Adjustable Linkage System for Riser Tensioner Alignment
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Solution Overview
Problem
Current pull-up riser tensioner systems on floating offshore platforms face challenges in maintaining consistent tension due to platform oscillations and require manual alignment and handling of heavy shackles, posing safety and efficiency issues.
Innovation Solution
An adjustable linkage system is installed to align and couple tensioner cylinders to the tension ring, utilizing mechanical, hydraulic, or pneumatic positioning mechanisms to facilitate quick and precise connection, reducing manual labor and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual alignment and shackle connection are used to couple tensioner cylinders to the tension ring, then the connection can be made, but the process requires rig personnel working in tight spaces and hazardous environments handling heavy components (300+ pounds), reducing safety and efficiency
Solution Approach 1:
A positioning mechanism serves as an intermediary device between the tensioner cylinder and tension ring. This mechanism includes positioning members that engage with both components and a positioning actuator that automatically aligns and secures the connection, eliminating the need for manual handling of heavy shackles and pins in hazardous environments
Solution Approach 2:
The positioning mechanism enables self-aligning and self-securing connection. The positioning actuator automatically performs the alignment and engagement functions that previously required manual operation, allowing the system to connect itself without human intervention in tight spaces
2Reliability
If pin and bearing connection is used to couple tensioner cylinders to the tension ring, then the connection is secure, but precise alignment is required due to tight tolerances, making the connection process complex and time-consuming
Solution Approach 1:
The positioning mechanism incorporates dynamic adjustment capabilities through the positioning actuator, which can move positioning members to accommodate minor misalignments. This dynamic capability maintains connection reliability while eliminating the need for precise manual alignment during installation
Solution Approach 2:
The positioning actuator performs preliminary alignment actions before the final connection is made. By pre-positioning the tensioner cylinder relative to the tension ring, the system ensures proper alignment is achieved automatically, reducing the complexity of the connection process
3Strength
If heavy shackles (300+ pounds) are used for connection, then the connection can withstand the loads, but the weight makes them difficult to handle with limited to no crane access, reducing productivity
Solution Approach 1:
The connection system is segmented into multiple lighter components: positioning members, positioning actuator, and engagement features. These segmented components work together to provide the necessary connection strength while being significantly lighter and easier to handle than a single heavy shackle
Solution Approach 2:
The traditional mechanical shackle connection system is replaced with a positioning mechanism that uses controlled mechanical engagement through the positioning actuator. This substitution eliminates the need for heavy Shackles while maintaining connection strength and improving handling characteristics
Data Source
AI summary
Improved methods and systems for connecting a riser tensioner system to a riser are disclosed. A system for coupling a tensioner cylinder to a riser includes a top pin connection disposed at a first distal end of the tensioner cylinder. The top pin connection couples the tensioner cylinder to a platform. The tensioner cylinder includes an extension rod and a bottom pin connection is disposed at a second distal end of the tensioner cylinder on the extension rod. A tension ring is coupled to the riser. An adjustable linkage system is coupled to the tensioner cylinder and includes an attachment mechanism and a positioning mechanism. The adjustable linkage system is operable to couple the tensioner cylinder to the tension ring.