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AssigneeAker Kvaerner Subsea AS
InventorsBjorn Paulshus, Tor-Oystein Carlsen, Turid Storhaug, John Magne Johnsen
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A composite pipe having at least one metal end piece (2, 3) with a free end and a non-metal tubular component (10). The tubular component (10) is coupled to the at least one end piece (2, 3) opposite of the free end of the end piece (2, 3), by means of at least one peripherally extending, axially acting groove (6, 7) that the non-metallic tubular component (10) engages. The non-metallic tubular component (10) generally comprises axial fibers (11) extending down into the at least one groove (6, 7). The groove (6, 7) has a bottom (13) and a flank (14), which flank is located furthest away from the free end of the end piece (2, 3). Between the flank (14) and the axial fibers (11) there is provided an intermediate layer (15). Also described is a method of manufacturing such a composite pipe.
A composite pipe having at least one metal end piece with a free end and a groove indented into its outer surface and a non-metallic tubular component, wherein the non-metallic tubular component is coupled to the at least one end piece opposite of the free end of the end piece, at the groove which the non-metallic tubular component engages, the non-metallic tubular component comprising generally axial directed fibres extending down into the at least one groove, which groove has a bottom and a flank, and which flank is located furthest away from the free end of the end piece, characterized in that an intermediate layer of material is provided between the flank and the axial fibres, having a thickness that separates the axial fibres from substantially the entire length of the flank and from less than the entire bottom of the groove, and by an amount that changes stress concentration areas in a pipe subjected to axial tension and increases axial rupture strength of the pipe, wherein, when the pipe is placed under tension, the intermediate layer is subject to higher stress concentrations than the axial fibers.
A method of manufacturing a composite pipe having at least one metal end piece with a free end and a groove indented into its outer surface and a non-metallic tubular component, where the non-metallic tubular component is coupled to the at least one end piece opposite the free end of the end piece, at the groove that the non-metallic tubular component engages, which groove has a bottom and a flank, and which flank is located furthest away from the free end of the end piece, comprising:
Dependencies are inferred from the claim text.