Abstract: A turboexpander pump unit has a vertical or horizontal shaft, a pump connected to an end of the shaft for pressurizing a liquid fluid to a pressure higher than a predetermined delivery pressure, a heat exchanger for heating and converting the liquid fluid pressurized by the pump into a high-pressure gas, and an expander turbine connected to an opposite end of the shaft and actuatable by a thermal energy reduction produced when the high-pressure gas from the heat exchanger is lowered to the predetermined delivery pressure, for delivering the liquid fluid continuously under a predetermined pressure to an external installation. The pump having at least two outlet ports for discharging the liquid fluid at respective different pressures. One of the two outlet ports is connected to the heat exchanger, and the other to a liquid delivery line.

Abstract: A pump casing made of sheet metal has an outer casing having a suction nozzle, and an inner casing housed in said outer casing and spaced therefrom. A resilient seal is disposed in a gap defined between the outer casing and an inner casing. An impeller is rotatably disposed in the inner casing with a clearance defined between a liner portion of the inner casing and the impeller. The resilient seal is effective to absorb deformations of the outer casing, such deformations of the outer casing are not transmitted to the inner casing.

Abstract: A pump casing made of sheet metal has an outer casing having a suction nozzle, and an inner casing housed in said outer casing and spaced therefrom. A resilient seal is disposed in a gap defined between the outer casing and an inner casing. An impeller is rotatably disposed in the inner casing with a clearance defined between a liner portion of the inner casing and the impeller. The resilient seal is effective to absorb deformations of the outer casing, such deformations of the outer casing are not transmitted to the inner casing.

Abstract: A cemtrifugal pump in which the thrust generated by an impeller is balanced by the operation of a balancing disc device. In the pump, a magnetic bearing is employed as an axial thrust bearing. The distance between the surface of a balancing disc and an axial displacement detecting surface which, together with the pump shaft, and the distance between such surface of a balancing disc seat is a fixed-side member which faces the balancing disc surface. The surface of a displacement sensor is another fixed-side member which faces the axial displacement detecting surface and are made equal to each other, or the latter distance is made slightly larger than the former distance. The neutral position of the magnetic thrust bearing is made to substantially coincide with the axial position of the rotator of the pump and is determined by the balancing disc device during running of the pump.