Split J-Lay Guide Assemblies for Narrow-Space Pipe Deployment
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Solution Overview
Problem
Conventional stinger assemblies for J-lay operations in pipe-lay vessels are unitary and inflexible, limiting their ability to operate in narrow spaces and requiring complete retraction for maintenance, which interrupts pipelaying operations.
Innovation Solution
A guide structure comprising independently movable port-side and starboard-side guide assemblies that can adjust to various pipeline angles and retract independently for maintenance, allowing continuous pipelaying and flexible operation within narrow vessel openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a unitary stinger assembly is used, then structural strength and stability are improved, but flexibility and ease of maintenance are worsened
Solution Approach 1:
The stinger assembly is divided into multiple independently movable guide assemblies (port-side and starboard-side) that can operate separately. Each guide assembly functions as an independent unit with its own support structure, allowing selective positioning and maintenance of individual segments while maintaining overall structural integrity through coordinated operation.
2Stability of the object's composition
If a unitary stinger assembly is used, then structural stability is improved, but ease of maintenance and operational continuity are worsened
Solution Approach 1:
The stinger is segmented into independent guide assemblies that can be maintained separately. When one guide assembly requires maintenance, it can be retracted or serviced without affecting the other assemblies, allowing continuous pipelaying operations to proceed with the remaining functional assemblies.
Solution Approach 2:
Each guide assembly is designed with independent mobility and adjustability, allowing dynamic positioning and reconfiguration. This enables maintenance personnel to access and service individual assemblies without dismantling the entire stinger structure, significantly improving ease of maintenance while preserving structural stability through the coordinated arrangement of multiple assemblies.
3Device complexity
If a conventional stinger is used, then simplicity of structure is improved, but adaptability to narrow spaces and angle adjustment are worsened
Solution Approach 1:
The stinger structure is divided into separate port-side and starboard-side guide assemblies that can be independently positioned and adjusted. This segmentation allows each assembly to be optimized for narrow space operations while maintaining the overall functional simplicity of a stinger-based pipelaying system.
Solution Approach 2:
Each guide assembly incorporates independent mobility and angle adjustment capabilities, allowing the stinger to adapt to various operational conditions and narrow vessel openings. The dynamic positioning of individual assemblies provides versatility in confined spaces while preserving the fundamental simplicity of the stinger concept.
4Ease of repair
If the complete stinger is refracted for maintenance, then thorough maintenance is improved, but productivity and operational time are worsened
Solution Approach 1:
The stinger is divided into independent guide assemblies that can be maintained separately. Maintenance personnel can service one or two specific assemblies without retracting the entire stinger structure, allowing thorough maintenance of critical components while minimizing interruption to pipelaying operations. The independent assemblies enable selective maintenance based on actual wear or operational requirements.
Solution Approach 2:
The independent guide assemblies allow continuous pipelaying operations to proceed while maintenance is performed on individual assemblies. The system maintains operational continuity by enabling maintenance of only the necessary components rather than requiring complete stinger retraction, thus preserving productivity while ensuring thorough maintenance of affected parts.
Data Source
AI summary
A guide structure is provided for guiding deployment of a pipeline from a hang-off structure through an opening in a vessel during a J-lay operation. The guide structure comprises a port-side guide assembly and a starboard-side guide assembly for engaging and guiding the pipeline below the hang-off structure, wherein the port and star-board-side guide assemblies are independently moveable to engage and guide the pipeline. The guide assemblies may be mounted to traverse on rails provided within the opening.