Abstract: The method of protecting a component of a turbomachine from liquid droplets erosion provides covering at least one region of a component surface exposed to a flow of a fluid containing a liquid phase to be processed by the turbomachine with a protective layer. The protective layer consists of a plurality of adjacent sub-layers of different materials having high hardness in the range of 1000-3000 HV and low fracture toughness below 20 MPam1/2. The materials are typically nitrides or carbides of titanium or aluminum or chromium or tungsten. In an embodiment, the covering is carried out by a PVD technique, in particular by Cathodic Arc PVD, or a CVD technique. The method may be applied to any component of turbomachines, but it may be particularly beneficial for parts of centrifugal compressors.

Abstract: A motor compressor unit including a common housing sealed with respect to a gas to be compressed, a motor mounted to the common housing, and a compressor mounted to the common housing. The motor is mounted in an inner casing fastened in the common housing by at least one removable fastening device such that the motor and the inner casing form a removable cartridge.