Offshore Riser Coupling with Integrated Curved Deviating Surface
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Solution Overview
Problem
Current off-shore riser fixation methods require a high number of diver-dependent submarine operations, which are hazardous, time-consuming, and costly, especially due to the need for complex cable redirection systems and poor alignment during riser insertion into I-tubes, leading to operational delays and safety risks.
Innovation Solution
A system featuring a tubular coupling recipient with a curved deviating surface for improved alignment and reduced need for external redirecting sheaves, combined with a flexible tubular pull-resistant duct for petroleum product conveyance, allowing for streamlined and safer riser connection processes with reduced diver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cable redirection systems and external redirecting sheaves are used, then cable alignment during riser insertion can be achieved, but the system complexity, cost, and number of diver operations increase significantly
Solution Approach 1:
The patent combines the cable redirection function directly into the I-tube structure by integrating a curved deviating surface within the tube itself. This merging of functions eliminates the need for separate external redirecting sheaves and complex cable redirection systems, thereby reducing device complexity while maintaining alignment precision during riser insertion.
Solution Approach 2:
The curved deviating surface acts as an intermediary element that guides and redirects the pulling cable along a predetermined path. Instead of requiring complex external redirection mechanisms, this integrated surface mediates the cable's path from the deck level down to the riser connection point, simplifying the overall system while ensuring proper alignment.
2Manufacturing precision
If multiple external redirecting sheaves and complex cable redirection systems are installed, then cable alignment is improved, but installation time, cost, and operational delays increase
Solution Approach 1:
By merging the cable redirection function into the I-tube structure itself through the integrated curved deviating surface, the patent eliminates the need for multiple separate external sheaves that would require time-consuming installation. This integration streamlines the installation process, reducing both time and cost while maintaining alignment precision.
Solution Approach 2:
The curved deviating surface is pre-integrated into the I-tube structure during manufacturing, rather than being installed as separate components during field operations. This preliminary action of incorporating the redirection function into the base structure eliminates the need for complex on-site assembly of multiple sheaves, thereby accelerating installation speed and reducing operational delays.
3Stability of the object's composition
If traditional fixation methods with multiple external components are used, then structural stability is achieved, but the number of diver operations and safety risks increase
Solution Approach 1:
The patent merges multiple functions (cable redirection, structural support, and alignment guidance) into the single integrated I-tube structure with its built-in curved deviating surface. This reduction in the number of separate components minimizes the points of potential failure and reduces the complexity of assembly operations performed by divers, thereby improving operational safety while maintaining structural stability.
Solution Approach 2:
The patent extracts and eliminates the need for multiple separate external redirecting sheaves and complex cable redirection components from the traditional system. By removing these unnecessary external components and integrating their function into the I-tube, the system reduces the number of diver operations required and minimizes safety risks associated with complex assembly procedures.
Data Source
AI summary
A method approximates and connects an off shore riser duct to a floating unit, includes installing a tubular coupling recipient on the floating unit at a riser coupling level, the coupling recipient having an annular side wall extending around a longitudinal axis. A pulling device is on the floating unit at a pulling device level above the riser coupling level. The pulling device pulls a line extended through the coupling recipient and connected to a pulling head at a riser duct upper end. The riser duct upper end is pulled into the coupling recipient, providing a locking mechanism to lock a coupling adapter against downward withdrawal. Extending the line along a curved deviating surface deviates the pulling direction. The curved deviating surface is formed by a deviating member connected to the coupling recipient at a distance from the longitudinal axis smaller than an annular side wall to longitudinal axis distance.