Nuovopignone-industrie Meccaniche E Fonderia S.p.a.

Nuovo Pignone Spa

Nuovo Pignone Holding S.p.a.

Eniricerche S.p.a.

Nuovopignone

Vasco Mezzedimi

Franco Frosini

Giampietro F Aggradi

Gianni Ceccherini

Roberto Modi

Luciano Bonciani

Andrea Ronchieri

Lorenzo Barbieri

Vittorio Cocchi

Gianpietro Ferrari Aggradi

Corrado Palarchi

A device used as a chemical reactor or heat exchanger in general, with a thin tube plate, of the type in which at least one pipe is connected to a tube plate, this tube plate being closed by a chamber with a container function, wherein this chamber is produced by a section with any shape, with a base which is joined to the plate by a lateral portion; connection elements are also provided between the tube plate and the base of the chamber.

Thin tube plate and chamber support for a chemical reactor or heat exchanger

A screw-type pumping unit ( ) for treatment of fluids in several phases comprises a case ( ) which contains a pumping chamber ( ), inside which there are accommodated at least two screws ( ), one of which ( ) is a drive screw, and supports at one of its ends a first gear ( ), which engages with a second gear ( ), which in turn is supported at one end of a driven screw ( ). The first and the second gear ( ) are contained in a casing ( ) which is fitted onto them, and is provided with at least two through holes ( ) produced in two substantially opposite portions, through one of which oil can be admitted into the casing ( ), and wherein the oil can be discharged through the other through hole ( ), such that the casing ( ), together with the gears ( ), forms a gear pump which can keep the lubrication oil of the pumping unit ( ) circulating.

Screw-type pumping unit for treatment of fluids in several phases

Twin-screw pump, wherein the four conical screws are vertically arranged and are fed with biphase fluid at the two ends, independently of each other, by means of a stream divider and wherein the two screw shafts each have a central axial drilling which connects the delivery chamber to a series of radial channels which end up on the tip of the single teeth of the screws. A preferen-tial stream divider is described.

Perfected twin-screw pump, particularly suitable for the pumping of

A combustion system with low pollutant emission, of the pre-mixing type for gas turbines, in which the combustion air passes from the interspace to the pre-mixing chamber via apertures in this latter, their degree of opening being varied, in accordance with the fuel quantity used, by corresponding apertures in a rotatable drum, and in which a series of small holes fed with additional fuel is provided in the interspace. Further flame stabilization expedients and differential cooling of the combustion chamber are also provided.

Combustion system with low pollutant emission for gas turbines

A barrier system for the lubricating oil for the bearings of a centrifugal compressor with labyrinth seals installed in a confined environment, consisting of a disc concentrically rigid with the rotating compressor shaft in the chamber facing the bearing situated on the compressor suction side, in a position between said bearing and the relative suction side labyrinth seal, the disc having an inverted U-shaped rim housing a stator ring rigid with the wall of said chamber and arranged concentric with said shaft, which with said rotating disc forms a small passage continuously fed, and kept filled by the centrifugal effect of said rotating disc, with barrier oil bled from the lubricating oil feed, said stator ring being provided, on that side facing the disc, with a wedge which is inserted into a corresponding cavity in the disc, and with an annular deflector tooth projecting beyond the outer edge of said disc cavity.

Barrier system for the lubricating oil for the bearings of a centrifugal

A system for recovering the lubricating oil for the bearings of a centrifugal compressor with labyrinth seals, in which the discharge pipe of the chamber facing the bearing on the compressor delivery side is connected to the top or roof of an underlying sealed collection vessel, whereas the discharge pipe of the chamber facing the bearing on the compressor suction side extends within said sealed vessel to below the free surface of the oil. A modified embodiment is also provided.

System for recovering the lubricating oil for the bearings of a

A device for keeping the annular outlet mouth of the gas volute always centered about the nozzle assembly in a gas turbine, consisting of two diametrically divided retaining rings embracing said annular mouth, the lower half-ring having an inner radius greater than that of the upper half-ring, this latter forming predetermined radial gap with said annular mouth.

Device for keeping the annular outlet mouth of the gas volute always

A system for the rapid balancing of revolving shafts, in particular, the revolving shaft of a gas turbine. The system comprises two mutually adjacent bores provided in the stator of the turbine, which can be closed by relevant plugs, and which are collimated on the screw-threaded bores of the rotor. The system also comprises a special rigid rod for elastically holding a screw-threaded balancing mass, and for causing it to rotate.

System for the rapid balancing of revolving shafts, particularly

Hydraulic-exchange pumping device comprising two containers or tanks, inside each of which there are defined: a chamber for the product to be pumped, which is respectively connected, through a delivery valve and a suction valve, to the lines of delivery and of intake of the product to be pumped, as well as a chamber for the hydraulic drive fluid, which is connected to a pump through a four-way, three-position distribution box. This partitioning is accomplished by means of an internal elastic membrane having a decreasing thickness from the its peripheral edge towards its central zone, which can be also equipped with a strengthening cloth embedded inside it, as well as with a set of metal rings having a cross-section surface area decreasing towards the center of the same membrane.

Pumping device, particularly suitable for compressing fluids on deep

The invention relates to a mechanical device for the cut-off of fluid, particularly suitable for corrosive and polluting fluids, comprising an annular sealing member of packing displaceable towards and against the seal seating by means of a series of screw pins acting on the sealing member through a series of springs; each screw pin is only displaceable along its axis but not rotatable and has the thread thereof engaged with a threaded part of a corresponding pinion, all the pinions being rotatable by means of only one gear, whereby the rotation of said gear causes the screw pins and thus the sealing member to be displaced towards and against the sealing seat, the displacement in the opposite direction being only possible upon said gear is rotated in the opposite direction.

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Poggibonsi, Italy

Vasco Mezzedimi