Modular Pipelay System for Mechanical Interference Fit Connections
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Solution Overview
Problem
Conventional offshore pipelay systems are not configured to utilize the benefits of mechanical interference fit technologies, which are faster and more cost-effective than welding, due to financial viability issues and complexity in vessel configuration.
Innovation Solution
A modular pipelay system comprising adjustable pipe storage modules that can be assembled on various vessel types, featuring a load-bearing integrated structure for efficient deck space use, mechanized pipe handling, and automated conveyor systems, allowing for the deployment of mechanical interference fit connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding methods are used to join pipe sections, then reliable and well-understood connections are achieved, but the process is time consuming and expensive due to the time required to complete and inspect each weld
Solution Approach 1:
The patent replaces the welding process (thermal/chemical system) with a mechanical interference fit system using expansion tools and gripping mechanisms. This mechanical substitution eliminates the need for heat application, cooling time, and weld inspection, thereby significantly reducing joint preparation time while maintaining connection reliability through precise mechanical engagement.
Solution Approach 2:
The invention extracts and eliminates the time-consuming welding and inspection steps from the pipe joining process. By using a mechanical interference fit system, the patent removes the need for complex weld procedures and x-ray inspection, keeping only the essential mechanical connection steps which are much faster to execute.
2Productivity
If a pre-assembly line with multiple weld stations is used to perform multiple welds concurrently, then welding efficiency is improved, but the vessel requires a large deck to accommodate the length of the pre-assembly line
Solution Approach 1:
The patent segments the pipe handling system into modular components including individual storage racks, conveyor sections, and expansion tool stations. This modular segmentation allows the system to be configured in a compact arrangement on the vessel deck, eliminating the need for a long linear pre-assembly line while maintaining the capability to handle multiple pipes efficiently.
Solution Approach 2:
Instead of arranging equipment in a linear fashion along the deck (one-dimensional layout), the patent utilizes vertical stacking and three-dimensional space utilization. Pipes are stored in vertically arranged racks, and the assembly process occurs in a compact volumetric footprint rather than requiring extensive horizontal deck space.
3Productivity
If existing pipelay vessels are configured for mechanical interference fit technologies, then construction speed and cost-effectiveness are improved, but the configuration is not financially viable and requires complex vessel modification
Solution Approach 1:
The patent designs a universal mechanical interference fit system that can be adapted to various existing vessel types without requiring extensive custom modifications. The modular equipment can be installed on different deck configurations and vessel sizes, making the technology economically viable across multiple vessel platforms rather than requiring dedicated specialized vessels.
Solution Approach 2:
The system allows for parameter adjustments in equipment sizing, positioning, and capacity to match different vessel characteristics. By variableizing the configuration parameters rather than requiring fixed complex installations, the patent makes adaptation to existing vessels financially viable and operationally simple.
Data Source
AI summary
The invention provides a modular system for use in an offshore pipelay operation, and apparatus and a method of use. The system comprises a plurality of pipe storage modules, each comprising a rack for accommodating a plurality of pipeline sections. The pipe storage modules are configured to be assembled together to form an integrated structure on a deck of a vessel.