Abstract: A method for manufacturing a hollow structure suitable for example as reservoir for pressurized fluids, which structure is obtained by curving over a part of its length a corrugated tube provided circumferentially in the hollow of its waves with a hardenable fiber reinforced composition, then subjecting the tube thus curved over at least a part of its length to a treatment for hardening the hardenable composition. The tube may comprise longitudinal reinforcements (braid or layers of widely spaced helical wires), the ends of the tube being possibly equipped with systems for communicating with the outside or for sealing, the final shaping being followed by a treatment for hardening said composition. The winding of the tube may be carried out about a central core or drum.

Abstract: A lightweight structure for containing fluid under pressure, the structure having no inner seal sheath and including a cylindrical zone formed with a single sheath consisting of a composite material which avoids microcracking phenomena provided by differential pressure existing betweeen an environment surrounding the structure and the pressure of the fluid within the structure. The sealed sheath remains sealed up to a pressure that is very close to the burst pressure of the structure. The composite material is made up of a polyamide 12 matrix and of carbon fibers embedded in the matrix to withstand longitudinal and transverse components of the differential pressure.

Abstract: Antiabrasion curved section made of reinforced curved plastic material and comprising in at least one of a lower portion and an upper portion an antiabrasion material. A plurality of antiabrasion sections are produced inside a profiled mold having a plurality of grooves in which is arranged the antiabrasion material of the lower faces. Reinforced filaments impregnated with a stabilizable resin are supplied to the mold and, finally, the antiabrasion material of the upper faces is applied. The mold is wound on a mandrel and the plastic material is stabilized before removing the mold sections which form a unitary assembly dividable particularly during the stranding of arm rings.

Abstract: The present invention relates to a mandrel for manufacturing a part made from a composite material according to the filament winding technique.The mandrel includes a composite material layer whose threads are wound circumferentially round a metallic casing.The overall thermal expansion of the mandrel according to the invention is close to the expansion of the reinforcing fibers of the parts manufactured on the mandrel.The invention further relates to a use of the mandrel for manufacturing curved elongated profiles.

Abstract: A process for manufacturing high-pressure tanks of low weight with an armored corrugated metal sheath, a corrugated pipe is circumferentially armored, with the metallic tank being introduced into the armored corrugated pipe. An assembly which includes the armored pipe and the tank is longitudinally armored except for oppositely disposed openings of the pipe and the metallic tank. The material of the metallic tank is caused to creep through plastic deformation under an effect of an internal pressure in order to obtain a corrugation of the cylindrical part of the metallic tank.

Abstract: The present invention relates to a method for forming a pipe with a corrugated wall by means of the electroforming technique. The method comprises the stage of forming, possibly partial, on the circumference of the pipe over a length of about one pitch of the corrugation. The corrugated deformation of the pipe is obtained by step-by-step forming after moving the forming mandrel longitudinally in the pipe. The invention also relates to a device for forming a corrugated pipe. In a variant, the device comprises a cylindrical mandrel on which a groove deepens over a circumference portion and continues at the depth of the corrugation to be formed.

Abstract: A mechanical linking device connects two elements. The device includes resin-coated fibers wound round a principal axis and forming a loop around at least one hole having an axis substantially orthogonal to the principal axis. The device is made using a process for manufacturing a mechanical part through filament winding around a spindle brought into rotation about an axis. Some of the windings use the axis of rotation as the axis and other windings are about a winding axis different from the axis of rotation.

Abstract: The present invention relates to a method and to a device for manufacturing parts made from resin and reinforcing fibers by winding. Molding means including a plurality of female forms corresponding each to a print of the part to be manufactured are produced. The forms are arranged one after the other, substantially helically, so as to make a continuous groove, then said groove is filled by winding with fibers coated with a polymerizable resin by rotating the prints round the axis of the helix.

Abstract: The present invention describes a tank for fluids under pressure and the manufacturing process thereof. The tank consists of two bottoms (3, 4) separated by a corrugated cylindric zone (2), the corrugated cylindric zone being circumferentially armed, and of a longitudinal reinforcement (7) placed on the total outer structure of the tank which, while reproducing the bottom effect, allows to reduce the thickness of the bottoms and to lighten the tank. The process describes the manufacturing of a circumferentially and longitudinally armed tank.

Abstract: Described are engravable coating compositions, in particular for printing cylinders, which comprise at least one resin capable of undergoing coking and producing only a very small proportion of products which are liquid at the temperature at which it decomposes, the main products of decomposition thereof being solid or gaseous at that temperature;and in general a reinforcing particulate filler having a small proportion of edges having acute projecting angles, said filler generally representing a proportion of from 5 to 75% of the resin+filler volume.The process for coating the cylinders comprises:mixing the resin and the filler and degassing the mixture produced;the coating operation in the true sense and drying the layer or successive layers deposited; andbaking the coating.

Abstract: The present invention relates to a device for detecting traces of hydrocarbon-containing pollutants present in an aqueous medium, comprising an electric circuit including at least one sensitive element reacting through degradation to the presence of said pollutants, electric means co-operating with said sensitive element and a means for checking the condition of said circuit.According to the invention, said electric means include at least two contactors holding said sensitive element in compression.FIG. 1 to be published.

Abstract: A tube includes a tubular part of composite material with a thermosetting resin matrix. A metallic end coupling member is connected to one end of the tubular part and is engaged at least partially inside the tubular part. A tubular covering member of impermeable material is placed over the inner face of the tubular part and is integrally attached to the tubular part. An impermeable joint is formed between the end coupling member and the covering member. The inner face of the tubular part is covered by the end coupling member and the covering member.

Abstract: An apparatus for the sizing of a shaped extended element having a longitudinal axis and including lateral surfaces extending substantially parallel to the axis. The apparatus includes a wheel rotatable about an axis. The wheel includes at least one planar ring-shaped surface extending perpendicular to the axis of the wheel and centered on the surface. The ring-shaped surface cooperates with the lateral surface of the shaped elongated element during a displacement of the wheel relative to the element along an axis parallel to the longitudinal axis of the element. A coating device is adapted to deposit, at least on the outer circumference of the wheel a sufficient amount of glue for allowing a sizing of the lateral surface of the shaped element.

Abstract: Antiabrasion curved section made of reinforced curved plastic material and comprising in at least one of a lower portion and an upper portion in antiabrasion material. A plurality of antiabrasion sections are produced inside a profiled mold having a plurality of grooves in which is arranged the antiabrasion material of the lower faces. Reinforced filaments impregnated with a stabilizable resin are supplied to the mold and, finally, the antiabrasion material of the upper faces is applied. The mold is wound on a mandrel and the plastic material is stabilized before removing the mold sections which form a unitary assembly dividable particulary during the stranding of arm rings.

Abstract: A process for manufacturing a metallic tank involves placing a metallic inner sheath of average plastic strain having two ends separated via a cylindric zone within a cylindric corrugated tube having hollow outer parts provided with reinforcing elements and expanding the metallic inner sheath by compression to conform to the corrugated tube. In the process, a tube for preventing longitudinal buckling of the corrugated tube is placed around the assembly of the corrugated tube and the metallic sheath.

Abstract: A tank or bottle including two end portions separated by a corrugated cylindrical body, with the corrugated cylindrical body being circumferentially reinforced. A longitudinal reinforcement is disposed along an entire outer surface of the tank with the exception of openings provided in the end portions for accommodating closure elements, whereby it is possible to reduce a thickness of the end portions and to reduce the overall weight of the tank.

Abstract: A method and apparatus for the sizing of a shaped extended element having a longitudinal axis and including lateral surfaces extending substantially parallel to axis. The apparatus includes a wheel rotatable about an axis and with the wheel including at least one planar ring-shaped surface extending perpendicular to the axis of the wheel and centered on the surface. The ring-shaped surface is adapted to cooperate with the lateral surface of the shaped elongated element during a displacement of the wheel relative to the element along an axis parallel to the longitudinal axis of the element. A coating means is adapted to deposit, at least on the outer circumference of the wheel a sufficient amount of glue for allowing a sizing of the lateral surface of the shaped element.

Abstract: A device for carrying out at least one of measuring or servicing operations in a well, with the device including a rod which is stiff against compression and elastic in flexure and a measuring instrument fastened to an end of the rod. The rod includes a core having a flattened cross sectional shape adapted to provide the rod with a high flexibility in flexure in a first plane, with respect to a flexure in a plane orthogonal to the first plane. At least one energy or information transfer line is incorporated or embedded during manufacturing the core which is made of a composite material. A sheath embedded in the core so as to provide the rod a substantially cylindrical outer shape. The device is applicable to be used in a well producing an oil effluent.

Abstract: A method and device for simultaneously producing a plurality of curved profiled reinforcement bars of a material stabilized by a mold helically wound on a mandrel, with the mold including a plurality of grooves in which are arranged reinforcing elements. The reinforcement bars are disposed on a support, with the support being moved when the bars are set in place to form an armature of a body. When the bars are produced in the mold with the plurality of grooves, the mold is used as a support part or a laying support.

Abstract: A device for carrying out at least one of measurements and interventions in a drilled well, with the device including a rod and an instrument for at least one of measuring and intervention disposed at a lower end of the rod. The rod is flexurally elastic and compressively rigid and includes at least one line for carrying energy or information with such line being, for example, an electric, fluid or optical line. The rod is constructed so as to be wound onto at least one winch and is fashioned of one of a composite or polymer non-composite material.