Tilt-Compensating Turntable for J-Lay Pipelaying Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pivotable J-lay towers in marine pipelaying systems face challenges in maintaining a stable welding platform during tilting movements, especially when dealing with double-walled pipelines, as existing solutions struggle to accommodate the dynamic changes in pipe orientation and elevation requirements.
Innovation Solution
A turntable assembly with a tilt-compensating mechanism, supported by driveable carriages and hydraulic actuators, ensures the turntable remains level and adjustable in height to accommodate the J-lay tower's pivoting movements, allowing for effective routing of services like power and data to welding apparatuses, and enabling welding at different elevations for pipe-in-pipe arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the J-lay tower is made pivotable to accommodate changing exit angles and vessel steering, then adaptability and steering freedom are improved, but maintaining a stable welding platform becomes more difficult
Solution Approach 1:
The turntable is made dynamically adjustable through driveable carriages that can move along the tower structure, allowing the welding platform to adapt its position and orientation in response to tower pivoting while maintaining operational stability
Solution Approach 2:
The turntable acts as an intermediary element between the pivotable tower and the welding apparatus, absorbing and compensating for tower movements to provide a stable platform for welding operations
2Stability of the object's composition
If the tower is fixed at a specific angle, then welding platform stability is improved, but adaptability to different water depths and pipeline characteristics deteriorates
Solution Approach 1:
The tower transitions from a fixed-angle structure to a dynamically adjustable pivotable structure, enabling real-time adaptation to different water depths and pipeline characteristics while maintaining welding stability through the turntable compensation mechanism
3Adaptability or versatility
If the turntable is made adjustable to accommodate pipe-in-pipe welding at different elevations, then versatility is improved, but device complexity increases
Solution Approach 1:
The turntable mechanism is designed with multi-functionality to perform both horizontal rotation and vertical elevation adjustment, accommodating various welding positions including pipe-in-pipe configurations without requiring separate specialized mechanisms
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
The solution enhances operational stability and efficiency by maintaining a stable working platform during tilting operations, facilitating seamless welding and service delivery across varying pipe orientations and elevations, thereby extending the 'weather window' for pipelaying and improving pipeline fatigue life.
Implementation Method 1
The tilt-compensating mechanism comprises at least one support that is driveable up and down with respect to the tower
Data Source
AI summary
A turntable assembly for performing welding or other operations in a pivotably-mounted J-lay tower is disclosed. The assembly includes an annular turntable supported by a base frame to turn about a pipe string in use and a tilt-compensating mechanism acting on the base frame to level the turntable as the tower pivots in use. The tilt-compensating mechanism includes at least one support that is driveable up and down with respect to the tower. In the embodiment disclosed, the support is a carriage movable along an upright track that pivots with the tower.