Abstract: This invention relates to a gas-turbine engine which is provided in the turbine interior with a bearing chamber for a turbine shaft, the bearing chamber being sealed by sealing elements, and with a scavenge line for the lubricating oil which is supplied to the bearing chamber, in particular is sprayed onto the bearing(s) arranged therein. In accordance with the present invention, the single scavenge line, which is connected to a suitable lubricating-oil collecting compartment, features such an ample cross-section and the sealing elements have such a high sealing effect that the pressure in the bearing chamber is essentially equal to the pressure in the lubricating-oil-collecting compartment and maximally half the pressure in the turbine interior.

Abstract: A means detecting the flow of the steam at the gateway of the steam cooling system is provided, and the timing of the finish of the warm-up process of the steam cooling system at start-up is decided by the difference of the flow of the steam at the gateway. In case of the difference between the flow of the steam at the inlet and the flow of the steam at the outlet is below a permitted value, it is considered that residual air and drainage have been purged, the warming-up is finished, and the step for starting the gas turbine can be performed.