Cladded Pipe Joint Foam Inspection via Transparent Foil
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Solution Overview
Problem
Existing methods for connecting jacketed medium pipes with inner foam and outer plastic layers, such as district heating pipes, face challenges in ensuring proper foam insulation quality due to the inability to visually inspect the foam filling after the connection, leading to potential partial filling or errors in the foam layer.
Innovation Solution
The method employs an additional foam formwork that allows for visual inspection of the filled annular space before applying the final shrink sleeve, ensuring proper foam filling and using a shrink film to cover the foam for quality assurance, with the foam formwork being reusable and designed for easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the annular space is filled with foam using a socket pipe with filling openings, then the foam filling process is simplified, but the quality of the foam layer cannot be checked visually
Solution Approach 1:
A transparent foil is introduced as an intermediary element between the foam filling process and the inspection requirement. The foil allows visual inspection of the foam filling quality while maintaining the simplicity of the socket pipe filling method. The foil acts as a mediator that transmits visual information from the annular space to the inspector without compromising the ease of manufacture.
2Manufacturing precision
If prefabricated foam half-shells are used to seal the connection point, then the foam layer quality can be ensured, but the procedure becomes complex requiring precise fitting
Solution Approach 1:
The inspection function is extracted from the foam half-shells themselves and transferred to a separate transparent foil element. This allows the foam half-shells to focus on their primary function of providing precise fitting and insulation, while the foil handles the inspection requirement, thereby reducing overall procedure complexity.
Solution Approach 2:
The transparent foil serves multiple functions: it allows visual inspection of foam filling quality, maintains the simplicity of the filling process, and eliminates the need for complex precise fitting of inspection mechanisms into the foam half-shells.
3Reliability
If the outer plastic layer is pulled inwards over the foam layer and fastened, then the connection is sealed, but additional wrapping and resin application steps are required
Solution Approach 1:
The transparent foil is combined with the outer plastic layer pulling-in process. The foil is integrated into the existing sealing procedure, allowing inspection to occur as part of the normal assembly process rather than as a separate step, thereby maintaining reliability while minimizing additional complexity.
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 ensures qualitatively impeccable pipe connections by allowing for the inspection of the foam filling, reducing errors, and simplifying the process by eliminating the need for on-site drilling and complex foam filling procedures, while ensuring the foam is properly applied before sealing.
Implementation Method 1
A foam material is introduced through filling openings in the cover shells, which expands to fill the annular space under the cover device
Implementation Method 2
a shrink sleeve is applied to the foamed annular space
Data Source
Figure 1~3
AI summary
A method for joining sheathed pipes (1, 2) is described. The sheath has an inner foam layer (4, 5) and an outer plastic layer (6), wherein the sheath is axially recessed relative to the edge of the medium pipes to be joined. In this method, after joining the medium pipes, a foam mold (8) is placed around the annular space (11) formed between the sheath ends of the two pipes, and the annular space is then filled with foam. After removing the foam mold, a shrink sleeve (14) is shrunk onto the foamed annular space to cover it. This method allows the quality of the foam filling of the annular space to be checked before the shrink sleeve is shrunk onto the pipe.