Abstract: Disclosed herein is a method for producing insulated pipes having an improved protection of the insulation material. The pipe system comprises an inner pipe with a longitudinal axis extending from a first end of the inner pipe to a second end of the inner pipe, the inner pipe comprising a middle section, a first end section at the first end of the inner pipe, and a second end section at the second end of the inner pipe, a layer of inner coating covering the inner pipe, the layer of inner coating comprising one or more inner coating sub layers, one or more layers of insulation material covering the layer of inner coating such that the insulation layer covers the middle section of the inner pipe covered by the inner coating, and the ends of the insulation layer tapers towards the end sections, and the end sections comprises a section with an exposed layer of inner coating.

Abstract: A method for producing an insulated pipe in corrugated casing (100) comprising the steps of: covering an inner pipe assembly (105) comprising at least one inner pipe (101) with a film (106); dispensing an expandable insulation material (102) in a liquid state between the inner pipe assembly (105) and the film (106) thereby preparing an initial pipe assembly (107) comprising a layer of expanding insulation material (102a) positioned between the film (106) and the inner pipe assembly (105); extruding a layer of outer casing (104) onto the initial pipe assembly (105) before the insulation material has expanded completely, thereby creating a still expanding insulated pipe assembly (118); and leading the still expanding insulated pipe assembly (118) through a corrugator (205) having an inner corrugated surface giving the casing (104) a corrugated shape as the at least one layer of expanding insulation material (118) continues to expand.

Abstract: The present invention relates to a method for manufacturing an insulated pipe comprising an inner pipe, an insulation material and a casing. The manufacturing method of the present invention concerns in particular the process of molding an insulation material onto the inner pipe, comprising the step of covering the inner pipe with a closed bag with open ends and subsequently inserting the bag covered inner pipe into a mold. Hereafter the insulation material is injected in a liquid state into the mold between the inner pipe and the bag. The insulation material in a liquid state will after injection start to expand and finally solidify. During those processes, the bag is pressed towards the inner wall of the mold.

Abstract: This invention relates to a pipeline assembly especially for offshore installation comprising an inner carrier pipe, a casing and at least one closed-cell and/or solid thermal insulation material layer placed in between the casing and the inner carrier pipe, and the at least one insulation layer being directly or indirectly bonded to at least the casing and the inner carrier pipe. The pipeline assembly has improved bending properties which is achieved as the insulation material layer comprises at least one slit substantially transversely to the longitudinal direction of the pipeline assembly. The slit can be applied as a helical or circumferential cut, enabling the pipeline assembly to be rolled onto a reel or spool which greatly improves the pipeline assembly installation process. Methods of improving the bending properties of such a pipeline assembly are also described.

Abstract: The present invention relates to a method for manufacturing an insulated pipe comprising an inner pipe, an insulation material and a casing. The manufacturing method of the present invention concerns in particular the process of moulding an insulation material onto the inner pipe, comprising the step of covering the inner pipe with a closed bag with open ends and subsequently inserting the bag covered inner pipe into a mould. Hereafter the insulation material is injected in a liquid state into the mould between the inner pipe and the bag. The insulation material in a liquid state will after injection start to expand and finally solidify. During those processes, the bag is pressed towards the inner wall of the mould.

Abstract: This invention relates to a shrink sleeve (300) for joining the casing of two insulated pipes lying end-to-end, where the shrink sleeve (300) has a tubular shape comprising a first polymer-based material (320) susceptible to irradiation. The tubular shape of the shrink sleeve (300) consists of the first polymer-based material (320) and a second polymer-based material (322), where the second polymer-based material (322) is resistant to the irradiation. Further, the second polymer-based material (322) can be weldable.

Abstract: Disclosed herein is a pipe for transporting fluids such as oil or gas, said pipe comprising an inner carrier pipe, with an inner coating and a casing characterised in that said inner coating and said casing are sealed by integration between the material of the inner coating and the material of the casing as a result of a change of the molecular state of the materials in the area which is to be integrated. Hereby a strong sealing between the casing and the inner coating is obtained, which allows for an effective encapsulation of e.g. insulation material placed in between the casing and the inner coating. The invention further relates to a method for sealing an inner coating and a casing in a pipe for transporting fluids such as oil or gas.

Abstract: This invention relates to a pipeline assembly especially for offshore installation comprising an inner carrier pipe, a casing and at least one closed-cell and/or solid thermal insulation material layer placed in between the casing and the inner carrier pipe, and the at least one insulation layer being directly or indirectly bonded to at least the casing and the inner carrier pipe. The pipeline assembly has improved bending properties which is achieved as the insulation material layer comprises at least one slit substantially transversely to the longitudinal direction of the pipeline assembly. The slit can be applied as a helical or circumferential cut, enabling the pipeline assembly to be rolled onto a reel or spool which greatly improves the pipeline assembly installation process. Methods of improving the bending properties of such a pipeline assembly are also described.