Abstract: A device for fixing a perforated sheet (8) against the perforated tube plate (1) of a heat exchanger having a bundle of tubes (4, 5), the perforated sheet (8) controlling the rate of fluid flow along the tubes, and the device comprising hollow pins (10) inserted in the ends of some of the tubes (4) and expanded therein, the hollow pins terminating outside the tubes with threaded ends (12) onto which respective nuts (15) are screwed for clamping the perforated sheet against the perforated tube plate, the nuts having heads including respective axial fluid-flow controlling bores (17).

Abstract: A support or fixing device for pipes whose walls are thin in proportion to their diameter and which are subjected to great temperature variations and/or which must be protected against earthquakes. It includes a collar 3 which surrounds the pipe and is spaced apart therefrom and is pierced with holes 12 at least at two points symmetrically disposed, fittings 11 welded to the pipe at the center of said holes, connection parts 15 engaged in each of the fittings and flexible strips 17 welded on one side to the connection parts and on the other side to parts 18 integral with the collar. Application to pipes which convey fluids which have high specific heat or to pipes which are installed at a site which is exposed to earthquakes.