Reinforced Butt Joints for Stronger Composite Pipe Joining
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Solution Overview
Problem
Current methods for joining non-metallic pipes, particularly composite pipes, are either costly or prone to failure due to internal stresses and weaknesses at the fused seam, limiting the working pressure and reliability of pipe systems.
Innovation Solution
The method involves wrapping reinforcement materials, such as pre-impregnated fiberglass, around the fused seams of pipes and using a heating apparatus to bond the reinforcement material to the pipes, creating a stronger and more reliable joint by forming grooves and using heat-activated resin, which helps to distribute the bonding resin effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If butt fusing is used to join plastic pipes, then the joining cost is reduced and the process is simplified, but the joint strength is weakened particularly in composite piping
Solution Approach 1:
The patent applies composite materials by wrapping reinforcement material (fiberglass, carbon fiber, or aramid fiber) around the butt joint of composite pipes. This reinforcement layer compensates for the weakness created by butt fusing, particularly addressing the issue where unbonded fiber layers create voids that compromise joint strength. The reinforcement material is bonded to the pipe exterior, creating a composite structure that restores and enhances joint strength while maintaining the simplicity of the butt fusing process.
2Reliability
If mechanical compression fittings such as swage fittings are used to join composite pipe, then the joint reliability is improved, but the cost increases and internal stresses are created causing premature failures
Solution Approach 1:
The patent replaces the mechanical compression fitting system with a thermal bonding system. Instead of using swage fittings that create internal stresses through mechanical compression, the invention uses heat-activated resin in the reinforcement material to bond the joint. This substitution eliminates the harmful internal stresses while maintaining joint reliability, and it reduces cost by avoiding expensive mechanical fittings.
3Strength
If reinforcement material is wrapped around the pipe joint, then the joint strength is enhanced, but the device complexity increases
Solution Approach 1:
The patent applies the self-service principle through the heat-activated resin system. The reinforcement material contains resin that automatically activates when heated during the butt fusing process, bonding the reinforcement to the pipe without requiring additional adhesives or complex application procedures. This self-activating mechanism simplifies the overall process despite adding the reinforcement step, as the bonding function is built into the material itself rather than requiring separate bonding operations.
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 approach enhances the strength and reliability of pipe joints, reducing the risk of premature failure and maintaining the working pressure of the pipe system while being cost-effective compared to traditional mechanical fittings.
Implementation Method 1
heating the wrapped fused ends in the pipe heating apparatus such that the reinforcement material bonds to the pipes
Implementation Method 2
heating the ends of two pipes and pressing them together to fuse the ends
Implementation Method 3
heating the ends of the pipes to their melting points and then fusing the ends together
Data Source
AI summary
A method of joining segments of non-metallic pipe and an apparatus that may be used to form the joint. The pipes may be joined using by melting the ends to form a butt joint, then the joint may be wrapped with one or more sheets of reinforcement material (e.g., pre-impregnated fiberglass, carbon fiber, or aramid fiber). The reinforcement material may be heated using a heating apparatus which allows the material to bond to the pipes to strengthen the joint.