Pipe Clamp Assembly With Sacrificial Insert Against Crevice Corrosion
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Solution Overview
Problem
Conventional pipe clamps can cause crevice corrosion on pipes due to contact with external moisture and oxygen, leading to hidden damage and potential leaks, especially in marine environments where pipes extend underground.
Innovation Solution
A clamp design featuring a crevice corrosion prevention member made of an aluminum alloy with an oxide film, surrounded by a body with stepped portions that support the prevention member without exposing it to the outside, minimizing contact with moisture and oxygen, and a coating layer on the pipe to prevent corrosion products from forming inside the clamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clamp has a large contact area with the pipe to improve supporting force, then the supporting force is improved, but crevice corrosion occurs on the pipe surface due to moisture and oxygen trapped in gaps
Solution Approach 1:
A crevice corrosion prevention member made of aluminum alloy with oxide film is introduced as an intermediary between the clamp body and the pipe. This mediator provides the necessary supporting force while its oxide film prevents crevice corrosion by blocking the electrochemical corrosion process that would otherwise occur in the gap between the clamp and pipe
Solution Approach 2:
The clamp system uses composite material structure combining the clamp body (plastic or metal) with the crevice corrosion prevention member (aluminum alloy with oxide film). This composite approach allows the system to simultaneously achieve mechanical support function and corrosion resistance by leveraging the properties of different materials
2Strength
If the clamp is made of metal material to improve strength, then the supporting force is improved, but electrochemical corrosion occurs due to ion concentration difference in gaps
Solution Approach 1:
The crevice corrosion prevention member acts as a sacrificial intermediary that prevents electrochemical corrosion of the pipe. The aluminum alloy with oxide film provides both mechanical support and corrosion protection, eliminating the need for the clamp body to be in direct contact with the pipe surface
Solution Approach 2:
The crevice corrosion prevention member is designed as a consumable component that can be easily replaced. This disposable element protects the expensive pipe from corrosion, and when it degrades, it can be quickly replaced without replacing the entire clamp system or the pipe
3Reliability
If the pipe is made of stainless steel to prevent corrosion, then the corrosion resistance is improved, but crevice corrosion still occurs in gaps due to ion concentration difference
Solution Approach 1:
The crevice corrosion prevention member is positioned as a mediator between the clamp and the stainless steel pipe. Even though the pipe has good corrosion resistance, this intermediary member eliminates the crevice gap entirely, preventing the ion concentration difference that drives crevice corrosion
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
Effectively prevents crevice corrosion by ensuring the crevice corrosion prevention member corrodes before the pipe, maintaining the pipe's structural integrity and operational life, while the coating layer prevents internal corrosion and facilitates detection of crevice corrosion.
Implementation Method 1
crevice corrosion may occur on the outer circumferential surface of the pipe which is brought into contact with the clamp for a pipe. The crevice corrosion is electrochemical corrosion that occurs due to an ion concentration difference caused by aqueous solution flowing into a gap between metals or a gap between a metal and another material.
Implementation Method 2
The crevice corrosion prevention member may contain an aluminum alloy having an oxide film on a surface thereof
Data Source
AI summary
A clamp for a pipe includes: a crevice corrosion-resistant member surrounding the outer surface of the pipe; and a body that is assembled to allow the crevice corrosion-resistant member to be disposed inside thereof and has opening walls formed at both ends thereof, each of the opening walls having an opening hole through which the pipe passes, wherein the crevice corrosion-resistant member is provided to have the same length as a distance between the opening walls, and thus ends of the crevice corrosion-resistant member can be supported by the opening walls, respectively.