Subsea Bundle Section Bulkheads for Leak-Tight End Connections
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Solution Overview
Problem
Current methods for assembling longer pipeline bundles are hindered by the difficulty in connecting shorter sections end-to-end, requiring complex and costly welding processes, multiple subsea operations, and inadequate mechanical and leak-tight connections, especially in deep underwater environments.
Innovation Solution
The use of transverse bulkheads with integral fluid coupling formations and mechanical coupling mechanisms allows for leak-tight and mechanical connection of pipeline bundle sections, enabling efficient assembly of longer bundles by aligning and pressing bulkheads together, with optional bolted flanges or hydraulic connectors for secure sealing and tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional welding processes are used to connect pipeline bundle sections, then mechanical connection strength can be achieved, but the complexity and cost of the assembly process increases significantly
Solution Approach 1:
A bulkhead acts as an intermediary component between pipeline bundle sections, providing both mechanical support and fluid sealing functions. The bulkhead includes a carrier pipe portion that receives elongate elements and a bulkhead portion that forms the end closure, creating a standardized interface for connecting sections without requiring complex welding operations.
Solution Approach 2:
The pipeline bundle is divided into modular sections that can be assembled independently. Each section includes its own bulkhead with integrated coupling formations, allowing sections to be manufactured separately and then connected through standardized mechanical interfaces rather than requiring the entire bundle to be welded as a single structure.
2Reliability
If welding inspections are performed on bundle sections, then connection reliability can be ensured, but the time and cost of the assembly process increases
Solution Approach 1:
The bulkhead serves as a standardized intermediary component with pre-integrated coupling formations that provide both mechanical strength and fluid sealing. This standardized interface allows for simplified inspection protocols compared to custom welding inspections, as the coupling formations can be designed with built-in alignment features and seal geometries that are easier to verify.
3Adaptability or versatility
If multiple subsea operations are performed to assemble pipeline bundles, then installation flexibility is improved, but the operational complexity and cost increases
Solution Approach 1:
The bulkheads and coupling formations are pre-assembled and pre-tested onshore before the pipeline bundle sections are deployed subsea. This preliminary assembly allows for quality control and alignment verification to be performed in controlled conditions, reducing the complexity of subsea operations and minimizing the number of interventions required after installation.
4Reliability
If leak-tight connections are achieved through complex welding, then fluid sealing reliability is improved, but the manufacturing complexity and cost increases
Solution Approach 1:
The bulkhead acts as an intermediary component that provides fluid sealing through its bulkhead portion, which forms an end closure for the carrier pipe. The integrated design of the bulkhead with the carrier pipe portion creates a standardized interface that simplifies manufacturing compared to custom welding procedures, while maintaining leak-tight connections through pre-formed seal geometries.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
A bundle section (20) of a subsea pipeline bundle comprises a rigid carrier pipe (12) having an end closed by a transverse bulkhead (26A, 26B), and one or more fluid conduits in fluid communication with an opening that penetrates the bulkhead. Fluid coupling formations such as a spigot or a recess on an outer face of the bulkhead surround the opening. Leak-tight coupling between successive fluid conduits is effected when the bulkheads of two such bundle sections are brought together. This forces together opposed complementary fluid coupling formations of the bulkheads. The bulkheads connect the adjoining bundles sections fluidly and mechanically.