A bleed air valve comprises a piston that moves along a guide, where the piston includes a first surface and an opposing second surface. A pressure divider network includes a divider network inlet having an inlet cross sectional area in fluid communication with a fluid passage, a divider network outlet having an outlet cross sectional area in fluid communication with ambient pressure, and a network chamber in fluid communication with the divider network inlet and the divider network outlet. The network chamber has a pressure value between pressure at the divider network inlet and pressure at the divider network outlet. A shuttle valve includes a shuttle inlet and a shuttle outlet, where the shuttle outlet is in fluid communication with the first surface. An electromechanical valve receives a command signal and in response provides compressed air to an electromechanical valve output that is in fluid communication with the shuttle inlet.

A method of operating a gas turbine engine having a high pressure compressor and a secondary air system includes, when the gas turbine engine is operating in a first power range, providing a first bleed source for the secondary air system by bleeding air from a first bleed location, providing bleed air at a first pressure, proximate to an outlet of the high pressure compressor. When the gas turbine engine is operating in a second power range, higher than the first power range, the method includes providing a second bleed source by bleeding air from both a second bleed location and a third bleed location. The second and third bleed locations, respectively providing bleed air at second and third pressures, are both disposed upstream of the first bleed location within the gas turbine engine. The second and third pressures are different from the first pressure.

The proposed mechanical method of turbocompressor surge detection uses vibration signals from vibration monitoring equipment mounted on the compressor components to detect a surge event and provide antisurge control thereby. This method utilizes only mechanical information to identify surge, as compared to present day antisurge controllers that use compressor thermodynamic information such as flow, pressure, and temperature to locate a compressor's operating point on a compressor map compared to a surge region.

A method for controlling a pump in connection with first activation of the individual pump following a connection of the individual pump to a power supply. The pump is configured to be connected to a Pump Network including a plurality of pumps. When connecting the individual pump to the power supply, the method includes causing the individual pump to remain deactivated, determining a value of at least one Operational parameter (OP) of the individual pump, determining a Reference input value (RIV) based on the determined value of the at least one Operational parameter (OP), utilizing the determined Reference input value (RIV) in a Random pause time function (RF) and obtaining a random Activation pause time (APT) as an output from the Random pause time function (RF), and permitting activation of the individual pump after the Activation pause time (APT) has elapsed.

A control device configured to control an inflow adjusting unit that quantitatively adjusts an inflow of a gas into a compressor and to control a valve provided in a second flow passage branching from a first flow passage from the compressor to a compressed gas supply destination includes: a command calculating unit that is configured to calculate a command value for at least any one of the inflow adjusting unit and the valve; and a correction value calculating unit that is configured to calculate a correction value with respect to a command value for at least any one of the inflow adjusting unit and the valve.

A bleed valve includes a housing with an inlet coupled to an outlet by a duct, a guide tube with an orifice fixed in the housing between the inlet and the outlet, a piston, and baffle. The piston is slideably supported on the guide tube and is movable between an open and a closed position, the duct fluidly coupling the inlet and outlet in the open position, the duct fluidly separating the inlet and outlet in the closed position. The orifice fluidly couples the inlet and outlet in the open and closed positions to move piston between the open and closed positions according to differential pressure between the bleed valve inlet and outlet. The baffle is slideably supported by the guide tube to set the differential pressure at which the piston moves between the open and closed positions. Gas turbines and differential pressure adjustment methods are also described.

A mixture of hydrocarbons in vapour phase is passed through a feed scrubber. Feed scrubber vapour discharged from the feed scrubber is passed to a compression suction scrubber, and a vaporous compressor feed stream from the compression suction scrubber is compressed in a compressor train. A compressed vaporous discharge stream from the train of compressors is de-superheated, and at least a portion of the de-superheated stream is passed to a condenser, wherein this portion of the de-superheated stream is at least partly condensed to form a pressurized and at least partially condensed mixture of hydrocarbons. A recycle portion is split off from the de-superheated hydrocarbon stream, and a recycle flow is established to the compressor train of via a surge recycle separator drum and the compression suction scrubber. Liquid constituents removed and drained from the recycle portion in the surge recycle separator drum are fed to the feed scrubber.

A method for operating a pump includes establishing a pump limit characteristics diagram by mapping a first system parameter (P1) as a function of a second system parameter (P2) to identify a permissible operating region of the pump; for each first system parameter value (P1.sub.0), identifying a minimum allowable second system parameter value (P2.sub.0); monitoring the first system parameter (P1) and identifying a minimum allowable second system parameter value (P2.sub.0) corresponding to the monitored first system parameter value (P1.sub.m); monitoring the second system parameter (P2) and comparing the monitored second system parameter value (P2.sub.m) with the identified minimum allowable second system parameter value (P2.sub.0); and regulating a control valve that controls fluid flow through a return line connecting the suction and discharge sides of the pump so that the monitored second system parameter value (P2.sub.m) does not fall below the minimum allowable second system parameter value (P2.sub.0).

A compressor system includes: a compressor having an upstream region into which a working fluid flows, a downstream region in which the pressure of the working fluid is greater than that in the upstream region, inlet guide vanes that are provided further upstream than the upstream region and capable of altering the flow rate of the inflowing working fluid, and an extraction part that is provided to a portion between the upstream region and the downstream region and capable of extracting at least a portion of the working fluid; detection devices, at least one of which is provided in each of the upstream region and the downstream region, for detecting the physical quantity of the working fluid; and a control device for adjusting, on the basis of changes in the physical quantity, the opening degree of the inlet guide vanes and the amount extracted by the extraction part.

A suction throttling valve adjusts flow of a process gas through an inlet flowline. A compressor pressurizes the process gas. An outlet flowline flows the process gas from the compressor. An anti-surge flowline branching from the outlet flowline directs a first portion of the process gas from the outlet flowline back to the inlet flowline. The anti-surge flowline is connected to the inlet flowline intermediate of the suction throttling valve and the compressor. An anti-surge control valve adjusts flow of the first portion of the process gas through the anti-surge flowline to the inlet flowline. A bypass flowline provides an alternative flow path for a second portion of the process gas flowing through the anti-surge flowline to the inlet flowline around the suction throttling valve. A bypass control valve adjusts flow of the second portion of the process gas through the bypass flowline.