Abstract: The present invention relates to a method and a system for supplying liquefied gas source tank (110) to a liquefied gas consumer tank (200) and/or liquefied gas consumer, wherein the liquefied gas is supplied via a transfer line (130, 140, 210) to the liquefied gas consumer tank (200) and/or the liquefied gas consumer, and wherein after having supplied liquefied gas to the liquefied gas consumer tank (200) and/or liquefied gas consumer, residual liquefied gas remaining in at least a part of the transfer line (130, 140, 210) is drained into a liquefied gas holding tank (120) and a pressurized gas is then fed into the liquefied gas holding tank (120) in order to return at least a part of the residual liquefied gas in the holding tank via a return line (160) back into the liquefied gas source tank (110).

Abstract: The invention relates to a method for providing pressurized gas from a source of liquefied gas to a consumer (8), wherein vaporized gas is supplied from the source of liquefied gas (1) through a main input line (2) to a compressor arrangement (300) for pressurizing the vaporized gas, the compressor arrangement (300) comprising a plurality of compressor modules (3, 5, 31, 51), each compressor module being able to operate independently from any other compressor module of the compressor arrangement (300), one or more of the compressor modules (5, 51) of the compressor arrangement (300) can be bypassed, and wherein gas is conducted through only a part or all of the compressor modules depending on at least one of pressure level, temperature level, mass flow and composition of the gas to be provided to the consumer (8).

Abstract: A method for transferring cryogenic fluid from a storage tank (2; 12; 16) to a receiver (6; 8; 10; 14; 16; 18) like a receiving tank or to an application device, according to the invention comprises the steps of: a—pumping cryogenic liquid from the storage tank (2; 12; 16), b—vaporising at least partially the pumped cryogenic liquid, c—pressurising the storage tank (2; 12; 16) with the vaporised cryogenic liquid, and d—transferring cryogenic fluid to the receiver (6; 8; 10; 14; 16; 18) with cryogenic fluid from the storage tank (2; 12; 16) through a feed line (4) between the storage tank (2; 12; 16) and the receiver (6; 8; 10; 14; 16; 18).

Abstract: Method for controlling a plural stage compressor comprising at least a first stage (10), a second stage (20) and a first inter-stage line (12) between the first stage (10) and the second stage (20), comprising the steps of: a—measuring the temperature at the inlet of the compressor, b—measuring the ratio between the outlet pressure (Pout) and the inlet pressure (Pin) of the first stage (10) of the compressor, c—calculating a coefficient (?) based at least on the value of the inlet temperature (Tin) and on the measured pressure ratio (Pout/Pin), d—if the calculated coefficient (?) is in a predetermined range, acting on a control valve (70; 76; 92) mounted in a line (4; 8) supplying the inlet of the first stage (10) of the compressor or in a gas recycle line (74) which opens into the first inter-stage line (12).

Abstract: Method for controlling a compressor comprising a last stage (40) and a compressor load controller (90), a set point outlet pressure corresponding to the consumer needed pressure, being given in the load controller (90) comprising the steps of: a—measuring the temperature at the inlet of the last stage (40), b—measuring the ratio between the outlet and inlet pressure of the last stage (40), c—computing a coefficient (?) based on the value of the inlet temperature (Tin) and on the pressure ratio (Pout/Pin), d—if the coefficient (?) is in a predetermined range, changing the set point outlet pressure by a new greater set point outlet pressure until the coefficient (?) computed with the new set point outlet pressure goes out of the predetermined range, and e—adapting the pressure of the fluid coming out of the compressor in a pressure regulator (100) to the consumer needed pressure.

Abstract: Method for controlling a plural stage compressor comprising at least a first stage (10), a second stage (20) and a first inter-stage line (12) between the first stage (10) and the second stage (20), comprising the steps of: a—measuring the temperature at the inlet of the compressor, b—measuring the ratio between the outlet pressure (Pout) and the inlet pressure (Pin) of the first stage (10) of the compressor, c—calculating a coefficient (?) based at least on the value of the inlet temperature (Tin) and on the measured pressure ratio (Pout/Pin), d—if the calculated coefficient (?)is in a predetermined range, acting on a control valve (70; 76; 92) mounted in a line (4; 8) supplying the inlet of the first stage (10) of the compressor or in a gas recycle line (74) which opens into the first inter-stage line (12).

Abstract: A set (10) for dispensing liquefied gas from a vessel (100) comprises a supporting structure (1), a pump (2) and a conditioning system (4). The supporting structure is designed for maintaining both the pump and the conditioning system inside the vessel when the set is in operation condition for dispensing a flow of liquefied gas. The set allows easy handling, simple fitting to the vessel and easy removal from the vessel because a main part of said set can be handled as a one-block element.

Abstract: The system for treating a gas deriving from the evaporation of a cryogenic liquid and supplying pressurized gas to a gas engine according to the invention comprises, on the one hand, from upstream to downstream, a reliquefaction unit (10) with compression means (11, 12, 13), a first heat exchanger (17) and expansion means (30), and, on the other hand, a pressurized gas supply line comprising, from upstream to downstream, a pump (48) for pressurizing the liquid and high-pressure vaporization means (61). The pressurized gas supply line has, upstream of the vaporization means (61), a bypass (57) for supplying a second heat exchanger (60) between, on the one hand, pressurized liquid of the supply line (56) and, on the other hand, a line (22) of the reliquefaction unit (10) downstream of the first exchanger and upstream of the expansion means (30).

Abstract: The invention provides an apparatus comprising a storage tank, a liquid piston compressor and a gas-fed device. The storage tank is configured to store liquefied gas therein. The liquid piston compressor is disposed downstream of, and in fluid communication with, the storage tank and is configured to receive boil-off gas from the storage tank and to compress the gas. The gas-fed device is disposed downstream of, and in fluid communication with, the liquid piston compressor, and is configured to receive compressed gas from the liquid piston compressor.

Abstract: Apparatus for supplying natural gas fuel to an ocean-going tanker for the transport of liquefied natural gas (LNG), includes a first line with a compressor (12) having an inlet communicating with an ullage space (4) of at least one LNG storage tank (2) and an outlet communicating with a conduit leading from the compressor to at least one engine (38), and a second line with a forcing vaporiser (24) having an inlet communicating with a liquid storage region (6) of the tank (2), the second line being connected to the first line downstream of the compressor (12) and upstream of the at least one engine (38).

Abstract: A system (100) for liquefying a gas comprises a liquid piston gas multistage compressor (2). It can be arranged on-board a liquefied gas carrier for recycling boil-off gas. Such system may be easily adapted or controlled for matching wide requirement ranges for variations of the liquefaction capacity. In addition, at least part of the liquid piston gas multistage compressor can be shared between the gas liquefying system and an extra gas-fed device. Such extra gas-fed device may be in particular a gas-fuelled or hybrid fuel propulsion engine of the vessel.

Abstract: This method for dispensing cryogenic liquid includes the following steps: connecting, in a sealtight manner, a fuel tank (2) to be filled to a storage tank, dispensing cryogenic liquid to the fuel tank (2) and determining firstly the flow of liquid being dispensed and the amount of liquid dispensed, and secondly the pressure prevailing in the fuel tank (2), stopping the dispensing of the liquid when the pressure exceeds a first predetermined threshold or else when the flow of liquid drops below a second predetermined threshold, degassing the fuel tank (2) after stopping the dispensing, while determining the amount of gas removed from the fuel tank (2) during the degassing, and determining whether or not liquid should be dispensed again on the basis of the amount of gas removed during the degassing.

Abstract: A method for replenishing the supply of cryogenic liquid from a storage tank (2) includes: pressurizing a container (14) with cryogenic gas at a first pressure, said container having passing through it a first cryogenic fluid flow line referred to as the cold line and a second cryogenic fluid flow line referred to as the hot line, passing cryogenic liquid at a second pressure through the cold line (12), and supplying the container (14) with cryogenic gas at least partially from cryogenic liquid pumped from the storage tank (2) and vaporized. A device is also provided for the method hereinabove.

Abstract: The present invention relates to a turbine engine comprising a wheel, (2) mounted on a shaft (4), and a disk (18), adjacent to the wheel (2) and mounted on the same shaft while being rotated by the latter. The disk (18) is made of a material having a density greater than that of the material used to manufacture the wheel (2). The invention is of use in a compressor/turbine.

Abstract: A system for supplying compressed gas to several gas-fed devices is based on a liquid piston gas multistage compressor (100). Gas pressure measurements performed at a gas intake (10), an intermediate gas outlet (20) and at an end gas outlet (30) of the system allow controlling respective gas capacities of the compressor stages. Easy and reliable control can thus be obtained for the system operation. Varying the number of the compressor stages allows matching any pressure requirements for the gas delivery to all the gas-fed devices, and varying the gas capacities of the compressor stages allows easy adaptation to variable gas consumptions of the gas-fed devices.

Abstract: This cryogenic pump comprises: a pump body (2) inside which is a piston (26) mounted so as to be mobile in translation along an axis (24) referred to as the longitudinal axis and bounding a pumping chamber (31), means for supplying liquid to the pumping chamber (31) and means for discharging pressurized liquid from the pumping chamber (31), comprising a discharge valve (40) mounted in a discharge valve body (18) mounted on the longitudinal axis (24), the supply means comprising a supply valve (42) arranged at the periphery of the discharge valve body (18).

Abstract: The system for treating a gas deriving from the evaporation of a cryogenic liquid and supplying pressurized gas to a gas engine according to the invention comprises, on the one hand, from upstream to downstream, a reliquefaction unit (10) with compression means (11, 12, 13), a first heat exchanger (17) and expansion means (30), and, on the other hand, a pressurized gas supply line comprising, from upstream to downstream, a pump (48) for pressurizing the liquid and high-pressure vaporization means (61). The pressurized gas supply line has, upstream of the vaporization means (61), a bypass (57) for supplying a second heat exchanger (60) between, on the one hand, pressurized liquid of the supply line (56) and, on the other hand, a line (22) of the reliquefaction unit (10) downstream of the first exchanger and upstream of the expansion means (30).

Abstract: A set (10) for dispensing liquefied gas from a vessel (100) comprises a supporting structure (1), a pump (2) and a conditioning system (4). The supporting structure is designed for maintaining both the pump and the conditioning system inside the vessel when the set is in operation condition for dispensing a flow of liquefied gas. The set allows easy handling, simple fitting to the vessel and easy removal from the vessel because a main part of said set can be handled as a one-block element.

Abstract: A system (100) for liquefying a gas comprises a liquid piston gas multistage compressor (2). It can be arranged on-board a liquefied gas carrier for recycling boil-off gas. Such system may be easily adapted or controlled for matching wide requirement ranges for variations of the liquefaction capacity. In addition, at least part of the liquid piston gas multistage compressor can be shared between the gas liquefying system and an extra gas-fed device. Such extra gas-fed device may be in particular a gas-fuelled or hybrid fuel propulsion engine of the vessel.

Abstract: The invention provides an apparatus comprising a storage tank, a liquid piston compressor and a gas-fed device. The storage tank is configured to store liquefied gas therein. The liquid piston compressor is disposed downstream of, and in fluid communication with, the storage tank and is configured to receive boil-off gas from the storage tank and to compress the gas. The gas-fed device is disposed downstream of, and in fluid communication with, the liquid piston compressor, and is configured to receive compressed gas from the liquid piston compressor.