Subsea Conductor Bend Restrictor for Stress Reduction
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Solution Overview
Problem
Subsea conductors experience undesirable bending stresses due to environmental loads like winds, waves, and currents, leading to potential fatigue and weakening over time, as they pivot between their secured upper and lower ends.
Innovation Solution
A bend restrictor system comprising a cylindrical sleeve with a lower end embedded in the sea bed and an upper end above the sea floor, radially spaced around the conductor to distribute and reduce bending stresses, with adjustable geometry and material composition to optimize stiffness and minimize stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conductor is allowed to pivot freely between secured ends, then the platform can move with environmental loads, but the conductor experiences undesirable bending stresses that fatigue and weaken it over time
Solution Approach 1:
A bend restrictor device is introduced as an intermediary component between the conductor and the environment. This device allows controlled movement while restricting harmful bending, acting as a mediator that permits necessary platform motion while protecting the conductor from excessive stresses that would lead to fatigue and failure
2Reliability
If a bend restrictor is added to the system, then conductor bending is restricted and durability is improved, but the device complexity increases
Solution Approach 1:
The bend restrictor employs a flexible sleeve or shell that surrounds the conductor. This flexible structure provides bending restriction through its geometric configuration and material properties while maintaining a relatively simple, single-component design that does not require complex mechanisms or multiple parts
Data Source
AI summary
An offshore system for drilling or production includes a buoyant hull. In addition, the offshore system includes a topside mounted to the hull and positioned above the surface of the water. Further, the offshore system includes a conductor having a lower end disposed in the sea bed below the sea floor and an upper end coupled to the topside. Still further, the offshore system includes a bend restrictor disposed about the conductor. The bend restrictor has a lower end positioned in the sea bed below the sea floor and an upper end positioned above the sea floor.