Alsthom-atlantique

Alsthom

Jean-Claude Comensoli

Jean Delassus

Paul Pouger

Michel Gey

A method of extracting packets of blades (1) insertable radially into a disk (5) of a steam turbine rotor, for the purpose of being fixed therein. The flat situated above the feet of the blades are clamped and then pulled out radially. Apparatus for performing the method comprises two levers (15) hinged to each other such that moving the rear arms (18) apart causes the front arms (17) fitted with jaws (20) to clamp against the flats of the blades. Actuators (23) move the entire apparatus (14) radially away from the disk (5). The packets of blades (1) are extracted without being damaged and they may be reused after the disk (5) has been repaired.

Method for extracting packets of blades from a steam turbine

The protection device comprises two half cages (13, 14) superposed on each other and surrounding the rotor (8) under test. The half cages together constitute a cage with openings between its bars and provided with water cooling in said bars. The cage ensures that the magnetic field generated by a rotor under test with excitation current is stopped within a distance equivalent to the size of the holes between the cage bars. Induced current heating in the cage is kept under control by water cooling, and metal objects outside the cage are substantially protected from the magnetic field by the cage. Air can pass freely through the cage, and the rotor can be observed without removing the cage.

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Gonesse, France

Jean-Claude Comensoli