The invention relates to a method of manufacturing a pipe segment for a link tube between the sea floor and a petroleum drilling rig disposed on the sea surface, wherein it consists in: providing a transport pipe segment that is resistant to open-sea conditions; disposing a female bayonet-piece around one reinforced end of the transport pipe segment; welding or otherwise bonding a narrower portion of the bayonet-piece to said reinforced end; disposing an insulator around the transport pipe segment and around the bayonet-piece; inserting the transport pipe segment into an outer wall segment; welding or otherwise bonding a narrower portion of the outer wall segment to the other reinforced end of the transport pipe segment; disposing a cover-piece around the bayonet-piece; welding or otherwise bonding the cover-piece to the outer wall segment and to the bayonet-piece; it being possible to apply tightening torque to the outer wall segment and to transmit it to the transport pipe segment.

The invention relates to a method of manufacturing a pipe segment for a link tube between the sea floor and a petroleum drilling rig disposed on the sea surface, wherein it consists in: providing a transport pipe segment that is resistant to open-sea conditions; disposing a female bayonet-piece around one reinforced end of the transport pipe segment; welding or otherwise bonding a narrower portion of the bayonet-piece to said reinforced end; disposing an insulator around the transport pipe segment and around the bayonet-piece; inserting the transport pipe segment into an outer wall segment; welding or otherwise bonding a narrower portion of the outer wall segment to the other reinforced end of the transport pipe segment; disposing a cover-piece around the bayonet-piece; welding or otherwise bonding the cover-piece to the outer wall segment and to the bayonet-piece; it being possible to apply tightening torque to the outer wall segment and to transmit it to the transport pipe segment.

A thermoplastics injection molding process coats a field joint of a pipeline by positioning a mold tool around the field joint to define a mold cavity. Thermoplastics material injected into the mold cavity forms a field joint coating that will set in the mold cavity. As the thermoplastics material shrinks in the mold cavity while the field joint coating sets, compacting pressure is applied radially inwardly within the mold cavity against a radially outer side of the field joint coating. A compacting fluid introduced into the mold cavity between the mold tool and the field joint coating may be used to apply pressure against the field joint coating. This accelerates and controls cooling of the field joint coating while maximizing quality.

A thermoplastics injection molding process coats a field joint of a pipeline by positioning a mold tool around the field joint to define a mold cavity. Thermoplastics material injected into the mold cavity forms a field joint coating that will set in the mold cavity. As the thermoplastics material shrinks in the mold cavity while the field joint coating sets, compacting pressure is applied radially inwardly within the mold cavity against a radially outer side of the field joint coating. A compacting fluid introduced into the mold cavity between the mold tool and the field joint coating may be used to apply pressure against the field joint coating. This accelerates and controls cooling of the field joint coating while maximizing quality.

The invention relates to pipe heat insulation and to methods of heat insulation installation on weld joints of pipes for transportation of oil and oil products. The heat insulation of pipe weld joints for subsurface pipelining mounting includes an anticorrosive protection of welded pipe joints using heat-shrinkable polymeric tape, heat insulating polyurethane foam pipe coverings mounted on the junction, that are held together with a tie strap locks, hot-melt adhesive tape glued at the edges of the pipe protective envelope with overlap on the pipe coverings of polyurethane foam and protective galvanized metal casing installed symmetrically relative to the center of the weld joint, the surface of which is sealed with a heat-shrinkable polymeric fabric.

The invention relates to pipe heat insulation and to methods of heat insulation installation on weld joints of pipes for transportation of oil and oil products. The heat insulation of pipe weld joints for subsurface pipelining mounting includes an anticorrosive protection of welded pipe joints using heat-shrinkable polymeric tape, heat insulating polyurethane foam pipe coverings mounted on the junction, that are held together with a tie strap locks, hot-melt adhesive tape glued at the edges of the pipe protective envelope with overlap on the pipe coverings of polyurethane foam and protective galvanized metal casing installed symmetrically relative to the center of the weld joint, the surface of which is sealed with a heat-shrinkable polymeric fabric.

A system for coating a field joint of a pipeline places at least one body having a thermoplastics material around the field joint. The body is heated in a mould cavity around the field joint to effect thermal expansion of the thermoplastics material. Thermal expansion of the body in the mould cavity is constrained to apply elevated pressure between the body and pipe sections joined at the field joint. The elevated pressure improves bonding and fusing between the body, which forms a field joint coating, and the parent coatings and the exposed pipe sections of the pipe joints. The body need not be fully molten, which reduces the mould residence time including in-mould heating and cooling phases.

A system for coating a field joint of a pipeline places at least one body having a thermoplastics material around the field joint. The body is heated in a mould cavity around the field joint to effect thermal expansion of the thermoplastics material. Thermal expansion of the body in the mould cavity is constrained to apply elevated pressure between the body and pipe sections joined at the field joint. The elevated pressure improves bonding and fusing between the body, which forms a field joint coating, and the parent coatings and the exposed pipe sections of the pipe joints. The body need not be fully molten, which reduces the mould residence time including in-mould heating and cooling phases.

A securing device includes at least one rigid ring configured to encircle the pipe, and at least one securing system, rigid and distinct from the ring, including a body which has a first contact face configured to be pressed firmly against and secured to a surface of a structure, and at least one groove in which the ring is housed, the groove being configured to allow the securing system to slide with respect to the ring in a direction of sliding along the ring, while being immobile or near-immobile relative to the ring in a plane perpendicular to the direction of sliding.

A device for securing at least one insulating tube on a duct, includes an inner ring configured to be mounted on the duct, an outer ring coaxial to the inner ring, and a transverse web linking the inner and outer rings, the inner and outer rings and the transverse web forming two recesses, arranged on either side of the transverse web, each configured to receive an end of an insulating tube.