Nickel-Clad Casing Pipe Joints for Corrosion and Air Sealing
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Solution Overview
Problem
Existing technologies for compressed-air energy-storage systems, particularly in salt-cavern energy-storage wells, face challenges in providing sufficient resistance to oxygen corrosion, salinity corrosion, and maintaining air tightness in pipes, especially with high Cr materials being expensive.
Innovation Solution
The use of a nickel-based alloy, such as Inconel 625, obtained through weld cladding on the inner and outer walls of casing pipes and threaded joints, enhances corrosion resistance and air sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high Cr materials such as 13Cr are used for casing pipes in salt-cavern energy-storage wells, then corrosion resistance and air tightness are improved, but material cost increases significantly
Solution Approach 1:
The patent applies local quality by implementing weld cladding with nickel-based alloy only on the inner wall of the casing pipe where corrosion resistance is most critical, rather than using expensive high Cr materials throughout the entire pipe structure. This localized treatment provides enhanced corrosion resistance at the corrosion-prone interface while maintaining cost-effectiveness for the bulk material.
Solution Approach 2:
The patent employs composite materials by combining the base casing pipe material with a nickel-based alloy cladding layer. The composite structure integrates the mechanical strength of the base material with the superior corrosion resistance of the nickel-based alloy, achieving both performance and cost optimization.
2Reliability
If weld cladding is applied to the inner wall of casing pipes, then corrosion resistance is improved, but ensuring air sealing ability and corrosion resistance after cladding becomes difficult
Solution Approach 1:
The patent applies preliminary action by performing specific preprocessing steps including surface cleaning, roughening treatment, and application of bonding promoters on the inner wall surface before weld cladding. These preliminary actions ensure proper adhesion of the nickel-based alloy cladding to the base material, guaranteeing both corrosion resistance and air sealing integrity after the cladding process.
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 nickel-based alloy cladding significantly improves the corrosion resistance and sealing performance of the casing pipes and threaded joints, addressing the limitations of existing materials and ensuring the longevity and efficiency of compressed-air energy-storage systems.
Implementation Method 1
the inner wall of the casing pipe is covered with nickel-based alloy obtained by weld cladding, and the outer wall at at least one end of the casing pipe is covered with nickel-based alloy obtained by weld cladding
Data Source
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AI summary
The present invention provides a structure with a casing pipe and a threaded joint, wherein it comprises a casing pipe and a threaded joint, the threaded joint is so located as to connect two casing pipes; wherein the inner wall of the casing pipe is covered with nickel-based alloy obtained by weld cladding, and the outer wall at an end of the casing pipe is covered with nickel-based alloy obtained by weld cladding, and the inner wall of the threaded joint is covered with nickel-based alloy obtained by weld cladding. The product of the present invention can meet the anti-corrosion requirements in working environments and the requirements of sealing performance. It solves the problem that some alloy pipes do not have sufficient resistance to corrosion and the cost of Cr-serie pipe is high. It help the high-power compressed-air energy-storage projects to be applied in batches in industry.