A pipe for transporting gas, notably carbon dioxide, includes at least one tubular element, tubular element consisting of a juxtaposition of concentric layers including, from inside to outside, at least one sealing layer, a wall including a prestressed concrete layer and at least one circumferential mechanical reinforcement layer. Furthermore, the concrete making up prestressed concrete layer is selected from among the ultra-high performance fibre-reinforced concretes (UHPFRC).

A pipe for transporting gas, notably carbon dioxide, includes at least one tubular element, tubular element consisting of a juxtaposition of concentric layers including, from inside to outside, at least one sealing layer, a wall including a prestressed concrete layer and at least one circumferential mechanical reinforcement layer. Furthermore, the concrete making up prestressed concrete layer is selected from among the ultra-high performance fibre-reinforced concretes (UHPFRC).

A carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline belongs to the technical field of marine structure engineering. The composite submarine pipeline is formed by connecting several composite sub-pipelines arranged sequentially along an axial direction of the pipeline, each composite sub-pipeline has an identical structure and includes an outer carbon steel pipe and an inner stainless steel pipe each having a circular cross section and concentrically placed, concrete or cement mortar is filled between the outer carbon steel pipe and the inner stainless steel pipe to form a sandwiched structure with a circular ring-shaped cross section. Between two adjacent composite sub-pipelines, the welding line of the inner stainless steel pipelines is covered by the concrete/cement mortar, and the fatigue performance of the inner stainless steel pipes at the welding line can be improved effectively.

A carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline belongs to the technical field of marine structure engineering. The composite submarine pipeline is formed by connecting several composite sub-pipelines arranged sequentially along an axial direction of the pipeline, each composite sub-pipeline has an identical structure and includes an outer carbon steel pipe and an inner stainless steel pipe each having a circular cross section and concentrically placed, concrete or cement mortar is filled between the outer carbon steel pipe and the inner stainless steel pipe to form a sandwiched structure with a circular ring-shaped cross section. Between two adjacent composite sub-pipelines, the welding line of the inner stainless steel pipelines is covered by the concrete/cement mortar, and the fatigue performance of the inner stainless steel pipes at the welding line can be improved effectively.

A method of cutting and removing a section of prestressed concrete cylinder pipe and then installing a replacement valve while the pipeline is fully pressurized uses a replacement valve body with two cylinders that match the openings of the cut pipe. Inside each of the two cylinders is a cut-covering assembly which includes a cylindrical elastomeric seal and a mechanical linkage to move the seal in and out of the cut pipe. The replacement valve body further includes a rotatable valve in a central portion of the valve, and when the cylinder ends of the replacement valve body are positioned adjacent the bores of cut pipe ends, the valve can be rotated to move linkage assemblies that control the elastomeric seals in and out of each of the cut-covering assemblies into the bores of the cut pipe ends, thereby covering gaps created when the pipe was cut and placing the pipe ends in fluid-tight engagement with the replacement valve body.

An integrated jacking pipe comprising a concrete jacking envelope integrally-formed with and encircling a metal pipe, wherein said metal pipe comprises a spigot protruding from said concrete jacking envelope and a bell whose diameter is larger than a diameter of said spigot.

An integrated jacking pipe comprising a concrete jacking envelope integrally-formed with and encircling a metal pipe, wherein said metal pipe comprises a spigot protruding from said concrete jacking envelope and a bell whose diameter is larger than a diameter of said spigot.

The invention relates to corrosion-protected ductile cast iron pipes, a method for producing corrosion-protected ductile cast iron pipes, and the use of specific compositions for producing corrosion-protected ductile cast iron pipes. More particularly, the invention relates to corrosion protection for ductile cast iron pipes using latex-modified cement mortars based on calcium-aluminum cements.

The invention relates to corrosion-protected ductile cast iron pipes, a method for producing corrosion-protected ductile cast iron pipes, and the use of specific compositions for producing corrosion-protected ductile cast iron pipes. More particularly, the invention relates to corrosion protection for ductile cast iron pipes using latex-modified cement mortars based on calcium-aluminum cements.

A method for coating a pipe involves applying a coating material of cellular structured extruded thermoplastic material to the pipe and enclosing it on the outside by an outer covering layer of compact plastic. In an extrusion head, the annular opening for supplying coating material can be adjusted to a desired temperature by a region having coolant channels separated from the annular opening by an annular heat exchange surface. Before being applied to the pipe, the flowable coating material is guided along the heat exchange surface and cooled to a temperature just above the solidification temperature thereof. After the coating material leaves the annular opening, the coating material expands in a controlled manner, widening the outer covering layer depending on the adjusted temperature of the coating material, until the coating material begins to solidify. The outer covering layer surface condition can correspond to or be different from the pipe.