Abstract: A device whereby water leaking through the guide vanes while the water-wheel is in spinning reserve can be drained through leak drain pipes which open in the fixed member near the outer periphery of the runner.

Abstract: A rotary machine, such as a gas turbine engine, capable of reliable operation with improved overall cycle efficiency is disclosed. Various construction details which aerodynamically isolate internal cavities of the machine from the flow path for the working medium gases are developed. A sealing system built around the use of free vortex phenomenon reduces the amount of air which must be flowed through the cavity to prevent ingestion of the working medium gases into the cavity.

Abstract: A centrifugal fluid pump includes a casing housing an impeller having a suction eye, an axial fluid inlet to the impeller eye, a fluid discharge, and a recirculation line for recycling leakage liquid from the casing to the fluid inlet to minimise the risk of cavitation occurring at the impeller eye. A heat exchanger is located in the recirculation line for cooling the recycled leakage liquid and has control means associated therewith. The recycled liquid is introduced by a duct into the fluid inlet close to the impeller eye with an axial component of flow so that disturbance to flow in the inlet is reduced. In particular, the recirculation line may discharge into an annular velocity stabilising chamber at the fluid inlet, and a frusto-conical passage delivers the liquid from the chamber to the fluid inlet.

Abstract: A rotary centrifugal pump having an axial inlet and discharge in a casing together with an impeller having liquid impelling vanes on both surfaces thereof with the impeller having central openings enabling inlet liquid to be impelled by vanes on both surfaces of the impeller with the impeller being provided with spaced annular seal rings mounted on each side thereof. The pump includes a water cooled lubricant for a bearing and a seal box in which lubricant is maintained under pressure by the liquid being pumped. The pump is adapted for use as a single stage, multiple stage, or deep hole pump and is capable of producing relatively high pressures and high volume discharge.

Abstract: A rotary radial flow machine such as a centrifugal compressor for compressing gas, and having an annular shroud encompassing the rotor blades thereof and forming with the surrounding portion of the machine an enclosed restricted access gas containment zone is provided with a gas supply to provide a low-drag gas to the enclosed zone to substantially exclude working gas passing through the compressor from entering the enclosed zone, so as to reduce the drag on the rotor. A shroud seal between the shroud and the surrounding portion of the machine limits the passage of the gas relative to the zone.

Abstract: This invention relates to a device for rendering pumps tight of the type in which the pressure of the auxiliary liquid is a function of the pressure prevailing in the pump body, wherein the stuffing box communicates with a reservoir constituted by a casing open on one face but normally closed by an elastically deformable membrane covered by a casing communicating with the pump body.