Insulated Pipe Coupling for Galvanic Corrosion Prevention
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Solution Overview
Problem
Existing coupling devices for connecting tank pipes made of different metallic materials to external pipes suffer from galvanic corrosion, leading to potential water leakage and increased costs due to additional components required to mitigate corrosion.
Innovation Solution
A coupling device featuring a rotatable nut element made of the same material as the tank pipe, paired with a washer made of an electrical insulating material positioned between the nut and the external pipe, effectively uncoupling the nut from the external pipe and preventing galvanic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard coupling device with a nut and gasket is used to connect two pipes of different materials, then the pipes can be fluidically connected, but galvanic corrosion occurs between the different metallic materials leading to potential water leakage
Solution Approach 1:
The patent introduces a dielectric fitting as an intermediary component between the first pipe and the second pipe. This fitting acts as a mediator that prevents direct contact between the different metallic materials, thereby eliminating the galvanic corrosion pathway while still allowing fluidic connection through its internal passage.
Solution Approach 2:
The coupling device is segmented into three distinct parts: the first pipe, the dielectric fitting, and the second pipe. This segmentation separates the metallic components that would otherwise be in direct contact, inserting the non-conductive dielectric material as a barrier to prevent electrochemical reactions.
2Object-affected harmful factors
If a dielectric fitting is added between the two pipes to prevent galvanic corrosion, then corrosion is avoided, but additional costs and device complexity increase
Solution Approach 1:
The dielectric fitting performs multiple functions simultaneously: it provides the fluidic connection passage between pipes, acts as a mechanical connector replacing the need for separate nuts and gaskets, and serves as the dielectric barrier against galvanic corrosion. This multi-functionality reduces the overall component count despite adding a specialized element.
Solution Approach 2:
The patent merges the functions of connection and corrosion protection into a single integrated dielectric fitting component. Rather than using separate connectors and protective barriers, the fitting combines these roles, simplifying the assembly process and reducing the number of parts that need to be installed and maintained.
3Object-affected harmful factors
If a dielectric fitting is added to prevent galvanic corrosion, then corrosion is avoided, but the device becomes bulkier and less compact
Solution Approach 1:
The dielectric fitting is designed with a nested structure where the fluid passage is embedded within the dielectric material itself. The fitting accommodates the pipes in a compact arrangement, with the dielectric barrier integrated into the connection geometry rather than adding external protective layers, thus minimizing the overall volume increase.
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 ensures a compact, efficient, and cost-effective fluidic connection between tank and external pipes, preventing galvanic corrosion and reducing the risk of water leakage, while allowing for connection of pipes of any shape, including bent pipes.
Implementation Method 1
the washer is made of an electrical insulating material and the nut element is made of the first electrical conductive material... by suitably positioning a single electrical insulating washer between the nut and the external pipe and thus uncouple the nut element from the external pipe, it is ensured that the nut does not contact the external pipe
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The invention relates to a coupling device (1) for fluidically connecting a tank pipe (2) of a tank (8) to an external pipe (9), wherein the tank pipe (2) is made of a first electrical conductive material and the external pipe (9) is made of a second electrical conductive material, the first electrical conductive material being different from the second electrical conductive material, the coupling device (1) comprising: a rotatable nut element (4) for contacting the tank pipe (2); and a washer (6) positionable in contact with the external pipe (9) and between said external pipe (3) and the nut element (4) to uncouple the nut element (4) from the external pipe (3), wherein the washer (6) is made of an electrical insulating material and the nut element (4) is made of the first electrical conductive material.