Cross-linked Polyethylene Pipe Reinforced with Steel Threads
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Solution Overview
Problem
Composite pipes used for district heating with aramid fiber reinforcement exhibit unpredictable aging behavior, leading to significant strength reduction and reduced life expectancy under high loads.
Innovation Solution
A composite pipe design featuring a cross-linked polyethylene pipe reinforced with stainless steel threads, where the threads are wound in a diamond pattern and embedded between polyethylene layers, ensuring reliable welding and high resistance to aging, with an optional oxygen barrier layer and adhesion promoter for improved insulation and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aramid fibers are used to reinforce composite pipes for district heating, then the pipes can withstand high loads, but the pipes exhibit indefinable aging behavior and suffer drastic strength reductions
Solution Approach 1:
The patent changes the material parameter from aramid fibers to stainless steel threads, fundamentally altering the reinforcement material's properties. This substitution eliminates the aging behavior issue while maintaining high strength characteristics, as stainless steel does not exhibit the same degradation patterns as aramid fibers under thermal aging conditions
Solution Approach 2:
The patent employs a composite structure combining cross-linked polyethylene pipe material with stainless steel thread reinforcement. This composite design leverages the corrosion resistance and strength of stainless steel while maintaining the flexibility and thermal properties of the polyethylene matrix, creating a material system with superior long-term stability
2Reliability
If steel threads are used to reinforce composite pipes, then the pipes achieve high resistance to aging and can be produced at low cost, but additional layers and winding processes are required
Solution Approach 1:
The patent extracts the problematic aramid fiber component and replaces it with stainless steel threads, removing the source of aging behavior issues. This extraction allows the use of a simpler, more stable material that does not require complex protective treatments or specialized handling procedures
Solution Approach 2:
The stainless steel threads are pre-formed into specific winding patterns and configurations before being integrated into the pipe structure. This preliminary preparation ensures proper orientation and distribution of reinforcement, eliminating the need for complex post-installation adjustments or adjustments during service
3Strength
If multiple steel threads are wound in a diamond pattern, then the pipes achieve enhanced strength and durability, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs a diamond pattern winding configuration where steel threads are arranged in crossed diagonal patterns around the pipe circumference. This geometric arrangement optimizes load distribution in multiple directions, providing enhanced strength characteristics while maintaining a regular, repeatable manufacturing pattern that simplifies production
Solution Approach 2:
The steel threads are wound in periodic, repeating patterns around the pipe, creating consistent diamond-shaped configurations at regular intervals. This periodic arrangement allows for standardized manufacturing processes and ensures uniform strength characteristics throughout the pipe length
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 cost-effective, long-lasting composite pipe capable of withstanding high loads with enhanced strength and durability, while preventing gas diffusion and ensuring strong adhesion with insulation, thus extending the pipe's life expectancy and maintaining performance over time.
Implementation Method 1
The steel threads have a very high resistance to aging
Implementation Method 2
The oxygen barrier layer significantly prevents gases, especially oxygen, from diffusing through the tube wall
Implementation Method 3
An adhesion promoter layer is expediently arranged between these two layers, which improves the bond between the layer and the barrier layer
Implementation Method 4
a pipe made of cross-linked polyethylene
Data Source
AI summary
The invention relates to a composite pipe having a pipe (1) made of cross-linked polyethylene, and at least one layer surrounding the pipe (1), wherein a reinforcement (3) made of at least one steel thread (4) is disposed between the layer (2) and the pipe (1).