Abstract: Washing of the gas turbine engine, during operation of the gas turbine engine, comprises a washing phase that consists in spraying a detergent liquid substance towards the inlet of the compressor of the engine; the mass flow of the detergent liquid substance to be sprayed is set so that the liquid-to-gas ratio at the inlet of the compressor is more than 1% and less than 5% with reference to the rated mass flow of the compressor; the washing phase comprises a first sub-phase during which the flow of the detergent liquid substance is increased gradually and a second sub-phase during which the flow of the detergent liquid substance is maintained constant.

Abstract: A multi-section centrifugal compressor includes at least a first and a second section; each section has an inlet duct and a discharge duct, the discharge duct of the first section is placed in fluid communication with the inlet duct of the second section, the second section is configured to compress a fluid compressed by the first section; the discharge duct of the second section is adjacent to the inlet duct of the first section.

Abstract: A device for controlling the flow in a turbomachine, in an embodiment, a centrifugal compressor; the device includes a plurality of fixed blades and a plurality of adjustable blades adjacent to the plurality of fixed blades so that each of the adjustable blades has an aerodynamic interaction with one of the fixed blades; each of the adjustable blades is pivoted to rotate about a fixed axis substantially located at the center of pressure of the adjustable blade; the center of pressure is evaluated when the blade is at a reference orientation.

Abstract: A centrifugal compressor impeller comprises a gas inlet, a gas outlet, and a disc having a plurality of blades extending therefrom. Each blade has a leading edge at the impeller inlet and a trailing edge at the impeller outlet, a blade base extending along the disc between the leading edge and the trailing edge, a blade tip extending between the leading edge and the trailing edge opposite the disc, a pressure side and a suction side. Each blade has a three-dimensional curvature in at least a portion of the surface, adjacent the leading edge. The leading edge has a curved, non-linear profile in a meridian plane. The blade portion has a double-curvature. Each blade has a first metal angle distribution at the blade base, a second metal angle distribution at the blade tip and at least a third metal angle distribution between the blade base and the blade tip.

Abstract: A method for preventing corrosion of an impeller-shaft assembly of a turbomachine comprises the steps of assembling an impeller on a shaft in order to define an impeller-shaft assembly; plating the assembly by inserting the assembly into a plating bath; and coating at least a first predefined surface on the impeller and a second predefined surface on the shaft wherein the coating step is performed by spraying the predefined surfaces.

Abstract: A compressed-air energy-storage system is described. The system includes a first compressor arrangement for compressing an air stream; a thermal energy storage unit, where through compressed air from the first compressor arrangement exchanges heat against a heat accumulation means; an air storage device arranged and configured for receiving and accumulating compressed air from the thermal energy storage unit; at least one expander for receiving compressed air from the air storage device and producing useful power therefrom. A further compressor arrangement is located between the thermal energy storage unit and the air storage device.

Abstract: The power system comprises a working fluid circuit having a high pressure side and a low pressure side and configured to flow a working fluid therethrough. The working fluid circuit further comprises a heater configured to circulate the working fluid in heat exchange relationship with a hot fluid to vaporize the working fluid. The system further comprises serially arranged first expander and second expander fluidly coupled to the working fluid circuit and disposed between the high pressure side and the low pressure side thereof. One of the expanders drives a load and the other expander drives a pump or compressor fluidly coupled to the working fluid circuit between the low pressure side and the high pressure side thereof. A cooler is further arranged and configured to remove heat from the working fluid in the low pressure side of the working fluid circuit.

Abstract: A coupling guard for a rotating member comprising a shell surrounding the rotating member, a plenum disposed in the shell, at least an injection tube for injecting a cooling gas and an outlet for discharging the cooling gas, wherein the injection tube extends through the plenum from a first axial opening proximal to the shell to a second axial opening proximal to the rotating member, the injection tube having a leading edge which first contacts the gas circulating in the plenum and a trailing edge opposite to the leading edge, the second opening having a first portion orthogonal to the axis of the injection tube and a second portion across the trailing edge, adjacent to the first portion and parallel to the axis of the injection tube.

Abstract: Fluid flow adapter for a cylinder of a reciprocating compressor, the cylinder having a side wall provided with a valve seat, the fluid flow adapter comprising a filler element having an internal surface facing an internal volume of the cylinder and an external surface facing the valve, the filler element having at least a channel connecting the internal surface to the external surface, wherein the internal surface is flush with the side wall of the cylinder, the channel being configured to allow the passage of fluid between the internal volume of the cylinder and the valve.

Abstract: A scroll for use in conjunction with a fluid compressor is described. The scroll comprises a fluid inlet adapted to receive a fluid flow and a fluid outlet adapted to discharge the fluid flow. The scroll further comprises a scroll-shaped wall defining an inner flow volume. At least one blade is provided in the inner flow volume of the scroll. The blade is configured and arranged for correcting a direction of the flow of fluid in the flow volume when the scroll is operating in off-design conditions.

Abstract: A casing for a rotating machine includes an inner surface delimiting an inner volume for housing a rotor of the rotating machine; a first and a second shell that are joined together in a dividable manner, the first and second shell respectively comprising a first and a second split flange having a first and a second split surface contacting each other when the shells are joined together; a plurality of holes on the first and second split flange passing through the first and second split surface for housing a plurality of bolts; a first groove connecting the plurality of holes; a second groove between the first groove and the inner surface of the casing; a first duct and a second duct for circulating a fluid to and from the first and second grooves, respectively.

Abstract: A method of starting a gas turbine is provided, comprising the step of providing an apparatus for regulating the flow of fuel in a gas turbine, the apparatus comprising a main line connecting a fuel source to a nozzle array; and an auxiliary line connecting the fuel source to the nozzle array. The method further comprises the steps of keeping the main line sealed while increasing the auxiliary line fuel flow rate; firing the gas turbine while keeping the main line sealed; and after the combustion has started in the gas turbine, opening the main line for increasing the main line fuel flow rate; wherein the auxiliary line maximum flow rate is less than the main line maximum flow rate.

Abstract: The compressor system comprises a compressor having first compressor stage and a second compressor stage in a back-to-back arrangement. A first gas flow is provided at the suction side of the compressor. A seal arrangement is provided between the first compressor stage and the second compressor stage. A side stream line is in fluid communication with the suction side of the second compressor stage. A side stream valve on the side stream line and a side stream controller are provided, for adjusting the flow of the second gas. An antisurge arrangement comprised of a bypass line and an antisurge valve is arranged at the first compressor stage for preventing surge of the first compressor stage. The side stream controller is configured for reducing the flow of the second gas when an alteration of the pressure ratio across the first compress stag is detected.

Abstract: A sealing device is described, for separating a first compartment from a second compartment in a turbomachine, a wet gas being processed in the first compartment. The sealing device comprises a rotary component and a stationary component. A sealing member is arranged between the rotary component and the stationary component. The device further comprises an annular wet-particles collector and an oil-jet element, mounted on the rotary component for rotation therewith. The oil-jet element is surrounded by the annular wet-particles collector, such that wet particles contacting the oil-jet element are projected by centrifugal force into the annular wet-particles collector.

Abstract: A turbo machine comprising a barrel casing having a cylindrical internal surface defining an internal containment volume, a bundle having a cylindrical shape, adapted to be accommodated into the internal containment volume, a cylindrical cover connected to the bundle to close the internal containment volume and hold the bundle inside the barrel casing, a split shear ring adapted to fix the barrel casing with the cylindrical cover wherein the external cylindrical surface of the cylindrical cover and the cylindrical internal surface of the barrel casing are provided with a first circumferential groove and a second circumferential groove adapted to accommodate the shear ring and wherein the first grooves is adapted to completely accommodate the cross section of the split shear ring.

Abstract: A magnetic bearing comprising a stator magnetic circuit secured to a stationary support device, the stator magnetic circuit comprising at least one coil and a ferromagnetic body placed in a protective annular support, the protective annular support leaving uncovered a surface of the ferromagnetic body and a surface of the at least one coil. The bearing also comprises at least one annular plug placed on the surface of the at least one coil which is left uncovered by the protective annular support, and the annular plug and the surface of the ferromagnetic body which is left uncovered by the protective annular support are coated by a protective layer.

Abstract: A seal assembly for a valve stem comprises an external seal placed on a valve stem facing an external environment; an internal seal placed on the valve stem facing a process environment; the external and internal seals define a chamber for the containment of barrier fluid; the chamber has an inlet configured to be placed into fluid communication with a source of barrier fluid; a detector of the amount of barrier fluid; a pressurizer device for providing the chamber with a positive pressure with respect to the process environment; the pressurizer device is configured to be installed coaxially with the valve stem.

Abstract: A crosshead for a piston rod is provided, which comprises a main body having a first and a second seat. The first seat is configured to hold a connecting rod, and the second seat is configured to hold a piston rod. The main body is made as a single piece.

Abstract: A wet-gas centrifugal compressor is disclosed. The compressor comprises a compressor casing and at least one impeller arranged in the compressor casing for rotation around a rotation axis. A stationary diffuser is arranged in the compressor casing and extends around the impeller. The diffuser has a curved end portion with a radially inner curved wall and a radially outer curved wall. A plurality of dry-gas extraction holes is provided, ending at a plurality of respective inlet ports arranged around the rotation axis and on the inner curved wall of the curved end portion of the diffuser. Each dry-gas extraction hole extends from the respective inlet port towards the rotation axis and is inclined over a radial direction, such that each dry-gas extraction hole is oriented in a counter-flow direction with respect to a direction of the gas flow in the curved end portion of the diffuser.

Abstract: A multistage turbomachine is disclosed, comprising a casing with a fluid inlet and a fluid outlet and a plurality of stages arranged in the casing. A flow path extends from the fluid inlet to the fluid outlet through the sequentially arranged stages. Each stage is comprised of a rotating impeller and an electric motor embedded in the casing and arranged for rotating the impeller at a controlled rotary speed. Each electric motor comprises a motor rotor, arranged on the impeller and integrally rotating therewith, and a motor stator stationarily arranged in the casing. Pairs of sequentially arranged impellers are configured for rotation in opposite directions.