Pipe Coupling Seal With Intentional Leak Path for Installation Checks
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Solution Overview
Problem
In piping networks with numerous mechanical couplings and fittings, improperly installed components can maintain a fluid-tight seal during low-pressure testing, leading to false indications of proper installation, and may leak only under service pressure, causing issues when full service pressure is applied.
Innovation Solution
The use of seals with strategically placed projections on the sealing surfaces that create a leak path until the components are properly tightened, ensuring that a low-pressure test reliably detects improper installation and preventing premature sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal is compressed between the coupling segments and pipe elements upon tightening, then a fluid-tight joint is formed, but improper installation cannot be detected until full service pressure is applied
Solution Approach 1:
The leakage path is created in advance during seal installation, before the coupling is tightened or pressurized. This preliminary configuration allows detection of installation errors during the assembly process itself, rather than waiting for service pressure application.
Solution Approach 2:
The leakage path provides immediate feedback during installation about whether the seal is properly positioned and whether the coupling will achieve proper compression. This feedback mechanism allows real-time verification of installation quality.
2Reliability
If the seal engages the pipe elements before bolt tightening, then the coupling appears fluid-tight during testing, but the bolts are not sufficiently tightened
Solution Approach 1:
The potential harm of premature sealing is converted into a benefit by intentionally designing a controlled leakage path. This leakage path, which might seem like a defect, actually serves as a useful indicator that prevents the more serious harm of undetected improper installation.
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
This design enhances the reliability of pressure testing, ensuring that all couplings and fittings are properly installed before full service pressure is applied, thereby preventing leaks and maintaining a fluid-tight seal only when correctly assembled.
Implementation Method 1
The seal has circumferential sealing surfaces that engage the outer surfaces of the pipe elements when the pipe elements are inserted into or otherwise engaged with the coupling or fitting. Upon proper tightening of the bolts the seal is compressed between the coupling segments or the housing portions and the pipe elements
Data Source
Figure 1A~2
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Figure 5~6
AI summary
A coupling (34) for joining pipe elements (56, 58) in end to end relation, said coupling (34) comprising: a plurality of segments (42, 44) attached to one another end to end and surrounding a central space (46), each of said segments (42, 44) having a channel (48) extending circumferentially around and facing said central space (46); connection members (50) being positioned at opposite ends of each of said segments (42, 44), said connection members (50) being adjustably tightenable for drawing said segments (42, 44) toward one another; a seal (10) positioned between said segments (42, 44) comprising at least a first projection (20) extending from said first sealing surface (18) and forming an intended leak path.