PROCESS AND DEVICE FOR COMPRESSING BY HAMMERING A STEAM GENERATOR TUBE SWAGED IN A TUBE PLATE

摘要

To carry out a hammer-compression of a steam-generator tube 1, a high-velocity gas stream laden with particles of a granulometry of between 50 and 500 mu m is directed onto the inner surface of the tube 1 in the transitional zone 7 of this tube between its deformed part on the inside of the tube plate 2 and the non-deformed part. The gas jet is directed onto the inner surface of the tube 1 in radial directions and over the entire periphery of this tube. The mass flow rate of the particles is higher than 0.010 kg/sec. The device comprises a flexible sleeve 20 movable within a casing 16, 18 fastened sealingly under the tube plate 2 around the tube 1. An injection nozzle 21 and a guide means 22 are arranged at the end of the sleeve 20 receiving the particle-laden gas.