Multi-Layer Pipe Structure for Hydrocarbon Barrier Welding
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Solution Overview
Problem
Existing multi-layered pipes for transporting drinking water through contaminated ground face challenges such as hydrocarbon molecule ingress and complexity in layer formation, which can lead to weaknesses in the pipe joints and increased production complexity.
Innovation Solution
A multi-layered pipe design featuring a polyolefin inner layer, a non-metallic barrier layer with enhanced resistance to hydrocarbon molecules, a protective PET layer, and a peelable layer formed by extrusion, allowing for co-extrusion production and simplified logistics, while preventing hydrocarbon diffusion and maintaining clean surfaces for welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is added to prevent hydrocarbon diffusion, then protection against hydrocarbon molecules is improved, but the pipe structure becomes more complex and production difficulty increases
Solution Approach 1:
The patent implements a nested multi-layer structure where the polyolefin layer is positioned inside the barrier layer, which is in turn inside the protective layer. This nested arrangement allows each layer to fulfill its specific function (mechanical strength, hydrocarbon barrier, physical protection) while maintaining a compact integrated pipe structure that reduces overall complexity compared to separate assembly approaches.
Solution Approach 2:
The patent employs composite materials by combining different polymer layers with distinct properties: polyolefin for mechanical strength and flexibility, barrier layer material (such as PVDF or PTFE) for hydrocarbon resistance, and protective layer material for abrasion and impact resistance. This composite structure achieves superior overall performance while managing the complexity through material science integration rather than mechanical assembly.
2Reliability
If multiple layers are used to prevent hydrocarbon ingress, then protection effectiveness is improved, but production complexity and equipment requirements increase
Solution Approach 1:
The patent merges the production of multiple distinct layers into a single co-extrusion process. The extrusion device is configured with multiple dies that simultaneously extrude the polyolefin layer, barrier layer, and protective layer in one continuous operation, creating the multi-layered pipe structure without requiring separate production steps or additional assembly equipment.
Solution Approach 2:
The extrusion device is designed as a multi-functional apparatus capable of simultaneously handling multiple materials and creating multiple layers in a single process. This universal equipment performs the functions of what would otherwise require separate extrusion machines, assembly fixtures, and joining equipment, thereby simplifying production while maintaining the integrity of the multi-layer structure.
3Manufacturing precision
If outer layers are removed before welding, then welding quality is improved, but additional processing steps are required
Solution Approach 1:
The patent applies local quality by providing welding access only at specific locations where joints are required. The protective and barrier layers are designed with localized openings or thin-walled sections at welding positions, allowing welders to access the polyolefin layer for high-quality welding while maintaining continuous protection in all other sections of the pipe. This eliminates the need to remove layers along the entire pipe length.
Solution Approach 2:
The patent incorporates preliminary action by pre-configuring the multi-layer structure with built-in welding access features during the co-extrusion process. These features, such as localized thin sections or integrated welding ports, are created in advance as part of the pipe manufacturing, eliminating the need for post-production layer removal and streamlining the welding process without compromising welding quality.
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 effectively prevents hydrocarbon molecule diffusion into the drinking water supply, reduces production complexity and equipment needs, and ensures strong, clean surfaces for pipe welding, enhancing the reliability and efficiency of the pipe system.
Implementation Method 1
The barrier layer is formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to diffusion therethrough of hydrocarbon molecules
Implementation Method 2
The peelable layer is formable around the polyolefin inner layer by means of extrusion
Data Source
AI summary
A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.