FIELD: heat engineering. SUBSTANCE: fastening flexible member made, for instance, in form of plate spring 3 facilitates fastening of tubes 2 in cylindrical holes 1a of tube plate 1. End of tube 2 has circular flange 2a made integral with tube. Flange 2a adjoins bearing surface 1b. Additional ring 4 is arranged between tube 2 and bearing surface 1b. Circular groove can be made around hole 1a to form bearing surface. Moreover, circular flange 2a can be made with V-shaped cross section, and sealing ring 4 can be arranged inside flange 2a for engagement with flange and with corresponding bearing surface. EFFECT: enlarged operating capabilities. 5 cl, 3 dwg
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