Abstract: The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

Abstract: The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

Abstract: The present application describes a method for welding two parts to each other. The two parts are made from steel having a high thermomechanical yield strength. The welding method includes a welding step in which a weld bead is created inducing a heat-affected zone to appear. The method also includes a heat treatment step having a heating step, during which at least one portion of the weld bead and the HAZ is gradually heated to a treatment temperature; then a holding step in which the portion of the weld bead and the HAZ is kept at the treatment temperature; then a cooling step in which the HAZ and the weld bead are gradually cooled and pass from the austenitic transformation end temperature to the martensitic transformation end temperature of the steel of the parts in a time between 7.5 s and 8.5 s, and pass from the austenitic transformation end temperature to the martensitic transformation end temperature in a time shorter than 15.5 s.

Abstract: A device for the cathodic protection of a metal wall against corrosion in a saline environment, includes an anode and means for connecting said anode to said wall. The anode has a higher electrochemical potential than the wall, wherein the anode is placed in a compartment delimited by a wall permeable to electrons and, optionally, to water. The device includes a porous outer layer made from a material selected from: polymeric materials, ceramic materials or hydrated inorganic materials and at least one porous layer having the ability to collect the cations emitted by the anode during the dissolution of same. The material forming the at least one layer is selected from osmotic membranes, active carbon, a cation exchange resin such as a zeolite, a cation-collecting polymer with nanofillers, cation-collecting mineral compounds such as phyllosilicates and inosilicates, cation-retaining nanofiltering semi-permeable organic microporous membranes.

Abstract: A method for deburring a ceramic foundry core obtained by injecting a ceramic paste, the paste including a binder having a predetermined glass transition temperature, into a mold and having at least one surface portion with a surplus of material forming a burr to be eliminated. The method includes the following stages: a) disposing and attaching the molded, unfired foundry core onto a mounting; b) placing a milling tool, having an elongated shape with a helically cut edge, onto a tool holder; c) causing the tool to rotate around its axis and touching the milling tool to the surface portion to be deburred; and d) freezing the surface portion to be deburred such that the foundry core is maintained at a temperature lower than a glass transition temperature during the deburring operation.

Abstract: A method for protecting a component of a hydraulic machine against erosion comprises steps involving preparing, in the flat state, several sheets of polymerised synthetic material, in applying a coat of adhesive to one side of each sheet 300 and in laying the sheets on the surface of the component that is to be covered with the layer of coating.

Abstract: This hydraulic machine member has at least one flow of water passing through it, and comprises at least one wetted surface extending between two edges of the member, at least one of the edges of the member and part of the adjacent wetted surface being reinforced and formed by at least one removable solid element made from material having a high resistance to abrasion.

Abstract: The device (100) serves to separate solid particles from the water of a flow (E) feeding a hydraulic machine of the turbine, pump, or turbine-pump type. The device has flow inlet and outlet zones (104, 105) for the flow that are spaced apart along an advance axis (X100) of flow advance through the device (100). The device (100) comprises a plurality of ducts (110) placed in parallel, each having a mouth and a downstream end between the inlet zone (104) and the outlet zone (105). In section perpendicular to the advance axis (X100), each duct presents a section in the form of a spiral with a radius of curvature that increases from the mouth towards the downstream end or from the downstream end towards the mouth, with each duct (110) presenting a thickness measured in a generally radial direction relative to the advance axis that is less than 10% of the width (l110) of said duct, measured parallel to said axis (X100).

Abstract: A tool for manufacturing a casting core, for a turbomachine blade with a leading edge and a trailing edge, the core includes a thick part on the leading edge side and a thin part on the trailing edge side is disclosed. The tool includes first and second dies of the core that are moveable in a direction with respect to each other between a molding position and a demolding position, sub-components that are moveable relative to the dies, and mechanical ejectors that are provided on the first and second dies. The parts of the dies corresponding to the thin part of the core do not include a movable sub-component. The thin part of the core is demolded along the main direction of opening of the first and second dies.

Abstract: The present invention relates to a method for deburring a ceramic foundry core (10) obtained by injecting a ceramic paste, said paste including a binder having a predetermined glass transition temperature, into a mold and having at least one surface portion with a surplus of material forming a burr (B) to be eliminated. The method is characterized in that it includes the following stages: a) disposing and attaching the molded, unfired foundry core (10) onto a mounting (300); b) placing a milling tool (100), having an elongated shape with a helically cut edge, onto a tool holder; c) causing the tool to rotate around its axis and touching the milling tool to said surface portion to be deburred; and d) freezing (400) the surface portion to be deburred such that the foundry core is maintained at a temperature lower than said glass transition temperature during the deburring operation.

Abstract: The device (100) serves to separate solid particles from the water of a flow (E) feeding a hydraulic machine of the turbine, pump, or turbine-pump type. The device has flow inlet and outlet zones (104, 105) for the flow that are spaced apart along an advance axis (X100) of flow advance-through the device (100). The device (100) comprises a plurality of ducts (110) placed in parallel, each having a mouth and a downstream end between the inlet zone (104) and the outlet zone (105). In section perpendicular to the advance axis (X100), each duct presents a section in the form of a spiral with a radius of curvature that increases from the mouth towards the downstream end or from the downstream end towards the mouth, with each duct (110) presenting a thickness measured in a generally radial direction relative to the advance axis that is less than 10% of the width (l110) of said duct, measured parallel to said axis (X100).

Abstract: This hydraulic machine member has at least one flow of water passing through it, and comprises at least one wetted surface extending between two edges of the member, at least one of the edges of the member and part of the adjacent wetted surface being reinforced and formed by at least one removable solid element made from material having a high resistance to abrasion.

Abstract: The present invention relates to a ceramic core used in the manufacture, by lost wax casting, of a turbomachine blade with cooling cavities and a squealer, comprising at least one main core, wherein the main core (10) comprises an element (10B) shaped so as to constitute the squealer and an element (10SB) shaped so as to constitute at least one cavity beneath the squealer, the two elements leaving between them a space (13) shaped so as to constitute, at least in part, the bottom wall of the squealer. In particular, the elements (10B and 10SB) are joined together by ceramic rods (TG).

Abstract: A process for manufacturing a ceramic foundry core having at least one thin region with a thickness “e”, in particular in of a turbomachine blade trailing edge, including the forming in a mold of a mixture including a ceramic particle filler and an organic binder, the extraction of the core from the mold, the binder removal and consolidation heat treatment of the core. The process is one in which a core is formed in the mold, the region of this core being thickened relative to the thickness “e” by an overthickness E and in which the overthickness is machined after the core has been extracted from the mold and before or after the heat treatment operation. In particular, the machining is carried out mechanically by milling, either with removal of chips on the cores before firing, or by abrasion on the fired cores.

Abstract: A method of manufacturing a cast core with at least one recess, corresponding to a partition of a turbomachine blade, includes the steps of shaping, in a mold, a mixture containing a ceramic particles filler and an organic binder; forming a core rough casting without the recess in the mold; extracting the core rough casting from the mold; machining the recess in the core rough casting thereby forming a machined core with the recess; removing the organic binder from the machined core; and heat treating the machined core to consolidate the machined core. The step of machining the recess is performed before the step of heat treating the machined core.

Abstract: The present invention relates to a tool for manufacturing a casting core, for a turbomachine blade with a leading edge and a trailing edge, the core (10) comprising a thick part on the leading edge side and a thin part (10A1) on the trailing edge side, comprising first and second dies (530, 540) of the core that can move in a direction (F?1 and F?2 respectively) one with respect to the other between a molding position and a demolding position, where appropriate with sub-components that can move relative to the dies, wherein the parts of the dies corresponding to said thin part of the core do not include a movable sub-component, mechanical ejectors (570) being provided on one or other of the dies, in such a way that the thin part (10A1) of the core is demolded along the main direction of opening.

Abstract: The invention relates a process for manufacturing a ceramic foundry core having at least one thin region with a thickness “e”, in particular in of a turbomachine blade trailing edge, comprising the forming in a mold of a mixture comprising a ceramic particle filler and an organic binder, the extraction of the core from the mold, the binder removal and consolidation heat treatment of the core. The process is one in which a core is formed in said mold, said region of this core being thickened relative to the thickness “e” by an overthickness E and in which said overthickness is machined after the core has been extracted from the mold and before or after the heat treatment operation. In particular, the machining is carried out mechanically by milling, either with removal of chips on the cores before firing, or by abrasion on the fired cores.

Abstract: The present invention relates to a ceramic core used in the manufacture, by lost wax casting, of a turbomachine blade with cooling cavities and a squealer, comprising at least one main core, wherein the main core (10) comprises an element (10B) shaped so as to constitute the squealer and an element (10SB) shaped so as to constitute at least one cavity beneath the squealer, the two elements leaving between them a space (13) shaped so as to constitute, at least in part, the bottom wall of the squealer. In particular, the elements (10B and 10SB) are joined together by ceramic rods (TG).

Abstract: The invention relates to a method of manufacturing a cast ceramic core comprising at least one recess, particularly for partitions, for a turbomachine blade in particular, comprising the shaping in a mould of a mixture containing a ceramic particles filler and an organic binder, extraction of the core from the mould, removal of the binder and a heat treatment to consolidate the core. The method is characterized in that a core rough casting without the said recess is formed in the said mould and in that the said recess is machined once the rough casting has been extracted from the mould and before the heat treatment operation. In particular, the machining operation is performed mechanically by milling with the removal of chips. The invention also relates to a tool suited to implementing the method.

Abstract: A composition for the preparation of articles of calcium oxide, comprising calcined calcium oxide and an organic phase consisting of at least one polyol in an anhydrous medium. The composition may be used to form linings for molds and crucibles intended to come into contact with molten metals of groups IV and V of the periodic table.