Tapered Retaining Tube Plug for Boiler Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plugs for boiler tubes in industrial power boilers are prone to failure due to welding requirements, high maintenance costs, and potential leaks, necessitating a more reliable and cost-effective solution for sealing removed tubes.
Innovation Solution
A one-piece, machined metal retaining tube plug with a tapered tubular shape, lip portion, and serrations for a friction fit, which is expanded in place to form a compression seal without welding, using an expander to ensure a secure and customizable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to secure plugs in boiler tubes, then the plug can be firmly attached, but the process becomes time-consuming and requires certified personnel
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a purely mechanical expansion system. The plug is inserted in a relaxed state and then mechanically expanded using an expander tool that applies radial force to the plug walls, creating a friction fit and mechanical interlock with the tube hole without any welding operations.
Solution Approach 2:
The plug is designed with a tapered geometry that allows it to be inserted in a compressed, smaller-state first, and then expanded in place to the final secured position. This preliminary insertion followed by expansion eliminates the need for complex welding procedures and allows for quicker installation.
2Strength
If welding is used to secure plugs, then strong attachment is achieved, but maintenance costs increase due to required certified personnel
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a purely mechanical expansion system. The plug is inserted in a relaxed state and then mechanically expanded using an expander tool that applies radial force to the plug walls, creating a friction fit and mechanical interlock with the tube hole without any welding operations.
Solution Approach 2:
The plug design includes integrated features such as the tapered geometry and expansion capability that allow it to self-secure within the tube hole. The expansion process causes the plug walls to contact and friction-fit against the hole walls, creating a self-locking mechanism that does not require external welding or specialized certification.
3Reliability
If traditional plugs are used, then sealing is provided, but leaks may occur and reliability decreases
Solution Approach 1:
The patent applies different geometric properties to different parts of the plug: the tapered section provides expansion capability, the expanded portion creates a friction fit and mechanical interlock, and the lip portion provides sealing contact with the tube hole edge. This localized differentiation of geometric qualities ensures both secure attachment and leak prevention.
Solution Approach 2:
The plug incorporates curved and tapered surfaces rather than flat geometries. The tapered walls allow for gradual expansion, while the curved lip portion conforms to the circular tube hole opening, ensuring uniform sealing contact around the entire circumference and preventing leaks.
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 reduces downtime and costs by eliminating the need for welding, providing a secure and customizable seal that withstands steam and water pressure, allowing for quicker and more economical repairs with reduced reliance on certified personnel.
Implementation Method 1
expanded in place to form a compression seal
Implementation Method 2
serrations for a friction fit
Data Source
AI summary
The present invention concerns a boiler tube plug, which is used to plug holes left in drum walls after removal of failed boiler tubes in industrial power boilers, condensers, or heat exchangers. The present invention concerns a new and innovative boiler tube sheet plug for power boilers addressing the needs in the art. The boiler tube plug of the present invention may be used in evaporators, condensers, heat exchangers and other power boilers as appropriate as known in the art.