Rail-Guided Multi-Lift Hoist for Riser Bundle Pipe Extraction
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Solution Overview
Problem
Existing methods for removing and replacing satellite tubes or pipes from riser bundles in deep water petroleum collection systems are inefficient, lacking a systematic and effective approach for longitudinal extraction and reinstallation.
Innovation Solution
A specially configured hoist and rail arrangement with separate lifts allows for the independent elevation and longitudinal removal of satellite pipes from riser bundles, utilizing a carriage system that travels along the rail to facilitate the extraction process, and includes the use of cradles, forklifts, and tensioning mechanisms for secure handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional methods are used for removing satellite pipes from riser bundles, then the process is simpler with fewer equipment, but the operational efficiency and control precision are insufficient
Solution Approach 1:
The hoisting apparatus is divided into multiple independent lifts (first lift, second lift, third lift) that can operate separately along the rail. Each lift can independently elevate and position satellite pipes, allowing parallel operations and improving overall productivity without requiring a single complex hoisting system.
Solution Approach 2:
A rail system is introduced as an intermediary structure that supports multiple lifts and enables their movement along the length of the riser bundle. This rail intermediary allows coordinated operation of multiple lifts, providing precise control and positioning capabilities that improve operational efficiency.
2Measurement precision
If multiple lifts are used for satellite pipe removal, then precise manipulation and alignment are achieved, but the device complexity increases
Solution Approach 1:
Each lift is designed as a multi-functional unit that can elevate satellite pipes, move along the rail, and position pipes at different locations. The lifts can serve multiple purposes: initial elevation, longitudinal movement, and final positioning, reducing the need for separate specialized equipment and managing complexity through standardized multi-use components.
Solution Approach 2:
The system adds the longitudinal dimension to pipe manipulation by allowing lifts to travel along the rail. This enables precise positioning not just in the vertical dimension (elevation) but also in the longitudinal dimension (position along the bundle), achieving comprehensive control through coordinated multi-dimensional movement.
3Ease of operation
If satellite pipes are elevated and moved longitudinally, then complete removal from the bundle is achieved, but the operation time increases
Solution Approach 1:
The first lift elevates the satellite pipe before longitudinal movement begins. This preliminary elevation action separates the pipe from intermediate supports early in the process, making subsequent longitudinal movement easier and reducing the total time required for complete removal by preparing the pipe in advance.
Solution Approach 2:
The system maintains continuous useful action by having multiple lifts operate simultaneously at different stages of the removal process. While one lift elevates a pipe, another can be positioning it, and a third can be preparing for the next pipe, ensuring that productive work continues without interruption throughout the operation.
Data Source
AI summary
A method of servicing a pipe bundle or riser bundle employs a specially configured hoist having a rail that supports multiple lifts. A selected satellite pipe/conduit of the pipe bundle is both lifted and pulled horizontally in order to remove it from a plurality of supports that hold the satellite pipes together in spaced apart positions. During removal of a satellite pipe, the lifts elevate, then travel with and hold the pipe as it moves horizontally away from the bundle.