SWIR Hull Interface for Diver-Less Seawater Intake Installation
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Solution Overview
Problem
The installation of seawater intake risers (SWIRs) for offshore oil and gas production requires diver intervention and support vessels, which is time-consuming and inefficient, especially when relocating vessels that need to access colder seawater for efficient gas liquefaction processes.
Innovation Solution
A structural interface between the SWIR and the hull of a floating unit or sump tank bottom plate allows for diver-less pull-in installation, incorporating an integrated strainer and radial load transfer device for secure and efficient seawater intake, eliminating the need for divers and support vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional diver-assisted installation method is used, then reliable connection is achieved, but installation time and operational costs increase
Solution Approach 1:
The SWIR interface system enables self-aligning and self-sealing through its specialized coupling mechanism. The male and female interfaces automatically align and seal upon engagement without requiring diver intervention, achieving reliable connection through the system's own structural design rather than external assistance.
Solution Approach 2:
The patent introduces a specialized coupling interface as an intermediary between the SWIR and hull that facilitates rapid connection. This intermediary component with its specific geometric features enables automatic alignment and sealing, mediating the connection process to eliminate the need for diver assistance while maintaining reliability.
2Reliability
If traditional diver-assisted installation method is used, then proper sealing is achieved, but operational costs increase
Solution Approach 1:
The sealing mechanism is designed to self-activate upon connection. The elastomeric seal automatically engages with the mating surface when the male and female interfaces are brought together, creating a reliable seal without requiring diver intervention or additional sealing operations.
Solution Approach 2:
The patent replaces the manual mechanical sealing process performed by divers with an automatic mechanical sealing mechanism. The coupling interface incorporates geometric features and elastomeric elements that automatically create the seal through the connection action itself, eliminating the need for manual sealing operations.
3Temperature
If SWIR system is designed for deep water intake, then colder water is obtained for efficient liquefaction, but system complexity and installation difficulty increase
Solution Approach 1:
The coupling interface is designed as a universal connection system that can be used for SWIR installations at various depths. The same basic interface design accommodates different water depths and vessel types, reducing overall system complexity while maintaining the capability to reach cold deep water when needed.
Solution Approach 2:
The SWIR system is divided into modular segments including the interface components, allowing for standardized manufacturing and simplified installation. The segmentation enables the system to maintain complexity at manageable levels while still achieving deep water intake capabilities through modular assembly.
Data Source
AI summary
A slide-in structural interface between a Sea Water Intake Riser (SWIR) and a floating unit hull or sump tank bottom plate permits a pull-in, diver-less installation of the SWIR. Certain embodiments include an integrated, easily maintainable strainer.