed is an apparatus for containing LNG. The apparatus includes an LNG tank containing liquid phase LNG and boil-off gas of LNG, and an circulating device. The circulating device includes an intake port and a discharge port. The circulating device further includes an flowing pathway from the intake port to the discharge port that does not include a forced LNG liquefying device. The intake port is located in an upper portion of the LNG tank, and the discharge port is located in a lower portion of the LNG tank substantially lower than the intake port. The circulating device is configured to suction, through the intake port, boil-off gas from the upper portion of the LNG tank and to discharge boil-off gas, through the discharge port, to the lower portion of the LNG tank. | 10-29-2009 |
| 20090259081 | METHOD AND SYSTEM FOR REDUCING HEATING VALUE OF NATURAL GAS - Disclosed is a system for reducing a heating value of natural gas. The system includes a heat exchanger to liquefy a portion of components having high heating values, a gas-liquid separator to separate the liquefied component, and a nitrogen adding mechanism to add nitrogen to remaining non-liquefied components. The system includes an additional heat exchanger to cool and liquefy the remaining non-liquefied components after the gas-liquid separator separates the liquefied component from the natural gas. The heat exchangers employ cold heat generated upon regasification of LNG. The system can reduce the heating value of natural gas composed of a variety of hydrocarbon components according to requirements of a place of demand by separating the component with the higher heating value from the natural gas to allow the separated component to be used as fuel, thereby reducing an overall size and operating costs of the system. | 10-15-2009 |
| 20090249799 | APPARATUS AND METHOD FOR INCREASING EFFICIENCY OF A GAS TURBINE AND A MARINE STRUCTURE HAVING THE SAME - An apparatus and method for increasing efficiency of a gas turbine and a marine structure having the gas turbine are disclosed. The marine structure has a cargo tank for storing cryogenic liquefied natural gas (LNG) and a gas turbine for generating electric power. The marine structure further includes a heat exchanger to cool air for combustion supplied to the gas turbine using a cold source or cold heat of the LNG stored in the cargo tank, a heat transfer medium circuit to indirectly transfer the cold source of the LNG stored in the cargo tank to the heat exchanger, and a heater to heat a heat transfer medium having undergone heat exchange with the air for combustion while passing through the heat exchanger. The temperature of air supplied to the gas turbine is lowered using the cold source generated upon regasification of LNG in the marine structure, thereby increasing the efficiency of the gas turbine. | 10-08-2009 |
| 20090249798 | APPARATUS AND METHOD FOR INCREASING EFFICIENCY OF A GAS TURBINE AND A MARINE STRUCTURE HAVING THE SAME - An apparatus and method for increasing efficiency of a gas turbine and a marine structure having the gas turbine are disclosed. The marine structure includes an ambient LNG vaporizer for regasifying cryogenic LNG via heat exchange with air and the gas turbine for generating electric power. The marine structure includes a moist-air mixing chamber disposed at an upstream side of the gas turbine, a condensed-water nozzle to spray condensed water, generated from air during the heat exchange in the LNG vaporizer, into the moist-air mixing chamber; and a cold air supply pipe to supply air, cooled by the heat exchange in the LNG vaporizer, to the gas turbine via the moist-air mixing chamber. The method reduces the temperature of air supplied to the gas turbine by condensed water or cold air generated during regasification of LNG through the ambient vaporizer in the marine structure, thereby increasing the efficiency of the gas turbine. | 10-08-2009 |
| 20090233500 | FLOATING STRUCTURE HAVING PROPULSIVE DEVICES FOR MOVING THE SAME WHILE SAILING AND MOORING - Disclosed is a floating system. The floating system comprises a floating body, a first propeller and a second propeller. The first propeller is pivotally secured to the floating body. The second propeller is pivotally secured to the floating body and distanced from the first propeller in a first direction and in a second direction perpendicular to the first direction. The first and second directions are generally parallel to a surface of water on which the floating system floats. | 09-17-2009 |
| 20090218354 | LIQUEFIED NATURAL GAS STORAGE TANK FOR FLOATING MARINE STRUCTURE - Disclosed is a floating marine apparatus including a liquefied natural gas (LNG) tank. The apparatus includes a first LNG containing compartment and a second LNG containing compartment next to the first compartment. The apparatus further includes a bottom passage interconnecting bottom portions of the first and second compartments for fluid communication therebetween. | 09-03-2009 |
| 20090211262 | LNG TANK SHIP HAVING LNG CIRCULATING DEVICE - Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut off pressure. The cut off pressure is from about 0.3 bar to about 2 bar. | 08-27-2009 |
| 20090199759 | STORAGE TANK CONTAINING LIQUEFIED NATURAL GAS WITH BUTANE - Disclosed is a liquefied natural gas composition. The composition contains methane, ethane and propane and butane. The composition contains a substantial amount of butane while being substantially free of hydrocarbon molecules larger than butane. | 08-13-2009 |
| 20090199591 | LIQUEFIED NATURAL GAS WITH BUTANE AND METHOD OF STORING AND PROCESSING THE SAME - Disclosed is a liquefied natural gas composition. The composition contains methane, ethane and propane and butane. The composition contains a substantial amount of butane while being substantially free of hydrocarbon molecules larger than butane. | 08-13-2009 |
| 20090173727 | Butt-joint Welding Method - A butt-joint welding method is disclosed, which is capable of improving welding productivity by reducing the number of welding passes by weaving a welding wire in submerged arc welding. The welding method includes arranging two parent metals having 10-35 mm thickness at an interval of 8-20 mm to face each other, attaching a backing material to rear sides of the two parent metals, the rear sides facing each other, so that the backing material seals a space between the parent metals through surface-contact with the rear sides, performing flux cored arc welding or compositely performing the flux cored arc welding and submerged arc welding 1-3 times on an upper layer of the backing material, and welding the two parent metals while weaving a submerged arc welding wire transversely. | 07-09-2009 |
| 20090133674 | FUEL GAS SUPPLY SYSTEM AND METHOD OF AN LNG CARRIER - A fuel gas supply system of a vessel, such as an LNG carrier, is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. In one embodiment, the system includes a boil-off gas reliquefaction apparatus for reliquefying boil-off gas generated in the LNG tank. | 05-28-2009 |
| 20090126704 | FUEL GAS SUPPLY SYSTEM AND METHOD OF AN LNG CARRIER - A fuel gas supply system of a vessel, such as an LNG carrier, is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. In one embodiment, the system is operated to supply fuel to an MEGI engine. | 05-21-2009 |
| 20080308175 | Method and Apparatus for Treating Boil-Off Gas in an LNG Carrier Having a Reliquefaction Plant, and LNG Carrier Having Said Apparatus for Treating Boil-Off Gas - Disclosed are a method and an apparatus for treating boil-off gas generated in an LNG storage tank of an LNG carrier for transporting LNG in a cryogenic liquid state, the LNG carrier having a boil-off gas reliquefaction plant, wherein an amount of boil-off gas corresponding to a treatment capacity of the reliquefaction plant among the total amount of boil-off gas generated during the voyage of the LNG carrier is discharged from the LNG storage tank and reliquefied by the reliquefaction plant. The boil-off gas treating method and apparatus can maintain an amount of boil-off gas discharged from an LNG storage tank at a constant level by storing in the LNG storage tank, instead of discharging and burning, surplus boil-off gas which has not been returned to the LNG storage tank through the reliquefaction plant among the total amount of boil-off gas generated in the LNG storage tank, and can prevent waste of boil-off gas and save energy by allowing an internal pressure of the LNG storage tank to be increased. | 12-18-2008 |
| 20080295527 | LNG TANK SHIP WITH NITROGEN GENERATOR AND METHOD OF OPERATING THE SAME - Disclosed is an apparatus for producing nitrogen equipped in a marine structure such as a liquefied natural gas regasification vessel (LNG RV) and a floating storage and regasification unit (FSRU), and a method for producing nitrogen in a marine structure using the apparatus. The apparatus for producing nitrogen equipped in a flowing marine structure produces nitrogen to be mixed with natural gas to be supplied to consumers after regasification. The floating marine structure in which the apparatus is equipped has an LNG regasification facility for compressing the LNG stored in a storage tank using a high-pressure pump and then vaporizing the LNG into natural gas in a vaporizer to supply natural gas to consumers. The apparatus for producing nitrogen secures cold heat necessary to produce nitrogen using the LNG supplied from the storage tank. | 12-04-2008 |
| 20080276628 | FUEL GAS SUPPLY SYSTEM AND METHOD OF AN LNG CARRIER - A fuel gas supply system of an LNG carrier is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. | 11-13-2008 |
| 20080276627 | FUEL GAS SUPPLY SYSTEM AND METHOD OF A SHIP - A fuel gas supply system of a ship is provided for supplying fuel gas to a high-pressure gas injection engine of the ship, wherein the ship has an LNG fuel tank for storing LNG as fuel and LNG is extracted from an LNG fuel tank of the ship, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. | 11-13-2008 |
| 20080209908 | APPARATUS AND METHOD FOR LIQUEFIED NATURAL GAS CARRIER PROPULSION - Disclosed herein is an apparatus and method for liquefied natural gas (LNG) carrier propulsion. In the apparatus and method, the propulsion of an LNG carrier is done by only a single main diesel engine and has construction to promptly cope with emergencies caused by malfunction of the main diesel engine. The propulsion apparatus for an LNG carrier comprising a boil-off gas re-liquefaction apparatus for re-liquefying boil-off gas generated in LNG storage tanks to return re-liquefied boil-off gas back to the LNG storage tank comprises a single main diesel engine, a propulsion shaft separably connected to the main diesel engine, and an electric motor for propulsion separably connected to the propulsion shaft and supplied with power intended for operation of the boil-off gas re-liquefaction apparatus. | 09-04-2008 |
