Rigid Intermediate Device for Offshore Load Transfer
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Solution Overview
Problem
Existing methods for transferring a load from a first hoisting device to a second hoisting device, especially in offshore operations, require the load to be lowered to a significant depth, which can be challenging due to limitations in crane wire length and depth reach, and may result in loss of control and inefficiency.
Innovation Solution
A method utilizing a rigid intermediate device with spaced connection points connected to flexible hoisting elements of both hoisting devices, allowing for a lateral shift of the load from the first to the second hoisting device at a smaller depth, using a spreader bar or similar structure to manage load distribution and facilitate transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a triangle plate is used to connect the load to both hoisting devices, then the load can be transferred between hoisting devices, but the dimensions are limited to keep it practical in size and weight
Solution Approach 1:
The rigid intermediate device is segmented into multiple connection points (first connection point, second connection point, and third connection point) that can be independently connected to different hoisting devices. This segmentation allows the same intermediate device to facilitate load transfer between various combinations of hoisting devices without requiring a different device for each scenario, thus improving adaptability while maintaining practical dimensions.
2Ease of operation
If the load is lowered to a substantial depth to enable hand-over, then the hoisting elements will not clash with the vessel structure, but the crane wire length becomes governing and the process becomes slow and time consuming
Solution Approach 1:
The rigid intermediate device introduces a horizontal dimension to the load transfer process. By providing spaced connection points that can be laterally positioned, the device enables load transfer to occur at shallower depths through lateral movement rather than requiring vertical descent to substantial depths. This dimensional change allows hoisting elements to clear vessel structures while minimizing the depth required, thereby reducing crane wire length requirements and transfer time.
3Adaptability or versatility
If the load is lowered to a large depth, then the load can be transferred to the deep sea lowering system, but the position and orientation of the load become more difficult to control
Solution Approach 1:
The rigid intermediate device acts as an intermediary between the load and the hoisting devices. By providing multiple stable connection points that maintain fixed geometric relationships, the device creates a controlled interface that simplifies load manipulation. The intermediary structure distributes forces evenly across multiple connection points, making it easier to control load position and orientation during transfer operations, even when operating at varying depths.
4Loss of time
If a rigid intermediate device with spaced connection points is used, then the load transfer can be carried out at a smaller depth, but the device complexity increases
Solution Approach 1:
The rigid intermediate device is designed with multiple connection points that can serve different functions in different scenarios. The same device can connect to one, two, or three hoisting devices depending on the operational requirements. This multi-functionality means that while the device structure is more complex than a simple triangle plate, it eliminates the need for multiple specialized devices, and the added complexity is justified by the significant reduction in transfer time and operational flexibility.
Data Source
AI summary
The present invention provides a method to hand over a load, in particular when submerged, from a first hoisting device to a second hoisting device, comprising the steps of: providing a rigid intermediate device having a first connection point and a second connection point, wherein the first connection point and the second connection point are spaced with respect to each other with a distance of at least 5 meters, and wherein the intermediate device is configured to be connected to the load, connecting the load to the intermediate device, connecting the first hoisting device to the first connection point, suspending the load completely from the first hoisting device, connecting the second hoisting device to the second connection point, and—transferring the load from the first hoisting device to the second hoisting device, until the load is completely suspended from the second hoisting device.