Ultra-Deepwater Installation

Collapse + bend resistance

The Industry Challenge:

The most critical loading condition for deepwater pipelines occurs during installation. As the pipe is assembled and lowered to the sea floor, bending occurs as the pipe transitions from hanging from the lay vessel to laying on the sea floor.

The bending causes the pipe to ovalize slightly, reducing its resistance to collapse.

The magnitude of reduction in collapse resistance is a complex combination of material properties and pipe geometry that is difficult to calculate; therefore, full-scale testing is required to verify that the supplied pipe meets the collapse design requirements.

How We Help:

C-FER tests rigid and flexible pipe products under simulated deep water conditions, including the combination of collapse plus mechanical loading causing bending or torsion to represent installation and operating scenarios.

These tests are used to qualify pipe from different pipe mills for specific pipeline projects. Furthermore, these tests have investigated the effects of heat treating on the collapse resistance of thick wall pipe.

New ring collapse methods have also been developed to measure the collapse resistance of large diameter, thick‑walled pipes that can be used as part of quality control processes in the pipe mill.

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