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Insulated-pipe

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Insulated pipe

Details

Inventors: Persson, Sture; Hoel, Lars;
Assignee: Skega AB (Ersmark, SE)
Primary Examiner: Robinson; Ellis P.
Assistant Examiner: Siedleck; James J.
Attorney, Agent or Firm: Cushman, Darby & Cushman

Insulated pipe especially but not exclusively intended for subsea pipelines for transport of oil, gas and similar products which pipe comprises a steel pipe as core, a layer of corrosion protection material, a layer of thermally insulating material surrounding this and an external protective layer surrounding the insulating layer. To improve such insulated pipes so that they are capable of resisting occurring stresses even when placed under water at great depths the three layers contain rubber, the lyaer further containing cork up to 30-70% by volume.

DETAILED DESCRIPTION It is therefore the object of this invention to provide an insulated pipe meeting the above-mentioned demands made on pipelines to be placed under water at great depths and which, moreover, is jointed in such a way that the joint between two pipes according to the invention does not deviate from the rest of the pipe.
This is achieved in part in that three rubber layers are provided around the pipe, the middle one also containing cork.

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