Manufacturing considerations for high-thickness, small-diameter deepwater linepipe ///

Deepwater linepipe is usually small-diameter, thick-walled pipe, which is by definition a pipe with a high thickness-to-diameter (t/D) ratio. For pipe manufacturers who deploy the UOE process, in which steel plate is first pressed into a U, and then an O shape, then expanded circumferentially, the creation of linepipe with a high t/D ratio represents the greatest challenge. As the limit state for the design of such pipe is not guaranteed to be collapse, the manufacturer has to produce a high t/D linepipe that can meet the most demanding limit-state requirements, with any specific collapse element coming through extra testing.

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