Abstract: An exemplary bilobe or multilobe tank for storing liquefied natural gas includes at least two tank sections, each tank section having a curved upper surface and curved bottom surface, the tank sections being joined to each other so that the tank has an undulating upper surface and an undulating lower surface. Each tank section is connected to an adjacent tank section with at least one connecting duct so that a horizontal flow path is formed between the lowermost points of the adjacent tank sections or between the uppermost points of the adjacent tank sections.

Abstract: A marine vessel includes at least one gas fuel consumer is arranged at a first horizontal level in the vessel, and at least one gas tank for the gas fuel consumer is arranged at a second horizontal level in the vessel, which second horizontal level is different from the first horizontal level. The vessel is provided with a fluid passing shaft for providing a confined vertically extending shaft between a gas consumer at a first horizontal level in the vessel and at least one gas fuel tank arranged at a second horizontal level in the vessel.

Abstract: An LNG tank is a single-shell LNG tank having one shell and at least one pipe extending from the LNG tank to a tank connection space of the LNG tank. The shell of the LNG tank is substantially surrounded by insulation. The LNG tank has at least one bellow connection surrounding at least part of the length of the at least one pipe for connecting the at least one pipe extending from the LNG tank to the tank connection space. A system for connecting at least one pipe between an LNG tank and a tank connection space thereof is also provided. At least one pipe extends from the LNG tank to the tank connection space and which LNG tank is a single-shell tank having one shell. The at least one pipe is connected between the LNG tank and the tank connection space by at least one bellow connection.

Abstract: An exemplary bilobe or multilobe tank for storing liquefied natural gas includes at least two tank sections, each tank section having a curved upper surface and curved bottom surface, the tank sections being joined to each other so that the tank has an undulating upper surface and an undulating lower surface. Each tank section is connected to an adjacent tank section with at least one connecting duct so that a horizontal flow path is formed between the lowermost points of the adjacent tank sections or between the uppermost points of the adjacent tank sections.

Abstract: The invention relates to a valve system of a fuel tank, especially of an LNG tank, which valve system includes at least two pressure relief safety valves, in which valve system one pressure relief safety valve is located in one safety valve branch branching from an outlet line from the LNG tank. The valve system further comprises interconnected shutoff valves for shutting off one of the safety valve branches at time and that the shutoff valves are diverter valves with a T-bore.

Abstract: A method for filling a fuel tank with liquefied gas includes liquefied gas being brought into the tank so that gas in introduced to a lower section of the tank below the surface of the liquefied gas in the tank, and during a first phase of the filling procedure while gas is introduced to a lower section of the tank the pressure of the tank is maintained below a predetermined set pressure by spraying of liquefied gas into a gas space in the upper section of the tank above the surface of the liquefied gas in the tank. At a predetermined state of the filling procedure a second phase of the procedure is initiated during which the spraying liquefied gas into a gas space in the upper section of the tank is decreased and the second phase is practiced until a predetermined filling stage of the tank is reached.

Abstract: The invention relates to a valve system of a fuel tank, especially of an LNG tank, which valve system includes at least two pressure relief safety valves, in which valve system one pressure relief safety valve is located in one safety valve branch branching from an outlet line from the LNG tank. The valve system further comprises interconnected shutoff valves for shutting off one of the safety valve branches at time and that the shutoff valves are diverter valves with a T-bore.

Abstract: A method for starting gas delivery from a liquefied gas fuel system includes a fuel tank filled with liquefied gas by a filling procedure and the filling procedure resulting in the pressure in the tank being at least at an operational pressure required by the engine. The method pressure in the tank is controlled by controlling the operation of a pressure build up system including the pressure build up evaporator which is arranged in a conduit leading from the bottom section of the tank to the upper section of the tank. The pressure build up system is controlled by controlling the flow rate of the evaporated gas in the conduit while the heat transfer medium is allowed to flow unconstrained through the pressure build up evaporator.

Abstract: An LNG tank is a single-shell LNG tank having one shell and at least one pipe extending from the LNG tank to a tank connection space of the LNG tank. The shell of the LNG tank is substantially surrounded by insulation. The LNG tank has at least one bellow connection surrounding at least part of the length of the at least one pipe for connecting the at least one pipe extending from the LNG tank to the tank connection space. A system for connecting at least one pipe between an LNG tank and a tank connection space thereof is also provided. At least one pipe extends from the LNG tank to the tank connection space and which LNG tank is a single-shell tank having one shell. The at least one pipe is connected between the LNG tank and the tank connection space by at least one bellow connection.

Abstract: An LNG tank as disclosed can include an inner shell of stainless steel and an outer shell spaced at a distance from the inner shell, the inner and outer shells defining an isolation space therebetween. A double-walled pipe of stainless steel connected to the LNG tank can include an inner pipe. The outer wall of the pipe can be connected to the inner shell by a bellows-like pipe fitting welded to the outer wall of the pipe(s) and to the inner shell of the tank. The inner pipe for extending into a tank room can be connected to a valve in a valve block, and the outer wall of the pipe extending into the tank room can be welded to the valve block to provide a continuous secondary barrier for the inner pipe between the inner shell of the tank and the valve block.

Abstract: A fuel feeding system for storing liquefied gas and feeding gaseous fuel to be used in a piston engine, which fuel feeding system includes at least two cryogenic fuel tank arrangements having a first tank arrangement and a second tank arrangement in connection with each other. The fuel feeding system includes a gaseous fuel feed line connected at its first end to at least one piston engine, in which system the first tank arrangement is provided with a pressure build-up system having a first heat exchanger unit. The inlet of the heat exchanger unit is connected to a bottom section of the first tank arrangement the outlet of which is connectable to the top section of the first tank arrangement. The first tank arrangement and the second tank arrangement are both pressure vessels, and the first tank arrangement is selectively connectable to the fuel feed line by a gas line extending from an outlet in the top section of the first tank arrangement.

Abstract: A method for filling a fuel tank with liquefied gas includes liquefied gas being brought into the tank so that gas in introduced to a lower section of the tank below the surface of the liquefied gas in the tank, and during a first phase of the filling procedure while gas is introduced to a lower section of the tank the pressure of the tank is maintained below a predetermined set pressure by spraying of liquefied gas into a gas space in the upper section of the tank above the surface of the liquefied gas in the tank. At a predetermined state of the filling procedure a second phase of the procedure is initiated during which the spraying liquefied gas into a gas space in the upper section of the tank is decreased and the second phase is practised until a predetermined filling stage of the tank is reached.

Abstract: A method for starting gas delivery from a liquefied gas fuel system includes a fuel tank filled with liquefied gas by a filling procedure and the filling procedure resulting in the pressure in the tank being at least at an operational pressure required by the engine. The method pressure in the tank is controlled by controlling the operation of a pressure build up system including the pressure build up evaporator which is arranged in a conduit leading from the bottom section of the tank to the upper section of the tank. The pressure build up system is controlled by controlling the flow rate of the evaporated gas in the conduit while the heat transfer medium is allowed to flow unconstrained through the pressure build up evaporator.

Abstract: The invention relates to a marine vessel comprising a hull and a propulsion arrangement. The marine vessel is further provided with at least one vertically arranged cylinder (6) with a cylindrical shell and with a first vertical axis (7). The vertically arranged cylinder is adapted to rotate around the first vertical axis. In order to provide a flexibly adaptable arrangement suitable for various operating modes of the marine vessel, the cylindrical shell comprises at least three sections (62, 63, 64) with a curved portion extending between two ends, whereby each of the three sections is arranged to be turnable around a respective second vertical axis (8), which is positioned at the circumference of the cylindrical shell. Each section is arranged to be anchored into a given position.

Abstract: An LNG tank as disclosed can include an inner shell of stainless steel and an outer shell spaced at a distance from the inner shell, the inner and outer shells defining an isolation space therebetween. A double-walled pipe of stainless steel connected to the LNG tank can include an inner pipe. The outer wall of the pipe can be connected to the inner shell by a bellows-like pipe fitting welded to the outer wall of the pipe(s) and to the inner shell of the tank. The inner pipe for extending into a tank room can be connected to a valve in a valve block, and the outer wall of the pipe extending into the tank room can be welded to the valve block to provide a continuous secondary barrier for the inner pipe between the inner shell of the tank and the valve block.

Abstract: A method for operating an LNG fuelled marine vessel having a propulsion system, a power plant and an LNG storage tank, whereby LNG is supplied as a gas fuel from the LNG storage tank to the power plant. The marine vessel deploys a fixed LNG storage tank and a removable LNG storage tank on board the marine vessel. In order to facilitate bunkering, the removable LNG storage tank is removed and replaced by another removable LNG storage tank at a bunkering facility.

Abstract: A fuel feeding system for storing liquefied gas and feeding gaseous fuel to be used in a piston engine, which fuel feeding system includes at least two cryogenic fuel tank arrangements having a first tank arrangement and a second tank arrangement in connection with each other. The fuel feeding system includes a gaseous fuel feed line connected at its first end to at least one piston engine, in which system the first tank arrangement is provided with a pressure build-up system having a first heat exchanger unit. The inlet of the heat exchanger unit is connected to a bottom section of the first tank arrangement the outlet of which is connectable to the top section of the first tank arrangement. The first tank arrangement and the second tank arrangement are both pressure vessels, and the first tank arrangement is selectively connectable to the fuel feed line by a gas line extending from an outlet in the top section of the first tank arrangement.

Abstract: A method for operating an LNG fuelled marine vessel having a propulsion system, a power plant and an LNG storage tank, whereby LNG is supplied as a gas fuel from the LNG storage tank to the power plant. The marine vessel deploys a fixed LNG storage tank and a removable LNG storage tank on board the marine vessel. In order to facilitate bunkering, the removable LNG storage tank is removed and replaced by another removable LNG storage tank at a bunkering facility.

Abstract: The invention relates to a marine vessel comprising a hull and a propulsion arrangement. The marine vessel is further provided with at least one vertically arranged cylinder (6) with a cylindrical shell and with a first vertical axis (7). The vertically arranged cylinder is adapted to rotate around the first vertical axis. In order to provide a flexibly adaptable arrangement suiteable for various operating modes of the marine vessel, the cylindrical shell comprises at least three sections (62, 63, 64) with a curved portion extending between two ends, whereby each of the three sections is arranged to be turnable around a respective second vertical axis (8), which is positioned at the circumference of the cylindrical shell. Each section is arranged to be anchored into a given position.