Flexible Substrate Bonding for Pipe Joint Integrity
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Solution Overview
Problem
Current piping systems face challenges in securely joining components due to high hydraulic pressures and external forces, leading to potential leaks and structural damage, particularly in buried installations where access is difficult and costly for repairs.
Innovation Solution
A mechanical restraint member is applied directly to the exterior surface of piping components, using a flexible substrate bonded with a thermally activated bonding agent to distribute axial forces over a larger area, reducing point stresses and eliminating the need for mechanical penetration, thus enhancing the structural integrity and ease of installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical joint fittings with flanges and bolts are used to connect pipe components, then the joint can resist hydraulic pressure and external forces, but the installation process is complex, time-consuming, and requires precise tightening of multiple bolts in a specific pattern
Solution Approach 1:
The restraint member is divided into discrete segments or blocks that can be independently positioned and secured to the pipe surface. Each segment contains bonding agent compartments that can be separately activated, allowing progressive installation without requiring complete assembly of a single complex fastening system.
Solution Approach 2:
A bonding agent serves as an intermediary substance between the restraint member and the pipe surface, creating a chemical bond that replaces the need for mechanical fasteners. The bonding agent transitions from a liquid or paste state to a cured solid state, forming a durable attachment without requiring bolt tightening sequences.
2Ease of operation
If push-on joint fittings with tapered pipe ends and gaskets are used, then the joint can be assembled without external fasteners, but a considerable force is required to insert the pipe end past the gasket, requiring complex jacking mechanisms
Solution Approach 1:
The bonding agent is pre-applied to the restraint member or pipe surface before assembly. This preliminary bonding layer is then activated (e.g., through heating or chemical reaction) to create a strong adhesive bond that secures the joint without requiring high insertion forces or external jacking mechanisms.
Solution Approach 2:
The mechanical insertion force required in traditional push-on joints is replaced by a chemical bonding mechanism. The bonding agent creates an adhesive bond between the restraint member and pipe, eliminating the need for mechanical force to overcome gasket resistance during assembly.
3Reliability
If mechanical restraint members are applied to buried piping installations, then the joint can withstand external forces from soil movement and settling, but accessing the joint for repair or inspection is difficult and costly
Solution Approach 1:
The bonding agent is extracted or removed from the cured bond in a controlled manner, allowing the restraint member to be detached from the pipe without requiring excavation or destruction of the joint. This enables maintenance and inspection while the pipe remains in its buried installation position.
Solution Approach 2:
The restraint member can be removed and discarded after its service life, or recovered and reused on other piping sections. The bonding system is designed to allow clean separation without damaging the pipe infrastructure, facilitating maintenance while maintaining structural integrity during operation.
4Strength
If bonding agents are applied to pipe surfaces for securing restraint members, then the axial forces are distributed over a larger area reducing point stresses, but the bonding agent must be activated and cured, requiring additional process steps and time
Solution Approach 1:
The bonding agent cures through periodic or staged activation rather than continuous heating. For example, the bonding agent may be activated in sequential zones along the pipe, or cured in stages from the application point outward, reducing the total time and energy required compared to heating the entire bonding surface simultaneously.
Solution Approach 2:
The bonding agent utilizes phase transition (e.g., from liquid to solid, or from uncured to cured state) to achieve bonding. This phase change occurs through chemical reaction, heat, or moisture exposure, creating a strong bond without requiring prolonged heating or complex curing processes. The phase transition provides a clear endpoint for the bonding process.
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
The solution provides a durable, leak-resistant joint that withstands hydraulic pressures and external forces, reduces the risk of structural damage during installation, and simplifies maintenance by distributing forces evenly, thereby improving the reliability and accessibility of piping systems.
Implementation Method 1
a thermally activated bonding agent to distribute axial forces over a larger area
Implementation Method 2
bonded with a thermally activated bonding agent
Data Source
AI summary
A method for joining a first conduit section with a second conduit section. The method includes: a) inserting a first end of the second conduit section in an open first end of the first conduit section with a gasket extending between an inner surface of the first conduit section and an outer surface of the second conduit section; b) positioning a flexible substrate having a bonding agent provided on at least a portion of an inner side of the flexible substrate to extend from an outer surface of the first conduit to an outer surface of the second conduit; c) applying pressure to the flexible substrate whereby the bonding agent is pressed against an outer surface of the first and second conduit sections; and d) heating the bonding agent whereby the bonding agent is secured to the outer surface of the first and second conduit sections.