Turbomachinery a maintenance system for long duration position

Turbomachine (10,210,310) provided with a rotor (10R, 110R) and a stator (10S) having radial positioning means (40,42; 240.242; 340.342) ensuring radial positioning of the rotor; an axial balancing device without contact (38) arranged on at least one impeller, ensuring the axial balancing of the rotor (10R, 110R) at high speed. The turbomachine has an axial stop (36,136) separate from the radial positioning means (40,42; 140,142) ensuring the axial balancing of the low speed rotor and high speed without contact. In addition, the radial positioning means are hydrostatic bearings, the turbomachine comprising supply circuits (44,46,48) of the hydrostatic bearings suitable for connecting these bearings to a source of pressurized fluid. In this way, operation at high speeds, with a very long life is obtained.