Coextruded Slurry Pipe Inner Layer Abrasion Resistance
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Solution Overview
Problem
Pipes used for transporting slurries experience significant abrasion due to solids entrained in the fluid, leading to premature failure, increased maintenance costs, contamination of conveyed materials, and reduced hydraulic performance, which complicates the processing and transportation of valuable solids in industries like mining.
Innovation Solution
A pipe with a coextruded structure comprising a polyethylene main body and an abrasion-resistant synthetic resin inner layer, along with a light-colored outer layer for thermal management, which reduces temperature-related stress and abrasion, and is designed for easy welding and bending, with adjustable thickness to address wear patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material pipe is used for slurry transport, then the pipe structure is simple and easy to manufacture, but the pipe suffers significant abrasion from solids in the slurry leading to premature failure
Solution Approach 1:
The pipe is constructed as a composite structure with a polyethylene main body providing flexibility and corrosion resistance, and a thermoplastic inner layer providing abrasion resistance. This multi-material approach resolves the contradiction by combining materials with complementary properties to simultaneously achieve reliability and extended service life while managing the increased structural complexity through coextrusion manufacturing.
Solution Approach 2:
The inner layer of the pipe is made from a different material than the main body, specifically targeting the region most susceptible to abrasion from slurry solids. This local differentiation of material properties allows the pipe to have enhanced abrasion resistance exactly where needed, while the rest of the pipe maintains the beneficial properties of polyethylene, thus improving reliability without uniformly increasing complexity throughout the entire structure.
2Strength
If the pipe wall is made thicker to resist abrasion, then the pipe strength increases, but the flexibility and ease of installation decreases
Solution Approach 1:
The composite construction allows the inner abrasion-resistant layer to be optimized for strength and wear resistance, while the outer polyethylene layer maintains flexibility and ease of handling. This resolves the contradiction by distributing different functional requirements to different material layers, enabling the pipe to achieve both high abrasion resistance and adequate flexibility without requiring uniform wall thickening throughout the entire pipe structure.
3Reliability
If repair or replacement of an abraded pipe is performed, then the pipe integrity is restored, but the slurry transport must be terminated causing downtime and cost penalties
Solution Approach 1:
The pipe is designed with an inner layer specifically engineered for high abrasion resistance, which serves as a preliminary protective measure against wear from slurry solids. This preliminary action extends the service life of the pipe significantly, delaying the need for repair or replacement and thereby reducing downtime and associated cost penalties, while maintaining pipe integrity throughout the extended operational period.
4Duration of action of stationary object
If the pipe material is made more abrasion resistant, then the pipe service life extends, but the material cost and manufacturing complexity increases
Solution Approach 1:
The pipe uses a composite structure where only the inner layer requires high abrasion resistance, while the outer layer uses standard polyethylene. This selective application of expensive abrasion-resistant material only where needed reduces overall material costs compared to making the entire pipe from expensive material, while the coextrusion manufacturing process integrates the multi-layer construction into a single efficient operation, managing manufacturing complexity without significantly increasing production complexity.
Solution Approach 2:
The abrasion-resistant material is applied locally only to the inner surface of the pipe where it contacts the slurry, rather than throughout the entire pipe structure. This local quality approach extends pipe service life by protecting the critical wear zone while minimizing the amount of expensive material used and reducing manufacturing complexity compared to uniformly treating the entire pipe with abrasion-resistant material.
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 pipe exhibits reduced abrasion and thermal stress, extending maintenance intervals, minimizing downtime and energy costs, while maintaining the integrity of transported materials and improving hydraulic efficiency.
Implementation Method 1
The outer layer may be formed from a light color resin for reflecting heat. The light color resin reflects sunlight, and therefore maintains a lower temperature for the pipe
Implementation Method 2
The reduction in temperature-related dimensional changes significant reduces stress on the pipe. Dimensional changes between those fixed locations can generate significant uncontrolled bending or snaking of the pipe
Data Source
AI summary
The invention relates to a pipe that has a plurality of layers including a main pipe body with opposite inner and outer circumferential surfaces. The pipe further includes an inner layer with an outer circumferential surface that is in integral face-to-face contact with the inner circumferential surface of the main pipe body. The inner layer is formed from a synthetic resin that is more abrasion resistant than the main pipe body.