Cylindrical shell and tube heat exchanger, wherein the shell is radially held inside an external shell

摘要

Steam generator in particular nuclear reactors pressurized water comprising a bundle of tubes (2) arranged in a bundle casing (5).; The bundle casing (5) has openings in its wall, each corresponding to a supporting part (20) along the edge of which are fixed sleeves (15) projecting radially into the space between the casing (5) and the outer wall (3) of the heat exchanger. Each of the bearing pieces (20) comprises two cylindrical parts located in the extension of one another, a large-diameter portion (20a) welded by its side surface inside the sleeve (15) and a part small diameter (20b) intended to bear on the casing (3). Shims (23) are interposed between the portion (20a) of the supporting part (20) and a spacer plate (8) of the heat exchanger.