Offshore Mooring System for Cargo Vessel Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Offshore vessel loading is hindered by environmental forces like wind, waves, and current, causing undesirable movement and making loading hazardous, especially for smaller vessels, as they are exposed to these forces, leading to difficulties in maintaining stable conditions for cargo transfer.
Innovation Solution
A system and method that optimizes the positioning of large cargo vessels within an offshore mooring field using multiple mooring buoys and computer-based analysis to minimize vessel movement and create a sheltered 'lee' area by determining the best mooring buoys and line configurations, allowing for safe and efficient loading across varying weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-point mooring is used, then vessel can be moored offshore, but vessel movement (heading, pitch, roll) increases due to environmental forces
Solution Approach 1:
The single-point mooring system is segmented into multiple mooring points (at least two) positioned at different locations on the vessel. This segmentation allows the vessel to be restrained in multiple directions, reducing unwanted movements such as heading changes, pitch, and roll while maintaining offshore mooring capability.
2Productivity
If trans-shipper and barge are exposed to environmental forces, then loading can be performed, but loading becomes hazardous and difficult in bad weather
Solution Approach 1:
The invention positions the larger vessel to act as a windbreak and shelter for the trans-shipper and barge. The harmful environmental forces (wind, waves, current) that affect the moored vessel are converted into a protective barrier, creating a sheltered area on the leeward side where smaller vessels can operate with reduced exposure to these forces.
3Adaptability or versatility
If mother ship moves to various headings in response to environmental forces, then vessel can maintain single-point mooring, but relative ship-to-ship motion increases
Solution Approach 1:
The invention employs dynamic positioning through multiple mooring lines that can be independently adjusted in length and tension. This allows the mooring system to adapt to changing environmental conditions while maintaining vessel position stability, eliminating the need for the vessel to rotate or change heading in response to wind, waves, and current.
Data Source
AI summary
A system and method for offshore loading of large cargo vessels, or motherships. The system includes a plurality of mooring stations, which may be mooring buoys, positioned in an offshore mooring field proximal an onshore cargo loading facility. A mothership is positioned within the mooring field and moored via bow and stern lines to two or more different mooring stations. Environmental data, including wind, wave, and current data, as well data regarding the physical characteristics of the mothership and movement (roll/pitch/heave) of the mothership are collected by remote transmitting and sensing devices. This data is processed by numerical analysis in a digital processor, namely a computer, to determine optimum mooring line length and tension, and mooring station locations, in order to minimize mother ship movement and create an optimum “lee” loading area adjacent the mothership. Cargo is transferred to the mothership by a trans-shipper moored to the mothership.