Abstract: Systems, devices and methods according to these exemplary embodiments provide couplings or interfaces usable, for example, in the high speed balance testing of rotors are provided. A coupling includes a main body portion having an extended thin portion therein which is configured to fit a shaft of the balancing machine and an extended insert portion which is configured to fit an opening in the rotor. A plurality of connection elements is disposed in holes in the main body portion of the coupling and a ring is disposed over the extended insert and proximate exits of the holes in the main body portion.

Abstract: A centrifugal compressor includes a rotor assembly with a shaft and a plurality of impellers, bearings located at ends of the shaft and configured to support the rotor assembly, a sealing mechanism disposed between the rotor assembly and the bearings, and a gas bearing disposed between the plurality of impellers for supporting the shaft and receiving a working gas from an impeller downstream from a location of the gas bearing.

Abstract: Methods and devices for performing a low torque low speed test to determine whether a rotor of a turbomachinery is free to rotate are provided. A method includes automatically applying a torque to the rotor, the torque gradually increasing up to a predetermined torque value. The method further includes monitoring the speed of the rotor while the torque is gradually increased. The method also includes outputting an indication that the rotor is free to rotate after the speed of the rotor becomes positive, or outputting an indication that the rotor is locked when the speed of the rotor remains zero and the applied torque has reached the predetermined torque value.

Abstract: Herein described is a system for injecting and extracting gas for a fluid rotating machine of the type comprising at least one stator case, one first stage which receives the gas flowing into the machine, one final stage, downstream of which the gas is discharged from the machine, and one or more intermediate stages arranged between the first stage and the final stage. Each stage is made up of a single centrifugal rotor and a fixed ducting, associated to such centrifugal rotor and made on the single stator case. The system comprises at least one first worm screw for extracting gas from the machine and at least one second worm screw for injecting gas into the machine. Both worm screws for extracting gas and for injecting gas are operatively connected to at least one stage of the machine.

Abstract: Gas turbine, software and method for controlling an operating point of the gas turbine that includes a compressor, a combustor and at least a turbine is provided. The method includes determining a turbine exhaust pressure at an exhaust of the turbine; measuring a compressor pressure discharge at the compressor; determining a turbine pressure ratio based on the turbine exhaust pressure and the compressor pressure discharge; calculating an exhaust temperature at the exhaust of the turbine as a function of the turbine pressure ratio; identifying a reference exhaust temperature curve in a plane defined by the exhaust temperature and the turbine pressure ratio; and controlling the gas turbine to maintain the operating point on the reference exhaust temperature curve.

Abstract: A vessel of a heat storage and release apparatus, the vessel comprises a shell comprising a metallic material, the shell having an elongated shape with a first end region and a second end region remote from the first end region, and an internal surface defining a cavity configured to contain a heat storage and release device and to guide gas-flow; a first opening through the shell for a flow of gas at high temperature and high pressure, the first opening being located in the first end region; a second opening through the shell for a flow of gas at low temperature and high pressure, the second opening being located in the second end region; and a lining of thermally insulating material adjacent to the internal surface and only partially covering the internal surface, the lining being located at least in the first end region.

Abstract: Methods and devices for performing a model based anti-surge dead time compensation in systems including a compressor and an anti-surge loop are provided. A new position of an anti-surge valve on the anti-surge loop is determined by correcting for dead time a value of the anti-surge parameter calculated from field measurements, based on a predicted anti-surge parameter estimated using a deterministic model which has as variables the field measurements and a current position of the anti-surge valve.

Abstract: A rotary machine includes a machine rotor, a machine stator, a labyrinth seal disposed between the machine rotor and the machine stator, a dry gas seal disposed between the machine rotor and the machine stator, the dry gas seal being disposed downstream of the labyrinth seal, the labyrinth seal including a labyrinth seal rotor, and, a labyrinth seal stator, the labyrinth seal stator having a cavity containing a heat transfer medium configured to transfer heat between the labyrinth seal stator and a zone adjacent the labyrinth seal stator to cool or heat a pressurized process fluid before the process fluid bears against the dry gas seal.

Abstract: Methods, systems and controllers for detecting a surge event based on pattern of evolution of a discharge pressure of a compressor, and for relocating a surge margin relative to a surge parameter value recorded at the beginning of the surge event are provided. A controller has an interface configured to receive values of the discharge pressure from a compressor, and to output signals and alarms, a surge event detection unit connected to the interface and configured to detect a surge event in the compressor based on evolutions of the discharge pressure, a rate of the discharge pressure and a rate change of the rate, and a surge margin relocation unit connected to the surge event detection unit and the interface, and configured to relocate a surge margin relative to a surge parameter value recorded at a beginning of the surge event.

Abstract: Disclosed herein is a differential pressure poppet valve comprising: a valve body, the valve body having at least one flow inlet and at least one flow outlet; at least one shutter guide disposed inside the valve body; at least one poppet shutter guided by the shutter guide; at least one flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the poppet shutter. The valve further comprises at least one biasing member configured to bias the poppet shutter towards a closed position so as to block the flow passage through the flow inlet. To reduce impact wear at least a first damper is provided, configured and arranged to at least partly absorb impact energy of the poppet shutter when the poppet shutter opens or closes the flow inlet.

Abstract: A centrifugal compressor is disclosed. The centrifugal compressor comprises a first duct configured to receive a process gas, an impeller connected to the first duct and configured to compress the process gas, wherein the impeller has an outer surface, a first seal comprising, a first plurality of swirl brakes configured to have a tooth shape to reduce the inlet seal swirl of a flow of the process gas at an entrance to the first seal, wherein each swirl brake is disposed at a leading edge of the first seal and is configured to have a gap between the first plurality of swirl brakes and the outer surface of the impeller seal. A seal including a plurality of swirl brakes for reducing an inlet swirl and a method of manufacturing such a seal are disclosed.

Abstract: A torsional mode damping controller system is connected to a converter that drives an electrical machine mechanically connected to a train. The controller system includes an input interface configured to receive measured data related to variables of the converter or the electrical machine, and a controller connected to the input interface. The controller calculates at least one dynamic torque component along a section of a shaft of the train based on the data from the input interface, generates control data for the converter for damping a torsional oscillation in the mechanical drive train based on the at least one dynamic torque component, and sends the control data to the converter for modulating an active power exchanged between the converter and the electrical machine.

Abstract: A system for testing a compressor is provided. The system comprises one or more compressors connected together in series to a test compressor wherein an output of the test compressor is connected to an input of a first compressor in the series, forming an overall loop, one or more process fluid coolers in the overall loop, one or more orifices in the overall loop, a control valve in the overall loop, and a first plurality of sensors configured adjacent to a process fluid input of the test compressor and a second plurality of sensors configured adjacent to a process fluid output of the test compressor.

Abstract: Method for laterally replacing a heavy component of a plant assembly, the method including disconnecting the heavy component from other components of the plant assembly and from a base plate to which the heavy component is fixed; lifting the heavy component above the base plate with a lifting system provided within the base plate; connecting at least a pair of rails to the base plate, under the lifted heavy component, such that the at least a pair of rails extends at substantially a right angle relative to a longitudinal axis of the heavy component; lowering the heavy component on crawling mechanisms disposed on the at least a pair of rails; and laterally replacing the heavy component from the base plate and the other components of the plant assembly by actuating the crawling mechanisms.

Abstract: A Method and machine tool for compensating a wear of an electrode that machines a workpiece. The method includes selecting a current pocket from plural pockets of the workpiece; updating a wear compensation to be applied to the electrode for the current pocket based on wear compensation of a previous pocket, where the previous pocket is adjacent to the current pocket; and applying the updated wear compensation to the electrode for machining the current pocket.

Abstract: An impeller for a turbo-machine and is provided. The impeller includes a metallic base having a central hole, a back surface and a front surface opposite to the back surface; at least one blade extending on the front surface of the metallic base; a composite shroud attached to the at least one blade such that plural closed paths or vanes are formed by the front surface of the metallic base, the at least one blade and the composite shroud; and a connector configured to attach the composite shroud to the metallic base or the at least one blade.

Abstract: Gas heater/cooler apparatuses and methods of manufacturing thereof are provided. A gas heater/cooler apparatus has a gas pipe configured to transport a fluid inside a heat transfer block. A fluid flow through a cooling pipe in the proximity of the gas pipe or pushed towards the gas pipe by a fan cools the fluid. An electric heater disposed inside the heat transfer block close to the gas pipe may heat the fluid flowing therein via radiated heat.

Abstract: Systems and methods include using a subsea machine for separating a mixture received from a seabed well. The subsea machine includes: a chamber configured to receive and separate by gravity the mixture received from the seabed well. The chamber includes: a housing configured to contain the mixture received from the undersea well during separation, and a piston provided inside the housing and separating the housing into a top section and a bottom section. The piston is configured to move in a first direction along an axis to create more space in the top section for receiving the mixture from the seabed well and to move in a second opposite direction along the axis for removing the mixture from the chamber after separation has occurred.

Abstract: A turbomachine is provided. The turbomachine comprises a compressor, at least two magnetic bearings provided at opposite ends of a compressor shaft, a motor having a motor shaft, a first electrical cable having a first end, a second end, an internal core section and an outer sheath section with the internal core section and the outer sheath section extending from the first end to the second end, a first connector configured to connect the first end to the first magnetic bearing, wherein the first connector is welded or brazed to the first end to both the internal core section and the outer sheath section, and a second connector configured to connect the second end to the first external connection, wherein the second connector is welded or brazed to the second end to both the internal core section and the outer sheath section.

Abstract: Method and rotor for a compressor. The rotor includes a solid first stub having a first end configured to engage with a corresponding bearing and a second end having a flange configured to be attached by bolts to a corresponding flange of a first impeller of the compressor; a tie rod configured to pass through the first impeller of the compressor; a nut being configured to engage a threaded region of the first end of the tie rod; and a solid second stub having a first end configured to receive the threaded portion of the second end of the tie rod and a second end configured to engage with a corresponding bearing. The tie rod does not contact the solid first stub.