Friction-Welded Tank Appurtenances Without Ignition Sources
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Solution Overview
Problem
Conventional welding techniques for attaching appurtenances to metal storage tanks pose safety risks due to the use of ignition sources, which can ignite combustible materials, particularly in hazardous environments like petroleum product storage tanks.
Innovation Solution
Friction welding is employed to attach fasteners and appurtenances to storage tanks using friction stud welding, which eliminates the need for ignition sources and allows for bonding in hazardous environments, ensuring compliance with industry standards such as API 650 and 653, ASME Section VIII and IX.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welding techniques are used to attach appurtenances to storage tanks, then structural integrity is achieved, but safety risks increase due to ignition sources in hazardous environments
Solution Approach 1:
The patent replaces conventional welding processes (which use thermal/chemical energy and create ignition sources) with friction welding, a mechanical process that generates heat through direct friction between surfaces. This substitution eliminates the need for external ignition sources like arcs or flames, thereby resolving the contradiction between achieving structural integrity and preventing ignition in hazardous environments
Solution Approach 2:
The invention changes the fundamental parameters of the joining process by transitioning from thermal welding (high temperature, external heat source) to friction welding (controlled friction heat, mechanical energy conversion). This parameter change allows the process to maintain welding-quality structural integrity while eliminating the harmful ignition sources that pose safety risks in hazardous environments
2Object-affected harmful factors
If friction welding is used to attach appurtenances to storage tanks, then safety is improved by eliminating ignition sources, but process complexity increases
Solution Approach 1:
Friction welding is a self-service process where the heat required for welding is generated automatically by the friction between the appurtenance and the tank surface during the joining process itself. This eliminates the need for external heating equipment, complex temperature control systems, and multiple operational steps, thereby reducing overall process complexity while maintaining safety benefits
Solution Approach 2:
The invention extracts and removes the complex thermal management and ignition control systems from conventional welding processes. By using friction-generated heat instead of external heat sources, the process eliminates the need for sophisticated temperature regulation, shielding gas systems, and ignition control mechanisms, thereby simplifying the overall welding system while maintaining safety
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
Friction welding provides a safe and effective method for attaching appurtenances to storage tanks, enhancing structural integrity while minimizing the risk of ignition and ensuring compliance with industry standards, even in hazardous conditions.
Implementation Method 1
Friction welding is employed to attach fasteners and appurtenances to storage tanks using friction stud welding
Data Source
AI summary
Some implementations of ignition-free welding include attaching fasteners to a tank, the tank having a wall, the wall having two parallel surfaces, the fasteners penetrating only one of the parallel surfaces, wherein the tank resides within a vicinity of a hazardous material, includes securing an appurtenance to the tank using the fasteners; and does not include removing the hazardous material.