Importance

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Abstract

A method of installing a subsea tie in conduit comprises unspooling or manufacturing a steel rigid lined pipeline aboard an installation vessel and launching the pipeline progressively into water. A distal end of the tie-in conduit is coupled to a proximal end of the pipeline above the surface and is then launched into the water coupled to the pipeline. The suspended weight load of the pipeline is supported by an A&R wire connected to the proximal end of the pipeline, defining a load path that bypasses the tie-in conduit. A proximal end of the tie-in conduit may be suspended from that wire. The tie-in conduit is of composite or flexible pipe, hence being pliant relative to the lined rigid pipeline and maintaining its internal corrosion resistance. After landing on the seabed, the tie-in conduit may be deflected relative to the pipeline for connection to a subsea connection point.

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First Claim