Polymer Pipe Coupling Assembly for Chemical Barrier Integrity
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Solution Overview
Problem
Conventional methods for joining multilayer polymer pipes, such as butt fusion and electrofusion, result in the exposure of structural layers to pipeline fluids, compromising the chemical barrier layer and necessitating chemical derating factors, which limits their use in applications prone to chemical attack.
Innovation Solution
A pipe coupling assembly comprising an insert with an adhesive and an external coupler that forms a fluid-tight seal across the joint, ensuring the chemical barrier layer remains intact by sealing the annular gap between pipe ends with an adhesive and using an electrofusion coupler to bond the outer layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional joining methods (butt fusion or electrofusion) are used to join multilayer polymer pipes, then the joining process is simple and widely applicable, but the chemical barrier layer is exposed at the joint, compromising its integrity and requiring chemical derating factors
Solution Approach 1:
The joining system is divided into multiple functional components: an insert placed inside the pipe that provides a sealing surface, an adhesive applied to seal the annular gap between the insert and pipe, and an external coupler for mechanical joining. This segmentation allows each component to perform its specific function while collectively maintaining the chemical barrier layer integrity.
Solution Approach 2:
An insert is introduced as an intermediary element between the joining process and the pipe's chemical barrier layer. This insert provides a sealing surface for the adhesive and prevents the adhesive from contacting the chemical barrier layer, thereby maintaining its integrity while still enabling effective sealing of the joint.
2Reliability
If an insert with adhesive is used to seal the annular gap, then the chemical barrier layer integrity is maintained, but the device complexity increases
Solution Approach 1:
The insert serves multiple functions simultaneously: it provides a sealing surface for the adhesive, prevents the adhesive from contacting the chemical barrier layer, and facilitates proper positioning of the joint components. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Ease of manufacture
If the chemical barrier layer is interrupted at joints, then conventional joining methods can be used, but the pipe's long-term strength is adversely impacted in chemically aggressive environments
Solution Approach 1:
The insert and adhesive sealing system is installed before the external coupler is applied, creating a preliminary seal that protects the chemical barrier layer integrity. This preliminary action ensures that the chemical barrier remains intact throughout the joining process, preventing long-term strength degradation in chemically aggressive environments.
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 provides a fluid-tight seal that maintains the chemical barrier layer integrity, allowing multilayer polymer pipes to operate without chemical derating factors, enhancing their performance in chemically aggressive environments.
Implementation Method 1
an adhesive configured for sealing the annular gap between the insert and the end regions
Implementation Method 2
an electrofusion coupler to bond the outer layers
Data Source
Figure 1~2
Figure 3
Figure 4~7
AI summary
A pipe coupling assembly (200) for joining two sections (100a), (100b) of polymer pipe, the pipe coupling assembly (200) comprising: an insert (202) configured for positioning within an end region (105a) of a first section of polymer pipe (100a) and an end region (105b) of a second section of polymer pipe (100b), such that an annular gap (208) is formed between the insert (202) and the end regions (105a), (105b) of polymer pipe; an adhesive (206) configured for sealing the annular gap (208) between the insert (202) and the end regions (105a), (105b); and an external coupler (204) for positioning over the end regions (105a), (105b) and joining the first and second sections (100a), (100b) of polymer pipe.