Subsea 7 Limited

H. Butting Gmbh & Co. Kg

H. Butting Gmbh

Thomas Schüller

John Arthur Mair

Friedrich Henneicke

Gernold Holler

Joachim Banse

The application relates to a method for producing a double-walled pipe () and a pipe () of this type, having an outer pipe () which is press-fitted with an inner pipe () consisting of a corrosion-resistant alloy, wherein an adhesive () is inserted at least in regions between the outer pipe () and the inner pipe (), wherein, after adhering the inner pipe () with the outer pipe (), the inner pipe () and the adhesive layer () are removed at the pipe ends, and the inner side of the outer pipe () is plated via an integral connection with the inner pipe ().

Method for producing a double-walled pipe and a double-walled pipe

The application relates to a method for producing a double-walled pipe () and a pipe () of this type, hating an outer pipe () which is press-fitted with an inner pipe () consisting of a corrosion-resistant alloy, wherein an adhesive () is inserted at least in regions between the outer pipe () and the inner pipe (), wherein, after adhering the inner pipe () with the outer pipe (), the inner pipe () and the adhesive layer () are removed at the pipe ends, and the inner side of the outer pipe () is plated via an integral connection with the inner pipe ().

A method is disclosed for reeling or unreeling a pipeline having an inner corrosion-resistant metallic liner that is tightly fitted within the pipeline. To minimize or avoid wrinkling of the liner during the reeling or unreeling, a length of the pipeline is internally pressurized in a two-stage pressurizing process, and then the length of pipeline is reeled or unreeled, as the case may be. In the first stage of the pressurizing process, the length of the pipeline is filled with fluid at an elevated pressure, and in the second stage the fluid pressure is raised to a higher pressure, which may be 25 bars or more, absolute.

Method of reeling and unreeling an internally clad metal pipeline

A method is disclosed for reeling a pipeline having an inner corrosion-resistant metallic liner that is tightly fitted within the pipeline. To minimize or avoid wrinkling of the liner during the reeling or unreeling, a length of the pipeline is internally pressurized by deploying a single sealing pig within the pipeline near to the trailing end of the pipeline and applying pressurized fluid within the pipeline, and then the length of pipeline is reeled onto a storage reel. In the pressurizing process, the length of the pipeline is filled with fluid at an elevated pressure within a range defined by a lower limit of 5 bar.

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Hankensbüttel, Germany

Thomas Schüller