Polymer-Coated Welded Pipe Elements for Low-Loss Fire Sprinkler Flow
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Solution Overview
Problem
Existing pipeline elements in fire extinguishing installations, especially complex ones with multiple outlets and welded connections, face challenges with corrosion resistance and increased flow resistance due to weld seams, leading to higher equipment costs and pressure losses.
Innovation Solution
A method involving the alignment and welding of hollow bodies with fully encircling weld seams that have a root extending inside, followed by a polymer-based coating to cover the interior, including the weld seam root, ensuring complete wetting and smooth contour transitions, thereby enhancing corrosion resistance and reducing flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple hollow bodies are connected using pipe connectors, then the pipeline element can be assembled, but the flow resistance increases and C-factor reduces
Solution Approach 1:
The patent merges multiple hollow bodies into a single welded structure, eliminating pipe connectors and their associated flow resistance. The welding process fuses the hollow bodies together, creating a continuous internal flow path without the disruptions caused by connector interfaces.
Solution Approach 2:
The invention extracts and removes pipe connectors from the pipeline assembly, replacing them with direct welding connections. This elimination of intermediate components removes the source of flow resistance and C-factor reduction.
2Reliability
If welding is performed to connect hollow bodies, then pressure tightness is achieved, but corrosion resistance at the connection point deteriorates
Solution Approach 1:
The patent applies polymer coating to the internal surfaces of hollow bodies before welding. This preliminary coating creates a protective barrier that will extend over the weld seam during the welding process, ensuring corrosion protection is established before the potentially corrosive welding operation occurs.
Solution Approach 2:
The polymer coating acts as an intermediary substance between the metal weld seam and the corrosive environment. It mediates the interaction by providing a chemically resistant barrier that protects the underlying metal structure from corrosion while allowing the weld to maintain pressure tightness.
3Object-affected harmful factors
If polymer coating is applied to welded pipeline elements, then corrosion resistance is improved, but complete coverage of the weld seam root is difficult to achieve
Solution Approach 1:
The patent applies polymer coating to the internal surfaces of hollow bodies before welding. This preliminary coating ensures that when the weld seam is formed, the polymer is already present and will be carried over by the weld metal, guaranteeing complete coverage of the weld root without requiring post-weld coating operations.
Solution Approach 2:
The invention merges the coating application process with the welding process by applying coating beforehand. This integration ensures that the polymer coating and weld metal are deposited simultaneously, with the coating being incorporated into the weld structure itself, ensuring complete and uniform coverage.
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 provides long-term corrosion resistance and minimizes flow resistance, allowing for the use of complex pipeline elements as single-part units with improved polymer enhancement, reducing the need for more powerful pumps or larger pipe widths.
Implementation Method 1
The polymer enhancement described in said documents is extremely robust owing to the attained ionic bonding of a polymer-based coating material to the pipe surface
Implementation Method 2
the use of polymer enhancement by autodeposition on the inside of the pipe in pipeline elements of fire extinguishing installations
Implementation Method 3
welding the first hollow body to the second hollow body along the encircling edge surfaces
Data Source
AI summary
The invention relates to a method for producing a polymer-enhanced pipeline element, in particular of a fire extinguishing installation, and to a pipeline element and a pipeline system of a fire extinguishing installation. It is proposed according to the invention to provide a first a first and a second hollow body, to align in each case one encircling edge surface of the hollow bodies with one another, to weld the two hollow bodies to one another along the encircling edge surfaces such that an encircling weld seam is generated which has a root extending on the inside of the pipeline element, and to apply a polymer-based layer to the inside of the pipeline element, wherein the polymer-based layer completely covers the inside of the pipe element and the root of the weld seam.