Abstract: A sealing device includes: a sealing ring (1) slidably in hermetic contact with a surface of a shaft (A); a hollow partition wall (2) in contact with the sealing ring (1); and a housing (B) holding the sealing ring (1) and supporting the hollow partition wall (2). The sealing ring (1) is formed of an elastic material, and includes a lip part (1a) in sliding contact with the entire periphery of the surface of the shaft (A), an elastic arm part (1b) supporting the lip part (1a) at a sliding contact position, and a key part (1c) connecting the elastic arm part (1b) and the housing (B). The straining force on the shaft (A) is adjusted by expansion and contraction of the hollow partition wall (2).

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 lip seal includes: a lip part (1) forming a ring shape alone or with plural members and provided in sliding contact with the entire periphery of a surface of a shaft (0); an elastic arm part (2) and a flexible wall (3) supporting the lip part (1) at a sliding contact position; key parts (4) connecting the elastic arm part (2) and the flexible wall (3) to a housing (10), respectively, and a pressure regulation chamber (A) forming a ring shape alone or with plural members and using the elastic arm part (2) and the flexible wall (3) as partition walls. The flexible wall (3) is deformed by the increase and decrease in pressure in the pressure regulation chamber (A) to change the lip part (1) at least radially.

Abstract: The invention relates to a machinery arrangement, which comprises a combus-tion unit (3) arranged in an engine room (11), and an exhaust gas duct assem-bly (4) connected to the combustion unit (3) for receiving an exhaust gas flow and for leading the exhaust gas flow to the atmosphere through an exhaust gas cleaning system (5) provided with an exhaust gas pipe (52). In order to condi-tion the exhaust plume, the exhaust gas pipe (52) is arranged in an enclosure (114), whereby the enclosure (114) is arranged in flow connection with the en-gine room (11) in order to provide heat for the exhaust gas pipe (52) by means of a heated air flow from the engine room.

Abstract: A novel fuel injection unit for a large internal combustion engine includes a common rail fuel system. The fuel injection unit of the invention is constructed of at least a high pressure fuel accumulator specific for the fuel injection unit, a flow fuse, a first fuel injection valve with a control valve, and a second fuel injection valve with a control valve. The first fuel injection valve is a smaller one used for injecting at most 30% of the fuel required in full load operation of a diesel mode.

Abstract: The invention relates to a marine vessel (1) comprising a hull (2) and a propulsion arrangement including an internal combustion engine (3), an exhaust gas arrangement (4), and a propulsion unit (5). The marine vessel (1) further is provided with at least one vertically arranged cylinder (6) with a vertical axis, which vertically arranged cylinder (6) is adapted to rotate around its vertical axis. To avoid any substantial increase of windage area, the vertically arranged cylinder (6) is arranged around a part of the exhaust gas arrangement (4) of the marine vessel (1).

Abstract: An arrangement for providing liquefied natural gas (LNG) as fuel for propulsion of a ship (1, 6) having cargo tanks (2, 7) for liquefied gas comprises a source of LNG (3, 8) and at least one first heat exchanger (41) for vaporizing and/or heating the LNG directly or indirectly with a warmer medium (44). The warmer medium is boil-off gases from the cargo tanks (2, 7) being re-liquefied in the process.

Abstract: Disclosed is a method for maintenance of a ship propeller including the steps of: placing a flexible habitat having an open upper end over an uppermost blade and a portion of the propeller hub, and establishing a gas seal between the upper end of the habitat and the blade to close the habitat at its upper end. After fixing the lower end of the habitat relatively to the propeller, compressed gas is preferably introduced into the habitat to displace the water in the habitat. The apparatus for maintenance of a ship propeller under water comprises a flexible habitat with an open upper end. The habitat has a gas seal adapted to cooperate with a propeller blade surface to establish a gas seal to close the habitat at its upper end and fixing means adapted to fix the open lower end of the habitat relatively to the propeller. A means for introducing compressed gas into the habitat is provided.

Abstract: An arrangement is disclosed for connecting at least one double-walled pipe of stainless steel to a LNG tank having 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. The at least one double-walled pipe includes a common outer wall and at least one inner pipe. The outer wall of the pipe is connected to the inner shell of the tank in such a way that the outer wall and/or a pipe fitting of cold resistant material between the inner shell and the outer wall is arranged to compensate for changes in the length of the outer wall of the pipe and/or of the pipe fitting due to temperature differences between the outer wall of the pipe and the inner shell of the tank.

Abstract: The apparatus according to the invention comprises a controller for forming a speed signal arranged to receive speed measurement data of the internal combustion engine as well as speed reference data. The apparatus additionally comprises a module for forming the internal speed reference value instead of the speed reference value set to be used when forming the control signal.

Abstract: To remove contaminations in the area of a fire land (6) of a piston (5) an insert is provided (1) which sweeps the outer circumference of the piston (5) upon passing the top dead center and in so doing scrapes accumulating contaminations. The insert is formed of a first annular member (2) in which a second annular member (3) is inserted in a groove (9).

Abstract: The invention relates to a method of operating an internal combustion engine using liquid pilot fuel, which engine (2) has a plurality of cylinders (3) and engine controller (10) capable of adjusting a burning state of each cylinder through fuel regulation (100), including fuel cut-off, upon occurrence of abnormal combustion. Upon occurrence of abnormal combustion in a cylinder (3) the fuel injection is kept partially active with a pilot fuel injected (200) by pilot nozzle (31) of said cylinder (3).

Abstract: A cylinder liner (1) of a reciprocating engine, the cylinder liner (2) having an inner surface (3) acting as a running surface (4) for piston rings (5), which running surface (4) comprises an upper portion (U) and a lower portion (L). The upper portion (U)includes at least a top dead centre region of a topmost piston ring (5). Only the upper portion (U) of the running surface (4) is provided with a coating(7) of metal matrix composite reinforced with ceramic particles.

Abstract: A method for controlling a selective catalytic reduction system (SCR) exploiting a set of predetermined trigger events (101) and a set point for the NOx concentration (102). At the occurrence of a trigger event (104), NOx concentration measurement downstream from the catalyst elements (2) is started (105) and the difference between the measured concentration and the set point is determined (106). If the difference is negative, the dosing of the reducing agent is decreased (107) and a new trigger event is waited for (103). If the difference is positive, the dosing of the reducing agent is increased (108). After system stabilization (109), anew measurement is started (110) and the concentration is compared to the result of the previous measurement (111). If the measured value is below the previous measured value, the same dosing is maintained (112). If the measured value is above the previous measured value, the dosing is decreased with an amount greater than the increase after the previous measurement (113).

Abstract: A method to control the heat balance of fuel cell stacks in a fuel cell system, the fuel cell system including at least one fuel cell unit including fuel cell stacks, whose fuel cells include an anode side and a cathode side, as well as an electrolyte interposed therebetween, and a recuperator unit for heat exchange for preheating a supply flow of the cathode side. In the method, a desired portion is separated from the fuel exhaust flow coming from the anode side and adapted to be mixed with the cathode side exit flow before said recuperator unit. Also provided is a fuel cell system implementing the method.

Abstract: A method for maintenance of a unit which is arranged in a watertight hoisting chamber and closes an opening in a vessel hull is described. The unit is adapted to extend into the water below the vessel. The method includes clamping of the unit in its mounted position by a clamping means so that fixing means of the unit can be removed while the unit is held clamped in position. After the hoisting chamber is flooded to a desired level, the clamping of the unit can be completely released and no unintentional movement of the unit will occur. Guide means may be provided together with the apparatus and an automatic design of the clamping means can also be provided. Especially using such elements, mounting of the unit becomes easy, when the unit is lowered under water to its mounted position, is clamped there by the clamping means so as to tightly close the opening and after removing the water from the hoisting chamber, the fixing means can be applied in a dry environment.

Abstract: Exemplary embodiments are directed to a fuel cell system that is fed fuel and provided information on the fed fuel. The system generates information about fuel utilization in the fuel cells and oxygen to carbon ratio (O/C ratio) in the fuel cell system process and includes features for controlling a loading of the fuel cells. The fuel cell system also includes a first closed loop controller for controlling the feeding of fuel by taking into account the fuel utilization information as process feedback information, and by implementing a constraint function taking control of O/C ratio by restricting output of the first controller when said O/C ratio deviates from an allowed range, and a second controller for controlling active fuel cell loading by implementing a constraint function taking control of fuel utilization restricting output of the second controller when said fuel utilization deviates from an allowed range.

Abstract: A stern tube sealing assembly and a seal ring thereof has a key part having an inverted V-shape, a front step part on the front side, and a back step part on the back side thereof. The seal ring width in a propulsion-shaft axis direction becomes thinner in the transition area from the key part toward a heel part. The inner diameter of the key part at the back step part is greater than that of the key part at the front step part. The ring has a lip part having a V-shaped lip tip protruding inwardly in the radial direction and a spring groove having a semicircular cross-section. The center of the spring groove is nearer to the inboard side than the lip tip, by an offset in the axis direction, the offset being within approximately 10% of the orthogonal projection length of the width of the lip back.

Abstract: The aim of the invention is to reduce the frequency change of a electric network in fault situations so that there is no need for protection operations during relatively short imbalances between electricity production and demand thereof. The aim is achieved by means of an apparatus, system and method for electric power supply according to main claims for directing electric power to the electric motor (7). The apparatus according to the invention monitors the frequency of the network (1). In case the frequency of the network changes sufficiently, the apparatus reacts by changing the amount of electric power directed to the electric motor (7). The electric supply network (1) is provided with an opportunity to change the amount of produced electric energy in a controlled way so that the electric supply network is continuously in operation.

Abstract: The modelling arrangement of the configuration situation of the electric power transmission network according to the invention comprises a modelling element (7) designed to be installed in each generator of the electric power transmission network. The modelling element (7) is arranged to measure the state of the said switches until an open switch is detected and to detect the corresponding generator on the basis of the closed switch and thus to model the power transmission network comprising the detected generators and the area of the power transmission network belonging to the same electric network via closed switches.