A system for transporting corrosive or erosive fluids having a flow conduit or flow equipment with a flow bore. One or more inserts (50) are disposed within the flow bore of the flow conduit or flow equipment. The insert(s) (50) include an internal structure (52) and an erosion or corrosion resistant coating (54) disposed around the internal structure. The insert(s) (50) is/are disposed inside the flow bore and provide erosion and/or corrosion resistance.

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 of lining an inner surface of a tubular with a polymer, includes positioning a polymer injecting head within the tubular, forming an annular space between the injecting head and an inner surface of the tubular, injecting polymer through the injecting head into the annular space, and moving the polymer injecting head longitudinally relative to the tubular while injecting polymer.

The present invention provides a metal pipe coated on at least a section of the metal pipe with a polyolefin coating system, wherein the system consists of the following layers: (a) optionally, a corrosion protective layer of a chromate, phosphate or other salt; (b) a polyolefin based adhesive, preferably in a thickness of 0.3-5 mm; (c) a PE or PP coating layer, preferably in a thickness of 1-10 mm; (d) optionally, an adhesion promoting layer between the polyolefin based adhesive and a PE or PP layer; wherein the polyolefin based adhesive contains an organic phase consisting of substantially saturated hydrocarbons, and wherein the adhesive contains amorphous polypropylene, ethylene-propylene copolymers or poly(iso)butylene (co)polymers, said adhesive being flowable when a pressure of 10 kgf/cm.sup.2 is applied, wherein the PE or PP coating is a continuous layer over the coated section, and wherein said polyolefin based adhesive adheres to both the metal pipe and to said PE or PP coating.

The present invention provides a metal pipe coated on at least a section of the metal pipe with a polyolefin coating system, wherein the system consists of the following layers: (a) optionally, a corrosion protective layer of a chromate, phosphate or other salt; (b) a polyolefin based adhesive, preferably in a thickness of 0.3-5 mm; (c) a PE or PP coating layer, preferably in a thickness of 1-10 mm; (d) optionally, an adhesion promoting layer between the polyolefin based adhesive and a PE or PP layer; wherein the polyolefin based adhesive contains an organic phase consisting of substantially saturated hydrocarbons, and wherein the adhesive contains amorphous polypropylene, ethylene-propylene copolymers or poly(iso)butylene (co)polymers, said adhesive being flowable when a pressure of 10 kgf/cm.sup.2 is applied, wherein the PE or PP coating is a continuous layer over the coated section, and wherein said polyolefin based adhesive adheres to both the metal pipe and to said PE or PP coating.

The use of PEKK for lowering the CO.sub.2 and H.sub.2S permeability of a part intended to enter into contact with a petroleum effluent. Also, a pipe for transporting a petroleum effluent, including a layer intended to be in contact with the petroleum effluent, wherein the layer intended to be in contact with the petroleum effluent comprises PEKK and has a CO.sub.2 permeability at 130° C. of less than 10.sup.−8 cm.sup.3, for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of CO.sub.2 pressure and/or an H.sub.2S permeability at 130° C. of less than 10.sup.−8 cm.sup.3 for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of H.sub.2S pressure, the amount of CO.sub.2 and H.sub.2S being measured by GC, respectively. Lastly, a number of methods for manufacturing such a pipe.

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 non-metallic cabling continuous oil pipe, relating to the technical field of oil mining in oil fields, is disclosed. Said oil pipe includes an inner liner tube, the inner liner tube which is used to form a passageway for medium transportation. An outer wall of the inner liner tube is provided with a cable embedded layer and a protection sleeve in sequence, the cable embedded layer including cables and a plurality of reinforcement belts. The reinforcement belts are used to resist torsional deformation and to bear an axial tension. The protection sleeve is used to prevent the cables from being worn.

The use of PEKK for lowering the CO.sub.2 and H.sub.2S permeability of a part intended to enter into contact with a petroleum effluent. Also, a pipe for transporting a petroleum effluent, including a layer intended to be in contact with the petroleum effluent, wherein the layer intended to be in contact with the petroleum effluent comprises PEKK and has a CO.sub.2 permeability at 130 C. of less than 10.sup.8 cm.sup.3, for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of CO.sub.2 pressure and/or an H.sub.2S permeability at 130 C. of less than 10.sup.8 cm.sup.3 for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of H.sub.2S pressure, the amount of CO.sub.2 and H.sub.2S being measured by GC, respectively. Lastly, a number of methods for manufacturing such a pipe.

A non-metallic cabling continuous oil pipe, relating to the technical field of oil mining in oil fields, comprises: an inner liner tube, the inner liner tube being used to form a passageway for medium transportation; from inside to outside, an outer wall of the inner liner tube being provided with a cable embedded layer and a protection sleeve in sequence thereon, the cable embedded layer including cables and a plurality of reinforcement belts, the reinforcement belts being used to resist torsional deformation and to bear an axial tension; the protection sleeve being used to prevent the cables from being worn.