electrical generator or a hydraulic pump within the casing rotating shaft sealing problems are eliminated application_number US 51517374 A description in the embodiment shown in fig1 the main components are encapsulated in a pressure resistant casing comprising a cylindrical main part 10 and two domed gables caps on ends 11 and 12 a gas turbine comprising two rotors 13 and 14 and a compressor 15 is mounted within said casing the rotor 13 drives a hydraulic pump 16 and the rotor 14 drives said compressor but it is to be understood that both turbine rotors can be connected to the pump or can be connected to two parallel connected pump units respectively as has been suggested by a dashed line 17 so that when it is required power can be transferred from the turbine means in order to quickly accelerate the compressor or for driving the output load via the pump of the hydraulic system or an electrical generator and the motor means pertaining thereto a gaseous medium for instance air helium or hydrogen is circulated in a closed path through the turbine and compressor and is fed through a number of heat exchangers the circulating medium is compressed by the compressor 15 and is fed through a first heat exchanger 18 where the exhaust losses of the turbine are used and.