A coated tow includes a fiber bundle composed of continuous reinforcement fibers that form a flat substrate in a ribbon shape and a thermoplastic-based overcoating applied to the flat substrate to form a uni-directional tape. An extruded tape includes a plurality of cords of twisted fiber yarns each composed of continuous reinforcement fibers, a thermoplastic overcoating applied to each of the cords, and a high density polyethylene (HDPE) that encases the plurality of cords to form a uni-directional tape. The reinforcement fibers have continuous filaments aligned lengthwise along a length each of the cords. A process of producing the coated tow or extruded tape includes feeding one or more spools of continuous fiber tow under tension control, sinking the continuous fiber tow in a chemical bath, passing the wetted continuous fiber tow through one or more squeezing rollers, and passing the continuous fiber tow through an oven.

A method protects a field joint of a pipeline, where chamfered edges of thermally-insulating parent coatings on conjoined pipe lengths are in mutual opposition about a longitudinally-extending gap. The method includes manufacturing an hourglass-shaped inner layer around the pipe lengths, which layer may be moulded. The inner layer extends longitudinally along the gap between the chamfered edges and at least partially overlies the chamfered edges. A thermally-insulating solid insert is assembled from two or more parts to lie in the gap surrounding the inner layer, and pressure is applied radially inwardly from the insert to the inner layer. An outer layer of molten material is manufactured around the insert to form a watertight barrier and to form one or more melted interfaces with the inner layer. Corresponding field joint arrangements are also disclosed.

Within examples, a method of manufacturing a double-walled titanium conduit is described. Example methods include stitch welding multiple concentric sheets to form a stitch layer, providing the stitch layer between an inner wall and an outer wall of the double-walled titanium conduit, circumferentially seam welding the inner wall and the outer wall to the stitch layer to create a welded assembly, die forming the welded assembly at temperature and pressure to form inner structures between the multiple concentric sheets according to stitch welding lines and to enable a diffusion bond process among the inner wall, the stitch layer, and the outer wall, and removing the double-walled titanium conduit from the die.

Within examples, a method of manufacturing a double-walled titanium conduit is described. Example methods include stitch welding multiple concentric sheets to form a stitch layer, providing the stitch layer between an inner wall and an outer wall of the double-walled titanium conduit, circumferentially seam welding the inner wall and the outer wall to the stitch layer to create a welded assembly, die forming the welded assembly at temperature and pressure to form inner structures between the multiple concentric sheets according to stitch welding lines and to enable a diffusion bond process among the inner wall, the stitch layer, and the outer wall, and removing the double-walled titanium conduit from the die.

A carbon fiber reinforcement for reinforcing a pipe connection between two pipes includes a carbon fiber composite having a substantially circular cross-section, a length, a central axis along the length, an outer surface, and an inner surface, wherein the outer surface of the reinforcement is configured to bond with an inner surface of one of the two pipes. A method for reinforcing a pipe connection between two pipes includes forming a carbon fiber composite reinforcement having a substantially circular cross-section, a length, a central axis along the length, an outer surface, and an inner surface, and bonding the outer surface of the reinforcement to an inner surface of one of the two pipes.

The present general inventive concept, in some of its many example embodiments, relates to a line, in particular for the conduction of gaseous media under high pressure, preferably in the range of 150 bar to 400 bar, very preferably in the range of 200 bar to 350 bar, in particular 200 bar to 250 bar, having at least one high-pressure line and at least one gas recirculation line, characterized in that the gas recirculation line is arranged, preferably coaxially, inside the high-pressure line and the gas recirculation line comprises a stabilization device, in particular in spiral form, preferably a steel spiral, very preferably a normal steel spiral or a stainless steel spiral.

A method of manufacturing a reinforced pipe (7) comprising: wrapping a pipe (1) in reinforcing tape (2) to form a wrapped pipe having an outer circumference consisting of a first circumferential portion (4) and a second circumferential portion (6); and passing the first circumferential portion (4) over one or more heating elements (3) to fuse the reinforcing tape (2) of said first circumferential portion (4); wherein: the first circumferential portion (4) is between 1% and 50% of the outer circumference; and the second circumferential portion (6) is not passed over a heating element (3) and is not fused. The method is advantageous in that it can provide reinforced pipes (7) in a simpler and cheaper way because it is not essential that the entirety of the outer circumference of the reinforced pipe (7) is fused. A reinforced pipe (7) produced according to the method of the present invention is also provided.

The present disclosure concerns a pipe structure for high-pressure applications. To provide a pipe structure which overcomes at least one of the disadvantages of the pipes known from the state of the art, it is proposed according to the disclosure that the pipe structure has an inner pipe comprising a metal, wherein the inner pipe has an inner surface and an outer surface, at least one strand which surrounds the outer surface of the inner pipe and has a plurality of yarns, wherein at least one of the yarns has carbon fibres, and a protective pipe surrounding the strand and the inner pipe.

The present disclosure concerns a pipe structure for high-pressure applications. To provide a pipe structure which overcomes at least one of the disadvantages of the pipes known from the state of the art, it is proposed according to the disclosure that the pipe structure has an inner pipe comprising a metal, wherein the inner pipe has an inner surface and an outer surface, at least one strand which surrounds the outer surface of the inner pipe and has a plurality of yarns, wherein at least one of the yarns has carbon fibres, and a protective pipe surrounding the strand and the inner pipe.

Methods and manufactures disclosed herein generally relate to a tubular composite (TCS) structure composed of multiple layers of sealing, reinforcement, sensing, protection and interspatial injected materials.