Eccentric Test Plug for Pipe Elbow Sealing
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Solution Overview
Problem
Conventional test plugs fail to form a reliable, fluid-tight seal in pipe elbows during hydrotesting due to the complex inner geometries of elbow joints, requiring additional straight pipe sections for fitting, which is time-consuming and inefficient.
Innovation Solution
The development of test plugs with eccentrically aligned components, including a seal, grippers, and a shaft, that self-adjust and float to conform to the inner pipe geometry, allowing for a secure grip and seal in both elbow and straight pipe sections without the need for additional pipe sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional test plugs are used in pipe elbows, then the testing process requires additional straight pipe sections to be welded and removed, but this significantly increases time consumption and operational complexity
Solution Approach 1:
The test plug incorporates an asymmetric design where the sealing surface and gripper elements are positioned eccentrically relative to the shaft centerline. This asymmetric configuration allows the plug to self-align with the curved inner geometry of pipe elbows, creating effective seals and secure grips without requiring additional straight pipe sections, thereby eliminating time-consuming welding and removal operations
Solution Approach 2:
The test plug employs dynamic adjustment mechanisms including floating camming elements and movable gripper segments that can self-adjust their positions during insertion and operation. This dynamic capability enables the rigid plug body to adapt to the curved geometry of pipe elbows, achieving proper sealing and gripping positions automatically without requiring manual intervention or additional pipe sections
2Ease of operation
If conventional test plugs are used in pipe elbows, then additional pipe modifications are required, but this increases device complexity and operational difficulty
Solution Approach 1:
The asymmetric positioning of sealing surfaces and gripper elements relative to the shaft centerline enables the test plug to naturally conform to the curved geometry of pipe elbows. This design eliminates the need for complex pipe modifications such as welding straight sections, thereby simplifying the installation process and reducing operational difficulty while maintaining ease of use
Solution Approach 2:
The test plug incorporates self-aligning and self-adjusting features that automatically adapt to the pipe elbow geometry during insertion. The floating camming elements and movable components self-position to achieve proper sealing and gripping without requiring external assistance or complex preparation procedures, thereby simplifying operation and reducing device complexity
3Reliability
If conventional test plugs are used in pipe elbows, then reliable sealing cannot be achieved due to complex inner geometries, but modifying the plug design increases manufacturing complexity
Solution Approach 1:
The asymmetric configuration of sealing surfaces and gripper elements is designed to match the typical curved geometry of pipe elbows. This asymmetric design achieves reliable sealing by positioning the sealing surface to contact the curved inner wall at the optimal location, ensuring fluid-tight seals without requiring overly complex manufacturing processes. The eccentric offset can be implemented using standard machining operations
Solution Approach 2:
The dynamic adjustment mechanisms including floating camming elements and movable gripper segments provide adaptability to variations in pipe elbow geometry. These mechanisms automatically self-adjust during insertion to achieve proper sealing contact, ensuring reliable seals across different pipe configurations. The dynamic features are implemented using conventional mechanical components that are manufacturable with standard processes
Data Source
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AI summary
A test plug (10, 110, 210) for insertion into and plugging of an open end of an elbow pipe is provided. The test plug (10, 110, 210) includes a resilient sealing element (24, 124, 224) and set of gripper segments (28, 128, 228) carried on a shaft (12, 112, 212). The set of gripper segments (28, 128, 228) are movable relative to the shaft (12, 112, 212) between pipe-gripping and pipe-non-gripping positions such that, when the test plug (10, 110, 210) is placed in sealing and gripping engagement relative to an inner diameter wall of an elbow pipe, the set of gripper segments (28, 128, 228) are positioned in eccentric relation to at least one of the sealing element (24, 124, 224) and the shaft (12, 112, 212).