Abstract: The present invention relates to abradable rings for turbines, wherein they are constituted by an abradable refractory material and are formed by at least one open ring maintained clamped against a fixed metallic structure with the aid of at least one spring, and to refractory materials which may be used for making said rings.

Abstract: Bearing for rotary shaft, of the type comprising at least one bearing element with a friction surface contacting with one external surface of the shaft. The bearing element comprises a bearing block on which is defined the friction surface and a support housing having an opening for receiving the block. The block and the housing are separated over the whole periphery of the opening by a gap, and joined together resiliently through the gap. The block and housing together define a closed cavity filled with a substantially incompressible fluid.

Abstract: The foam is produced by mixing an isocyanate with a polyalcohol from a tight storage tank with two compartments, each of which contains one of the aforementioned products, the upper part of the tank being provided with a solid propellant trip or starter, which generates a pressurization gas form the tank. In the lower part of the storage tank, there is a pressure threshold mixer, whose operation is automatically controlled by the pressure prevailing in the tank and which has a mixing chamber entered (under the effect of the same pressure) by the isocyanate and the polyol via lateral injection nozzles, which produce a rotation of the mixture, the polyols being previously emulsified by a neutral gas (such as air or nitrogen) from a pressurized storage container.

Abstract: An articulated pipe line comprising rigid sections jointed together so as to allow a limited angular movement between adjacent sections, the axis of two successive articulations having different directions and a sealing device ensuring a tight separation between the outside and the inside of the pipe line at the level of the articulation. This device is particularly suitable for immersed pipe lines of large diameter.

Abstract: A device for subjecting n (n .gtoreq. 1) test specimens to alternate tensile and compressive stresses comprises an excitation source having a horizontal axis of displacement and a guide rod which is capable of free translational displacement along a horizontal axis. The guide rod is rigidly fixed at one end to the exciter and provided at the other end with means for clamping the ends of n test specimens. A massive part is provided with nozzles for the injection of a gas under pressure and with n horizontal bearing blocks constituting gas bearings for n cylindrical and horizontal masses to which the other ends of the test specimens are secured.