Pipe-in-Pipe Coupling Using Quick-Set Mortar for High-Temperature Joints
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Solution Overview
Problem
Current coupling methods for pipe-in-pipe pipelines face challenges with resistance to high temperatures, mechanical inefficiency due to material shrinkage, and poor adhesion, which affect the durability and mechanical constraints of the pipeline junctions.
Innovation Solution
A coupling system utilizing a quick-set mortar based on aluminous cement and sand, with a specific composition, is used to fill the space between the sleeve and the pipeline. This mortar provides excellent resistance to high temperatures, maintains mechanical properties, and does not shrink during setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyurethane resin is used as hardenable filling material, then ease of manufacture and adhesion are improved, but resistance to high temperatures deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the hardening material from polyurethane resin to aluminous cement-based mortar, which fundamentally alters the material's temperature resistance properties while maintaining workability through controlled setting time parameters
Solution Approach 2:
The patent uses a composite material system consisting of aluminous cement, sand, and water, creating a composite mortar that combines the high-temperature resistance of cement with the workability benefits of a pourable mixture, resolving the contradiction between ease of manufacture and temperature resistance
2Temperature
If di-polycyclopentadiene (DPCD) is used as hardening material, then resistance to high temperatures is improved, but mechanical efficiency deteriorates due to shrinkage
Solution Approach 1:
The patent changes the material composition from DPCD to aluminous cement-based mortar, which has fundamentally different shrinkage characteristics. The cement mortar maintains dimensional stability during hardening, preventing the mechanical efficiency loss that occurs with DPCD shrinkage while retaining high-temperature resistance
3Reliability
If quick-set mortar based on aluminous cement and sand is used, then resistance to high temperatures and mechanical properties are improved, but setting time increases
Solution Approach 1:
The patent uses a quick-set mortar formulation that provides partial acceleration of the setting process through chemical additives, achieving sufficiently rapid setting for practical purposes while maintaining the high durability and temperature resistance of aluminous cement, without requiring complete elimination of setting time
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 proposed solution enhances the mechanical efficiency and durability of pipeline junctions by maintaining mechanical properties and resistance to high temperatures, thereby improving the flexural resistance and fatigue life of the pipeline.
Implementation Method 1
A coupling system utilizing a quick-set mortar based on aluminous cement and sand, with a specific composition, is used to fill the space between the sleeve and the pipeline
Implementation Method 2
This mortar provides excellent resistance to high temperatures, maintains mechanical properties, and does not shrink during setting
Data Source
AI summary
A coupling for pipe-in-pipe pipeline tubing formed of an assembly of sections each incorporating an inner pipe and an outer pipe butt-welded to the inner pipe, two successive sections being joined together by the welding of respective inner pipes delimiting a segment of inner pipe. The coupling is formed by a sleeve arranged perpendicularly to the segment and a filler material constituted by a quick-set mortar based on aluminous cement and sand, the filler material being arranged in the free space delimited by the sleeve, the segment and the outer pipes of two successive sections.