A flexible conduit used for transportation of hydrocarbon fluids for off-shore and on-shore oil and gas applications includes an inner pressure sheath, at least one reinforcing layer at least partially disposed around the pressure sheath, an outer protective sheath at least partially disposed around the at least one reinforcing layer, and optionally a thermally insulating layer disposed between the at least one reinforcing layer and the outer protective sheath. At least one of the inner pressure sheath, outer protective sheath, and the thermally insulating layer is manufactured using a thermoplastic blend (TPB) composition. The TPB compositions disclosed herein are useful for the formation of at least one polymer layer of the thermoplastic umbilical hoses used for transportation of hydrocarbon fluids.

A piping insulation insert that may be inserted in a cut-away portion of insulation wrapping a pipe, wherein the piping insulation insert supports the weight of the pipe against a system by which the insulated pipe is suspended and supported. The insert includes: a length of unistrut having a u-shaped cross-sectional profile, wherein: the exterior surface of the u-shaped unistrut is covered with a first insulating material; a volume defined by the interior surface and the two upper edges of the u-shaped unistrut is packed with a second insulating material; and the two upper edges of the u-shaped unistrut are covered with the first insulating material.

A hybrid composite tube includes a metallic tube, a first silica fiber layer positioned radially of the metallic tube, a fiber reinforced polymer layer positioned radially of the first silica fiber layer, and a second silica fiber layer positioned radially of the fiber reinforced polymer layer, wherein the first silica fiber layer thermally insulates the fiber reinforced polymer layer and the second silica fiber layer thermally insulates the fiber reinforced polymer layer.

One aspect of the invention provides a composite refrigeration line set including: a suction line and a return line. One or more of the suction line and the return line are a composite refrigeration line set tube including: an inner plastic tube; a first adhesive layer circumferentially surrounding the inner plastic tube; an aluminum layer circumferentially surrounding the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer circumferentially surrounding the aluminum layer; and an outer plastic layer circumferentially surrounding the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene of raised temperature. The outer plastic tube is polyethylene of raised temperature. The aluminum layer includes an alloy selected from the group consisting of: AL 3004-O, AL 3005-O, and AL 3555-O. The aluminum layer is butt-welded to itself.

One aspect of the invention provides a composite refrigeration line set including: a suction line and a return line. One or more of the suction line and the return line are a composite refrigeration line set tube including: an inner plastic tube; a first adhesive layer circumferentially surrounding the inner plastic tube; an aluminum layer circumferentially surrounding the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer circumferentially surrounding the aluminum layer; and an outer plastic layer circumferentially surrounding the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene of raised temperature. The outer plastic tube is polyethylene of raised temperature. The aluminum layer includes an alloy selected from the group consisting of: AL 3004-O, AL 3005-O, and AL 3555-O. The aluminum layer is butt-welded to itself

A method of joining together liner sections within a polymer-lined pipe energises an induction coil inside the pipe to spot-heat part of a circumferential interface between the liner sections. This melts and fuses the polymer material locally. The induction coil is then moved along the interface to heat other parts of the interface successively above the melting temperature. An apparatus for performing the method has a power supply for energising the induction coil and a drive system for moving the energised induction coil relative to a body of the apparatus. The apparatus may be configured as a carriage that is movable along the pipe.

A method for producing a pre-insulated pipe, comprising inserting a length of jacket pipe (10) into a guide channel (110) having a front end (111) and a rear end (112); fixing said length of jacket pipe (10) in said guide channel (110); providing a first end (21) of a length of insulated inner piping (20), said length of insulated inner piping comprising a length of inner pipe surrounded by at least one layer of compressible insulation material (26); inserting, at said front end of said guide channel, into said length of jacket pipe, said first end of said length of insulated inner piping (20); applying an overpressure at least in an interior of said length of jacket pipe (10), around the inserted first end of the length of insulated inner piping (20); and moving said first end of said length of insulated inner piping (20) to said rear end of said guide channel (110); wherein said overpressure is such that said at least one layer of insulation material (26) is radially compressed; removing said overpressure to fix said length of insulated inner piping (20) in said length of jacket pipe (10) in order to form a pre-insulated pipe.

A super-long thermal insulation steel jacket pipe and a machining process for making such a pipe are provided. The pipe is designed to exhibit good thermal insulation performance and corrosion resistance. An annular cavity of the pipe is in a vacuum state, and the pipe is internally provided with a support frame and filled with a phase change material. When the pipe is used for underground energy exploitation, temperature in a working steel pipe in the pipe can be effectively kept unaffected when external temperature decreases. The steel jacket pipe has long service life, and can greatly reduce costs of exploitation of petroleum and/or of an underground heat source, such as by reducing a heat loss in exploitation.

A double wall coaxial piping system with enhanced strength designed to transport a medium underground and minimize leaks is provided. The double wall coaxial piping system includes a plurality of pipe assemblies connected together to form a constructed pipe assembly with a first end and a second end. Each pipe assembly has an outer pipe and an inner pipe secured within the outer pipe. The inner pipe of each pipe assembly is continuously connected to the inner pipe of an adjacent pipe assembly in the plurality of pipe assemblies. Each end in the first and second ends of the constructed pipe assembly has a pair of plates coupled to the outer pipe of the pipe assembly at the end of the constructed pipe assembly and a packing layer disposed between the pair of plates.

One aspect of the invention provides a composite refrigeration line set including at least one selected from the group consisting of: a suction line and a return line, characterized in that one or more of the suction line and the return line are a composite refrigeration line set tube include: an inner plastic tube; a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer; and an outer plastic layer positioned about the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene of raised temperature. The outer plastic tube is polyethylene of raised temperature. The aluminum layer comprises AL 3005-O.