Abstract: A steel strip laminate pipe having increased lap shear strength and peel off strength between the steel layers in the pipe and a method for making such a steel strip pipe are provided. Steel strips coated with a sol-gel or a silane adhesion promoter are wound over an inner lining to form steel layers bonded to each other in a steel strip laminate pipe. In an alternate embodiment, fiber fillers and resin are used to bond the steel layers in the pipe together. In further embodiment, glass sphere and resin are used to bond the steel layers together. The steel strips bonded together using continuous reinforced fiber filler or glass spheres may be coated with sol-gel or silane. In an alternate embodiment, the sol-gel or silane may also be mixed in the resin used to bond the steel layers together.

Abstract: This one-piece subsea flexible multilayer tubular pipe comprises a carcass (1) made of interlocked metal strip, an inner sealing sheath (2) made of a polymer material, a winding of an interlocked metal element (3) wound in a helix with a short pitch, at least one ply (5) of tensile armor layers wound with a long pitch around the pressure vault, where appropriate at least one thermal insulation layer (7) and an outer protective sealing sheath (8); this pipe has, over its length, sections intended for regions of different use and the physical characteristics of at least one of the layers are modified at manufacture over at least one section of the length of the pipe, without modifying the outside diameter of the said layer, so as to tailor the properties of the pipe in this section to the conditions for the zone in which it will be used.

Abstract: Composite fiber reinforced structures, such as pipes or storage tanks, having improved resistance to microcracking and delamination and improved containment strength are disclosed. The walls of the structures comprise at least one layer comprising a plurality of continuous reinforcing glass fibers having an average diameter of ≦about 10 microns impregnated in a resinous binder such as a thermoset epoxy resin.

Abstract: Flexible pipe for transporting fluids, comprising, from the inside outwards, a flexible metal carcass with a helical winding of non-contiguous turns, a compressible rod fitted into the gap between the consecutive turns of the helical winding, the compressible rod has a substantial volumetric deformation in compression of at least 50%, an internal sealing sheath extruded over the said metal carcass, at least one ply of armours wound around the said internal sealing sheath and at least one external sealing sheath arranged around the said ply of armours, the rod, its materials, its elastic modules and other features thereof are disclosed.

Abstract: A flexible conveying element, in particular for the exhaust systems of automotive combustion engines, having a helically or annularly corrugated metal hose which is installed coaxially in the metal bellows. The outside diameter of the metal hose is smaller than the inside diameter of the bellows and the ends of the hose are situated inside the end fittings of the bellows. The metal hose has an interlocked profile and the bellows and the hose are in an at least indirect contact with each other in at least one additional zone between the two end fittings.

Abstract: It is of the unbonded type and comprises, from the inside outwards, an internal leakproof assembly comprising a pressure vault, a first inner group of tensile armor (5), a second outer group of tensile armor (7) and an external sealing sheath (8), the tensile armor of the said inner and outer groups being wound at a lay angle of less than 55.degree., characterized in that an intermediate sealing sheath (6) is inserted between the two inner (5) and outer (7), groups of tensile armor, the inner group of tensile armor (5) being wound with a short pitch and at a lay angle of greater than 35.degree. and less than 55.degree., and the outer group of tensile armor (7) being wound with a long pitch and with a lay angle of less than 30.degree..

Abstract: The present invention relates to flexible pipes with metal armors and metal tubes having a sheath made of an extrudable thermoplastic material for manufacturing an acid gas tight barrier.The sheath comprises a determined proportion of at least one charge of a product chemically active with acid gases so as to irreversibly annihilate the corrosive effects of these gases, the proportion being determined as a function of the gas permeability of the thermoplastic material.

Abstract: Two hard steel wire-made reinforcing wires and two synthetic resin wires which are harder than a soft synthetic resin pipe wall are alternately wound spirally on an inner side of the synthetic resin pipe wall while keeping predetermined intervals.

Abstract: A flexible piping structure has in combination, from the axis of the pipe towards the exterior, a cylindrical, metal inner sealing tube, a layer resistant to internal and external pressures and a sealing sheath made from extruded plastics material. In one embodiment, an intermediate layer of plastics material is arranged between the tube and the pressure-resistant layer.

Abstract: The use of a buried or covered flexible seabed pipeline for transporting fluids is disclosed. The pipeline comprises a sealing barrier (3) and reinforcing layers (4, 5) capable of withstanding mechanical stress and arranged around said sealing barrier. The reinforcing layers consist of at least two crosswise-arranged reinforcing plies (4, 5) of wires helically wound at respective winding angles a.sub.i to the longitudinal axis of the pipeline, such that they comply with the following relationships: when i=1, 2, . . . , 52.degree..ltoreq.a.sub.i .ltoreq.58.degree.. The arithmetic mean a.sub.m of said winding angles a.sub.i complies with the following relationship: 53.degree..ltoreq.a.sub.m .ltoreq.57.degree..

Abstract: A reinforced flexible tube having at least one helically wound elongated reinforcing element. The elongated reinforcing element has a T-shaped cross-sectional profile.

Abstract: A length-controlled flexible hose includes a body formed by spiral-winding a continuous metal band with interlocked leading and trailing edges. A length control adhesive strip is applied to the flexible hose along a surface thereof and minimizes length changes of the flexible hose whereby a design or engineered length can be maintained. A method of manufacturing a length-control flexible hose includes the steps of spiral-winding a continuous metal band, interlocking leading and trailing edges thereof and applying a length control adhesive strip to a surface thereof.

Abstract: It is of the type comprising a corrugated and sealed internal metal tube (1), a pressure vault (2) wound at a short pitch and having an internal surface which faces the corrugations of the corrugated internal tube, an intermediate sheath, at least two groups of inner and outer armoring layers (3, 5), the armoring layers being wound at a lay angle of less than 55.degree., and an outer-sheath (6), and it is characterized in that the intermediate sheath (4) is sealed and is arranged between the two groups of armoring layers (3, 5), the said inner group of armoring layers (3) bearing directly on the pressure vault (2).

Abstract: A continuous method of extruding an oriented plastic article of improved strength. A chemically reactive polymer, monomer or other compound is included in the matrix material(s) and a (multilayer) parison is extruded or melt formed having built-in thermoplastic orientation caused by shear or caused by elongational flow. A reaction can be activated in the molten state thereof by additional heat resulting in a cross-linked structure or at least the mobility of the molecules being reduced, resulting in a longer relaxation time which makes the freezing of permanent orientation possible. The soft matrix can be stretched while still hot in the hoop and/or axial direction. Then, the product thus obtain is calibrated and cooled in an oriented state.

Abstract: A heat protective sleeve for the protection of elongated members is disclosed, the sleeve having a first sheet of insulative material with an outer reflective layer. Oppositely disposed edges of the first sheet have means for joining the edges to a portion of the first sheet in overlapping relationship to form a tubular sleeve. A second insulative sheet is attached to the outer surface of the first sheet inward from the edges. The second sheet also has a reflective layer on its outer surface and is attached to the first sheet along its edges, parallel to the edges of the first sheet, thus, forming an air pocket between the sheets. A stiff monofilament wire bent into a spiral or other shape is disposed within the air pocket to maintain the pocket shape. In use, the air pocket is positioned facing a heat source and the sleeve interposes a reflective layer, an insulating layer, an air pocket, a second reflective layer and a second insulating layer between the elongated members and the heat source.

Abstract: A tubular structure (10) including an expanded fluoropolymer material having an outer surface (12), an inner surface (14), and a wall (16) therebetween. The wall (16) defines a channel (18). A hose assembly (100) includes a tubular inner liner (110) formed of the expanded fluorocarbon polymeric material having an outer surface (112), an inner surface (114), and a wall (116) therebetween defining a channel (118). The hose assembly (110) further includes at least one outer liner (121) disposed about the outer surface (112) of the tubular inner liner (110). A method of making a tubular structure (10) formed of the expanded fluoropolymer material includes the steps of extruding a fluoropolymer tubular structure (10) having an outer surface (12), an inner surface (14), and a wall (16) therebetween defining a channel (18) on an extruder having at least one barrel, at least one screw, at least one mandrel, and at least one die.

Abstract: A high pressure subsea pipe, particularly for underwater use, has the ability to flex while being transported and installed. The pipe has a friction reinforcement structure made of overlapping layers increasing substantially the capacity of the pipe in longitudinal direction. The reinforcement layer may be a helical wrap, either cylindrical or conical, or conical sleeves nested within one another. An articulated carcass has turns of a helically wrapped main and ancillary wires, offering no axial slack in either tension or compression or in both directions while remaining flexible.

Abstract: The invention concerns a flexible conduit comprising an internal gasproof undulating metal tube (1), the wall of which has helical undulations (8), the external surface of said internal tube having at least concave (10) and convex (11) rounded parts corresponding to the internal and external parts of the undulations respectively, and at least an arch (2) arranged around said internal metal tube and made up of at least a form wire (9) coiled in spires. The invention is characterized in that the arch (2) has an internal surface with helical undulation, comprising at least concave (16) and convex (15) rounded parts and the external surface of the internal metal tube is supported in its concave rounded part (10) by a convex part (15) of the arch (2) internal surface and in its convex rounded part (11) by a concave part (16) of the arch internal surface, said internal arch surface and said internal tube external surface matching in form and the interstices (i) between the adjacent spires are small.

Abstract: A flexible, high pressure gas safety hose assembly is provided. The safety hose assembly has a tube with a first end and a second end, and a metal braid covering the tube. The hose assembly also has an inner fitting connected about the tube at the first end and at the second end, respectively, as well as a spiral spring guard wrapped around the braid covering the tube. An connection fitting having an integral inner flange is provided at the first end and at the second end of the tube. A collar is crimped over the spring guard to secure the spring guard to the integral inner flange of the connection fitting at the first end and at the second end of the tube. A method of manufacturing a safety hose assembly without welding is also provided.

Abstract: It is of the type comprising at least, from the interior towards the exterior, an internal non-impervious metal carcass (1), the exterior surface of which has interstices (9), an internal impervious polymeric sheath (2), a set of layers of reinforcement wires (3) (4), and an external protection sheath (5), and is characterized in that said internal impervious polymeric sheath (2) mainly comprises a thermoplastic polymer part associating at least two fluoromonomers, at least one of said fluoromonomers carrying at least one alkoxy group, the thermoplastic polymer part being blistering-resistant at a temperature of at least 130.degree. C.

Abstract: A one piece integrally formed liquid tight connection or "whip" assembly for electrically interconnecting electrical appliances, such as air conditioning units, hot tubs, swimming pools and outdoor lighting fixtures, to one another and/or to a power source junction box or control box. The connection assembly includes a flexible tubular conduit, preferably constructed from a composite of full rigid PVC and flexible plasticized PVC, having first and second end portions and an outer surface with a plurality of surface irregularities. A pair of end fittings are integrally attached to the first and second end portions of the tubular conduit, respectively, using either a solvent welding or temperature welding technique. When using the solvent technique, the plurality of surface irregularities operate to hold additional localized amounts of solvent which further reacts with the plastic in the end fittings and conduit to yield a superior weld.

Abstract: A guiding catheter for use in coronary angioplasty and other cardiovascular interventions which incorporates a transition element in the shaft of the device. The transition element which has a different flexibility than the sections immediately proximal and distal to it, creates a zone in the catheter shaft which is either more or less flexible than the rest of the shaft. The transition element allows a portion of the shaft to be made more rigid or more flexible, without changing the flexibility of the other portions of the shaft. The transition element also allows for a differential flexibility to be added to the catheter shaft.

Abstract: A flexible tubular pipe is provided having, from the inside outward, an inner sealing sleeve or tube, and an armoring including multiple armoring webs. The armoring is made up of a first armoring web on which the inner sealing sleeve or tube rests, the first armoring web including multiple interlocked wires wound with an angle A1 less than 80.degree. in relation to an axis of the flexible tubular pipe, and a set of armoring webs placed on the outside of the first armoring web, and in which at least one of the wires of the set of armoring webs is not interlocked, and is arranged so that all of the winding angles of the wires of the set of armoring webs are complementary to the angle A1, thereby obtaining a balanced flexible tubular pipe.

Abstract: A cleaner hose includes a synthetic resin pipe and four reinforcing hard steel wires disposed spirally, at predetermined intervals, in the synthetic resin pipe wall. The reinforcing hard steel wires are coated wires which are coated with synthetic resin. The pipe wall includes inner and outer layers in which an under wound tape and an upper wound tape are spirally wound while being displaced by half pitch from each other.

Abstract: A manifold assembly for supplying plastic material from a plastic source to a mold assembly in an injection molding machine includes a flexible manifold having an interior conduit connected between the plastic source and the mold assembly. The flexible manifold is configured to define an input connector, a first curved segment attached to the input connector, a second curved segment, an output connector attaching the second curved segment to the mold assembly, and an intermediary segment connecting the first and second curved segments. This provides the flexible manifold with a generally S-shaped configuration that flexes with temperature changes to maintain a substantially constant positioning between the input connector and the output connector, preventing thermally induced movement of the mold assembly with respect to the input connector as heated plastic is injected through the conduit.

Abstract: An object of the present invention is to efficiently absorb the energy of an external force applied to a vehicle body without an appreciable increase in weight of an automobile. To achieve the object, the present invention provides an impact energy absorber made of a composite in which kraft paper is placed on the outside and inside of a metal sheet such as iron foil or hard aluminum foil. The impact energy absorber is a flexible pipe having a substantially quadrangular cross section and provided with spiral-shaped concaves and convexes on the outside and inside of hard aluminum foil. The energy absorber is bonded to the room-side surface of an outer panel of the vehicle body using an adhesive. When an external force is applied to the energy absorber, the energy absorber can absorb the energy of the external force by being deformed plastically.

Abstract: A flexible tubular pipe incorporating, from the inside outward, an inner sealing sleeve or tube, and an armoring comprising a plurality of armoring webs. The armoring includes a first armoring web on which the inner sealing sleeve or tube rests. The first armoring web includes a plurality of interlocked wires wound with an angle, (A1) that is less than 80.degree. in relation to the axis of the flexible tubular pipe. The armoring also includes a set of armoring webs placed on the outside of the first armoring web, each having at least one armoring web and non-interlocking wires. The winding angle of the wires is complementary to the angle (A1), so that a balanced flexible tubular pipe is created.

Abstract: A high pressure subsea pipe, particularly for underwater use, has the ability to flex while being transported and installed. The pipe has a friction reinforcement structure made of overlapping layers increasing substantially the capacity of the pipe in longitudinal direction. The reinforcement layer may be a helical wrap, either cylindrical or conical, or conical sleeves nested within one another. An articulated carcass has turns of a helically wrapped main and ancillary wires, offering no axial slack in either tension or compression or in both directions while remaining flexible.

Abstract: A perforating gun having an elongated, spiral strip with an outer surface, cylindrical about a longitudinal axis, and a diameter sized for convenient entry and removal from a well. The strip has a series of threaded openings spaced in intervals for mounting capsule explosive charges in a phased relationship between 0 and 360 degrees. The cross-sectional area of the strip around each opening is selected to prevent fragmentation of the carrier upon detonation of the charges. The spiral strip is preferably metallic and forms a helical band with a pitch in a range of 12 to 24 inches. In each threaded opening is an explosive capsule with a hollow cap having at one end a threaded nose for attachment to one of the threaded openings. The cap has an annular, interior thread with a thread run-out of selected width at the other end.

Abstract: The hose sub-assembly is provided with a nozzle assembly at each end which includes a fitting with a flat transverse end surface. In addition, a nut which carries an O-ring in a recess at the end surface is threaded into a sleeve in which the nozzle assembly is mounted. The O-rings provide a flat surface-to-surface sealing arrangement to reduce the risk of damage to the O-ring while enhancing the sealing characteristics. Each nut and O-ring is biased against the nozzle assembly by a stretched outer metal casing.

Abstract: A flexible hose assembly for conveying gas comprising an inner tube member having a reinforcing spring coil that selectively functions as an electric heater engaging the inner surface and an outer flexible tube member having its head and outlet ends closed upon those of the inner member. A second reinforcing spring coil surrounds the outer surface of the outer member such that a dead air space or insulating chamber is formed between the two flexible tubes. Superior insulation, flexibility, energy consumption, weight and strength characteristics are achieved. A temperature responsive electrical device can be mounted near the outlet end of the inside wall of the inner tube with leads extending through the hose exiting the head end for connection to a controller for controlling an external heating or cooling system or for controlling electric power applied to the inner spring coil for directly heating the flowing gas for delivering temperature controlled heated gas to the end user system.

Abstract: A shield that is normally positioned or wrapped around a boiler tube when such tube is exposed to extreme operating conditions. This shield consists of an elongated strip of thin material that is formed as a helix. This strip also incorporates a means for spacing this strip from the tube so as to create a gap between the tube and the shield. Generally the shield is secured to the tube by spot or button welding only the longitudinal end regions of the strip to the tube. By thus wrapping and securing one or more such shields to the tube, the tube is protected while still permitting both it and the shield(s) to expand and contract as needed.

Abstract: A guiding catheter for use in coronary angioplasty and other cardiovascular interventions which incorporates a transition element in the shaft of the device. The transition element which has a different flexibility than the sections immediately proximal and distal to it, creates a zone in the catheter shaft which is either more or less flexible than the rest of the shaft. The transition element allows a portion of the shaft to be made more rigid or more flexible, without changing the flexibility of the other portions of the shaft. The transition element also allows for a differential flexibilty to be added to the catheter shaft.

Abstract: A flexible duct and method for making the duct are disclosed. The duct includes an inner wall bonded to an outer wall, so as to sandwich a wire resilient helix and a yarn helix therebetween. The yarn helix is axially displaced from the wire helix so that the turns of the yarn helix are intermediate of the turns of the wire helix. The method of manufacturing the duct includes forming the wire and yarn helix about the inner wall and bonding the outer wall to the inner wall so as to sandwich the helix between the inner and outer walls.

Abstract: A pressure-withstanding synthetic resin pipe includes an inner wall of a synthetic resin and an outer wall of a synthetic resin. A metallic reinforcement belt plate having an inverted U-shaped sectional contour and a flat, metallic belt plate having ends bent to form engagement portions and adapted to be engaged with open end portions of the metallic reinforcement belt plate are disposed between the inner wall and a protruded corrugation portion of the outer wall.

Abstract: An improved air transport hose for use in aeration systems for rejuvenating eutrophic bodies of water, said hose having low internal friction, sufficient weight to remain submerged, and resistance to mechanical damage comprising a polymeric tube encased in a flexible metal sheath of the type commonly used in electrical installations.

Abstract: An armoured flexible pipe having one or more of the following components, a pressure resistant armouring, a traction resistant armouring and/or an internal carcase, in which pipe at least one of said components comprises one or more elongated elements such as a shaped piece, a cable, a wire or a strip. The element is formed of a composite material with aluminium alloy matrix comprising reinforcement elements such as particles and/or whiskers.

Abstract: A heat reshapeable rigid conduit and method for forming an elbow or offset having any desired bend radius therefrom. The rigid conduit is formed of a flexible metal tubing with a layer of heat softenable plastic preferably covering the exterior surface thereof. The conduit may be heated using conventional electric heaters on the job site, then shaped into the desired bend radius to form an elbow or offset. The plastic layer provides rigidity to the elbow or offset upon cooling. The flexible metal tubing has interlocking overlapping joined edges that permit flexing of the tubing when the plastic layer is heat softened. The flexible metal tubing resists the sawing action of a pulling line during the installation of an electrical conductor in the conduit. The plastic outer layer permits quick and inexpensive coupling between adjacent conduit sections.

Abstract: A pressure-resistant helical corrugated pipe comprises a helical corrugated pipe wall having a top portion, opposite side wall portions extending from the top portion and a bottom portion extending from the side wall portions and disposed closed to the axis of the pipe; and belt plates which are formed separately from each other and made of a thin metal. The belt plates are disposed respectively at the side of the top portion and the side of the bottom portion as constituent elements for the pipe wall. The opposite edges of the two metal belt plates are disposed in abutted relation or in spaced opposed relation at the opposite side wall portions. The two metal belt plates are interconnected by connective portions which are made of a synthetic resin or rubber.

Abstract: Strengthening the core of an insulated flexible duct formed of a helical wire wrapped with a flexible material with reinforcing tape. Strengthening tape is applied to the surface of the duct along its entire length. The apparatus for applying the strengthening tape is a tray having adjustable wiping arms. The wiping arms stretch the duct out as it is pulled through the tray. A roll of tape is mounted adjacent to the wiper arms and is automatically applied as the duct is pulled along the tray through the wiper arms. At least two wiper arms and continuous strips of tape along the longitudinal surface of the duct core are preferred.

Abstract: The following specifications discloses a flexible duct constructed from a spiral of channel-shaped metal with the legs of the channel facing inwards of the spiral.A strip of cloth or other flexible webbing material is formed into a spiral with its overlapping edges folded into the channel of the spiral with a cord or string filling the remainder of the channel cavity before the channel legs are crimped together to maintain the webbing strips edges fast together within its grip. The expansibility of the duct is increased by increasing the width of strip of webbing.

Abstract: High-strength steel having excellent hydrogen-induced crack resistance, particularly in an environment of wet hydrogen sulfide and wires made thereof and their assembly, steel pipes, steel bands and shielding wires for marine cable are disclosed. This steel contains 0.40 to 0.70% of C, 0.1 to 1% of Si, 0.2 to 1% of Mn, up to 0.25% of P and up to 0.010% of S, and further, if necessary, 0.008 to 0.050% of Al and the balance of Fe and unavoidable impurities, and has a spheroidized structure. In addition, a flexible sour fluid transport pipe made of the high-strength steel band having the above-described composition and a tensile strength of 50 to 80 kg/mm.sub.2 is also disclosed.

Abstract: A pressure-resistant helical corrugated pipe comprises a helical corrugated pipe wall having a top portion, opposite side wall portions and a bottom portion; a continuous thin metal belt plate of a generally U-shaped transverse cross-section which is disposed in one of the top portion and the bottom portion and also in at least part of the opposite side wall portions extending from the one of the top portion and the bottom portion; another metal belt plate of a flat configuration being disposed in the other of the top portion and the bottom portion and disposed out of contact with the thin metal belt plate; and connective belt regions provided between the two metal belt plates in which the metal belt plates are absent, the connective belt regions being made of a synthetic resin or rubber to interconnect the two metal belt plates.

Abstract: Method for making a flexible hose with in cross section one flat side, and a spiral coil of a profiled strip with upright distant edges engaging with each other in adjacent windings in which said profiled strip is wound on a mandrel of suitable cross section and a discrete filling element is inserted into each of the respective hollow internal spaces of the wall during the winding of the profiled strip on the mandrel; device for carrying out this method and a flexible hose obtained by this method with discrete filling elements in the respective hollow spaces.

Abstract: A self-erecting, coiled metal tube comprises a helically wound ribbon of spring material having an inside surface and an outside surface, the ribbon having adjacent turns stressed to coil in tight overlapping and telescoping engagement, and a textured surface formed on the outside surface of the ribbon so that when the ribbon is extended, the textured surface of an underlapped turn of ribbon bears against the inner surface of an overlapped turn of ribbon to create friction between the adjacent turns of ribbon and control the length of extension of the ribbon tube and strengthen the tube.

Abstract: A flat strip-like metallic material having both surfaces coated with a first synthetic resin layer is passed between plural pairs of upper and lower rollers so that a U-shaped recess is formed at the central portion in the longitudinal direction of the strip material and ring-like projection at both edges of the strip material. Then, the strip material is bent into a spiral form. The spirally wound strip material is passed to a transferring means and first, second and third extruders to extrude molten resin and first, second and third pressing rollers operating in association with the repsective extruders, whereby a second synthetic resin layer is formed at the outer circumferential portion of the adjoining edges of the sprially wound strip material, a third synthetic resin layer is formed on the back side of the recess portion of the same, and a fourth synthetic resin layer is formed on the outer circumferential surface of the recess portion and the adjoining edges of the spirally wound strip material.

Abstract: A flexible hose comprises a flexible helically convoluted plastics material tube 12 wound helically with a reinforcing profile strip 14. The strip 14 is of such a cross-section as to support the tube wall and limit the maximum radius of curvature R2 at maximum flexion to a value less than that which is obtain with an equivalent standard hose FIG. 5). Preferably the profiled strip has a cross-section which is non-circular and comprises two components, one 18 being substantially axially of the tube, and the other 20 being substantially radially of the tube. The axial component provides support for the tube wall and the radial component serves to improve resistance to radial forces and limits the radius of curvature of the adjacent convolution.

Abstract: A hydraulically efficient metal pipe particularly adapted for use in storm drain and sanitary sewer applications which is adapted for use with a self-supporting interior inert protective lining. The pipe has a channeled wall defining a plurality of outwardly projecting structural ribs and a hydraulically smooth interior surface. The ribs are preferably of a helical configuration and the channels which are formed interiorly thereof are generally either square or rectangular in cross-section and are open along the interior surface of the pipe. The walls defining the ribs can be tapered inwardly to form triangular-shaped channels so as to define an anchor througout the length of the pipe for securing thereto a smooth interior lining of corrosion-resistant protective material.

Abstract: A tape for corrosion protection, in which a pressure sensitive adhesive is coated on one face of a plastic sheet, and pieces of galvanic sacrificial anode metal foil for cathodic protection are lined consecutively on a part of its adhesive face across less than the entire width of the plastic sheet. An object of this invention is to prevent corrosion by means of an effect of cathodic protection.

Abstract: To manufacture a bent prestress conduit (5) adapted to receive without damage cables (7) subjected to extremely high pulling forces, one of the faces of a metal strip (1) is coated intimately with a metal phosphate layer (4) itself covered by a soap and this metal strip is wound in helical form so as to obtain a continuous tube whose inner face is formed by the thus coated face of the metal strip.