Polymer-Coated Welded Pipe Element for Corrosion-Resistant Flow
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Solution Overview
Problem
Existing fire extinguishing pipeline systems face challenges with corrosion resistance, especially in systems where pipes are not filled with extinguishing fluid, leading to increased costs and flow resistance due to the use of corrosion-resistant materials and complex passivation processes, and the connection of hollow bodies through welding does not reliably achieve long-term corrosion resistance.
Innovation Solution
A method involving the alignment and welding of hollow bodies with a circumferential weld seam that extends completely around the inside of the pipeline element, ensuring complete wetting with a polymer-based layer, which covers the weld root and inner surfaces, thereby enhancing corrosion resistance and reducing flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hollow bodies are joined by welding to create complex piping elements, then structural integrity and pressure tightness are achieved, but corrosion resistance is compromised due to inadequate coating coverage of weld areas
Solution Approach 1:
The weld seam geometry is optimized in advance to ensure complete wetting by the polymer coating. The circumferential edge surfaces are aligned and the weld root is formed to extend sufficiently into the pipe interior, creating a pre-configured surface that guarantees full coating coverage before the coating process occurs.
Solution Approach 2:
The welding parameters are controlled to produce a specific weld root geometry that extends into the pipe interior. By adjusting welding parameters, the weld root is formed with sufficient depth and uniformity to ensure complete wetting by the polymer coating, transforming the weld from a potential corrosion point to a fully protected surface.
2Adaptability or versatility
If pipe connectors are used to join hollow bodies, then assembly flexibility is improved, but flow resistance increases due to additional transition areas
Solution Approach 1:
Multiple hollow bodies are merged into a single integrated structure through welding, eliminating the need for separate pipe connectors. This merging removes additional transition areas and flow disturbances that would be introduced by connectors, thereby reducing flow resistance while maintaining structural integrity.
3Reliability
If corrosion-resistant materials and passivation processes are used, then corrosion resistance is improved, but costs and manufacturing complexity increase
Solution Approach 1:
Instead of using expensive corrosion-resistant materials or complex passivation processes, the invention employs a simple polymer coating applied to conventional metal pipes. The polymer layer acts as a protective barrier that is easier and cheaper to apply than alternative corrosion protection methods, reducing both material costs and manufacturing complexity.
4Reliability
If a polymer coating is applied to welded pipe elements, then corrosion resistance is enhanced, but complete coating coverage of weld areas is difficult to achieve
Solution Approach 1:
The weld seam geometry is optimized in advance to ensure complete wetting by the polymer coating. The circumferential edge surfaces are aligned and the weld root is formed to extend sufficiently into the pipe interior, creating a pre-configured surface that guarantees full coating coverage before the coating process occurs.
Solution Approach 2:
The welding parameters are controlled to produce a specific weld root geometry that extends into the pipe interior. By adjusting welding parameters, the weld root is formed with sufficient depth and uniformity to ensure complete wetting by the polymer coating, transforming the weld from a potential corrosion point to a fully protected surface.
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 method provides long-term corrosion resistance and minimizes flow resistance, allowing for the creation of complex pipeline elements with improved polymer refinement, reducing the need for more powerful pumps or larger pipe diameters, and ensuring effective coating of the weld seams for enhanced protection.
Implementation Method 1
complete wetting with a polymer-based layer, which covers the weld root and inner surfaces
Implementation Method 2
welding the first hollow body to the second hollow body along the circumferential edge surfaces, producing a circumferential weld seam
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a method for producing a polymer-improved pipe element, particularly of a fire-extinguishing facility, and to a pipe element and a pipe system of a fire-extinguishing facility. According to the invention, a first and a second hollow body (101, 102) are provided, a peripheral edge surface of each hollow body is oriented towards the other in order to weld the two hollow bodies to each other along the peripheral edge surfaces such that a peripheral weld seam is produced, which comprises a root extending on the inner side of the pipe element, and a polymer-based layer is applied to the inner side of the pipe element, the polymer-based layer completely covering the inner side of the pipe element and the root of the weld seam.