Subsea Buoyancy Unit Flooding for Passive Launch Control
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Solution Overview
Problem
Existing methods for varying buoyancy of subsea structures during launch and towing are complex, especially in deep water, and often require physical intervention or mechanical devices, posing risks and increasing operational costs.
Innovation Solution
A passive variable buoyancy system using a hollow buoyancy unit with permanently open apertures that floods with water to reduce buoyant upthrust, allowing automatic adjustment of buoyancy based on submergence depth, eliminating the need for physical intervention and mechanical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional buoyancy control methods are used during launch and towing, then buoyancy can be adjusted, but the system becomes complex and requires physical intervention or mechanical devices
Solution Approach 1:
The buoyancy unit automatically controls its own buoyancy by flooding through open apertures when submerged, without requiring external mechanical devices or physical intervention. The system serves itself by using the natural flooding process to reduce buoyancy as needed during launch and towing operations.
Solution Approach 2:
The patent replaces complex mechanical buoyancy control devices with a passive flooding system. Instead of using mechanical pumps, valves, or active control systems, the invention uses simple open apertures that allow water to enter the buoyancy unit naturally when submerged, eliminating the need for complicated mechanical intervention.
2Reliability
If mechanical devices are used to adjust buoyancy, then buoyancy can be controlled, but operational costs and risks increase
Solution Approach 1:
The invention extracts and removes all mechanical control devices from the buoyancy system. By taking out pumps, valves, and active control mechanisms, the system achieves higher reliability with simpler operation. The buoyancy control is achieved purely through the passive flooding mechanism enabled by open apertures.
3Strength
If buoyancy is maintained throughout launch and towing, then support is provided, but structural fatigue increases due to surface water dynamics
Solution Approach 1:
The buoyancy unit dynamically adjusts its buoyancy characteristics during the launch and towing process. By flooding when submerged, the system automatically transitions from a high-buoyancy state (when partially submerged during launch) to a low-buoyancy state (when fully submerged during towing), adapting to the changing operational requirements and reducing exposure to surface water dynamics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies buoyancy management by automatically adjusting buoyancy during launch and towing, reducing structural fatigue and operational complexity while ensuring safe and controlled deployment of subsea structures.
Implementation Method 1
providing buoyant support to the structure by displacing water with a hollow buoyancy unit that applies buoyant upthrust to the structure
Implementation Method 2
lowering the buoyancy unit in the water to bring at least one open aperture of the buoyancy unit beneath a surface level of the water, flooding the buoyancy unit with water through the or each open aperture to reduce the buoyant upthrust applied to the structure
Data Source
AI summary
A method of launching an elongate subsea structure such as a pipeline bundle unit into water provides buoyant support to the structure by displacing water with a hollow buoyancy unit that applies buoyant upthrust to the structure. By lowering the buoyancy unit in the water to bring a permanently open aperture of the buoyancy unit beneath a surface level of the water, the buoyancy unit is flooded with water through the or each permanently open aperture to reduce the buoyant upthrust applied to the structure. A corresponding elongate subsea structure is also claimed.