Swivel Thread Protector Assembly for Side-Torque Stability
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Solution Overview
Problem
Conventional thread protectors for pipes are prone to dislodging due to side torque, which can expose the pipe ends to damage and corrosion, and are difficult to unscrew when pipes are stacked, leading to potential damage and operational challenges.
Innovation Solution
A thread protector assembly featuring a swivelable outer sleeve and cap design, where the outer sleeve is freely rotatable relative to the cap, preventing torque transfer and allowing easy unscrewing by rotation of the cap, thus minimizing the risk of dislodging and protecting the tubular connection from impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thread protectors are used with fixed outer sleeves, then the protectors can provide basic thread protection, but they are prone to dislodging due to side torque and vibration during transport
Solution Approach 1:
The outer sleeve is designed to rotate freely relative to the cap, allowing the protector assembly to dynamically adapt to side torque and vibration forces during transport. This rotational freedom prevents torque accumulation that would otherwise cause dislodging, while the threads between the cap and tubular maintain secure attachment.
2Reliability
If conventional thread protectors are tightly secured to prevent dislodging, then attachment stability improves, but they become difficult to unscrew when pipes are stacked
Solution Approach 1:
The rotatable outer sleeve allows the cap to be unscrewed by rotating it independently without needing to rotate the entire outer sleeve. This dynamic separation of rotation requirements makes removal easy even when pipes are stacked, while the threaded connection ensures secure attachment during transport.
3Object-affected harmful factors
If the outer sleeve is made with larger outer diameter than the pipe to provide protection, then protection effectiveness improves, but torque from protector contact can loosen the attachment
Solution Approach 1:
The outer sleeve is designed with a larger outer diameter than the pipe for effective protection, while its ability to rotate freely relative to the cap prevents torque transfer from external impacts to the threaded connection. This dynamic design allows the sleeve to absorb impact forces through rotation rather than transmitting them to loosen the attachment.
4Device complexity
If thread protectors are designed with fixed components, then structural simplicity is maintained, but they cannot accommodate dynamic side loads during transport
Solution Approach 1:
The invention introduces a simple rotational degree of freedom between the outer sleeve and cap, allowing the structure to accommodate dynamic side loads during transport. This minimal dynamic element enables the protector to respond to lateral forces without complex mechanisms, maintaining overall structural simplicity while effectively handling side loads.
Data Source
AI summary
A thread protector assembly has an outer sleeve and a cap having a portion positioned interior of the outer sleeve. The portion of the cap is adapted to engage with a threaded surface of a tubular. The cap has an end exposed outwardly of the outer surface. The outer sleeve is freely rotatable or swivelable relative to the cap. The outer sleeve is in snap-fit relationship with said cap. The outer sleeve has an upset at one end thereof that overlies the outer diameter of the shoulder of the tubular.