The invention relates to a modification process for modifying a biaxially oriented pipe, comprising a) providing a biaxially oriented pipe made by stretching a tube made of a thermoplastic polymer composition in the axial direction and in the peripheral direction, b) placing an insert within an end portion of the pipe, wherein the outer periphery of the cross section of the insert substantially matches the inner periphery of the cross section of the pipe and c) heating the end portion such that the end portion axially shrinks while the inner periphery of the cross section of the end portion is substantially maintained, to obtain a modified biaxially oriented pipe with a thickened end portion

A pipe-joining method for building a hydrocarbon pipeline, in particular an underwater pipeline, includes welding two adjacent pipes to form a cutback, and forming a protective coating about the cutback. Forming the protective coating includes applying an LE (liquid epoxy) resin or a powdered FBE (fusion bonded epoxy) resin to the cutback to form a primer coat; and applying a powdered polypropylene adhesive on top of the still-wet primer coat to form an auxiliary adhesive coat. Forming the protective coating also includes fitting a polypropylene heat-shrink sleeve around the auxiliary adhesive coat; and heating the sleeve to shrink and bond the sleeve to the auxiliary adhesive coat.

A pipe-joining method for building a hydrocarbon pipeline, in particular an underwater pipeline, includes welding two adjacent pipes to form a cutback, and forming a protective coating about the cutback. Forming the protective coating includes applying an LE (liquid epoxy) resin or a powdered FBE (fusion bonded epoxy) resin to the cutback to form a primer coat; and applying a powdered polypropylene adhesive on top of the still-wet primer coat to form an auxiliary adhesive coat. Forming the protective coating also includes fitting a polypropylene heat-shrink sleeve around the auxiliary adhesive coat; and heating the sleeve to shrink and bond the sleeve to the auxiliary adhesive coat.

The present invention relates to mechanical joining of Nickel Titanium tubes, also known as Nitinol, to other tubular components. Such mechanical joining may be achieved by interpenetration of lobe features between the respective tubes by translating the tubes together on a longitudinal axis, a transverse axis, by a combination of translation and rotational motion or by a hinging motion, or by use of the shape-memory effect. The Nitinol superelasticity is used to accommodate the lobe deformation required for assembly and to snap the lobe back into its original shape to complete the mechanical joint.

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.

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.

In an aspect, a biaxially oriented pipe has a thickened end portion. The end portion has the same inner diameter as the biaxially oriented pipe and has a larger thickness than the biaxially oriented pipe. The end portion is made of the same thermoplastic polymer composition as the biaxially oriented pipe.

A flange connection has two flanges and a weld ring gasket arranged between the flanges, wherein the weld ring gasket has two weld ring halves arranged one on top of the other, each having a base section and a lip arranged on it, wherein the weld ring halves are welded to the base section by way of a fillet weld with the flange that lies against it, and wherein the lips form a torus-shaped connection section having a hollow interior, and the weld ring halves are welded to one another at the torus-shaped connection section, by way of a caulking seam. The torus-shaped connection section is arranged to lie radially on the inside.

Methods and apparatuses for additively manufactured tubular passages, additively manufactured manifolds, and additively manufactured heaters are provided.

The present patent application corresponds to an easy-to-manufacture device which eliminates all possible internal corrosion in the areas of welded joints of carbon steel pipes because it prevents damage to the inner coating during the welding process, increasing its useful live importantly.

The device consists of two parts that are welded in the workshop to the ends of each pipe. These parts have the same external diameter where the welded joint is done during the construction of the pipeline. The heat released in this process is dissipated by the device which prevents the temperature of the pipe wall from exceeding 120+/20 C., a condition that can withstand all types of coatings with paints designed for fluid pipelines.