Dynamic Radiographic Weld Inspection System
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Solution Overview
Problem
Conventional radiographic systems for inspecting welds in vertical storage tanks are limited by the need for static exposures, which are slow, require chemical processing, and cannot keep up with continuous welding processes, leading to delays and increased construction time due to radiation safety restrictions.
Innovation Solution
A dynamic scanning system with a rigidly connected frame and suspension transportation means that allows the radiation source and detector to move in sync along the upper edge of the tank wall, maintaining alignment and stability, enabling continuous inspection without static exposures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static exposure method is used for radiographic inspection, then measurement precision is maintained, but productivity is reduced due to slow inspection speed and chemical processing requirements
Solution Approach 1:
The patent transitions from static film exposure to dynamic digital detection. The detector moves with the welding process, enabling real-time digital capture of weld images without chemical processing. This dynamic approach maintains image quality while dramatically increasing inspection speed and eliminating post-processing delays.
Solution Approach 2:
The patent replaces the mechanical film-based system with a digital detector system. Instead of using physical film that requires chemical development, the system uses digital detectors that immediately convert radiation into electronic images, eliminating the chemical processing step and enabling faster productivity.
2Measurement precision
If multiple consecutive static exposures are used to cover entire weld length, then measurement precision is maintained, but loss of time increases due to repeated positioning and handling
Solution Approach 1:
The patent implements continuous inspection by moving the detector along with the welding process. Instead of stopping for multiple discrete exposures, the system continuously captures weld images throughout the entire welding operation, eliminating positioning time between exposures and maintaining uninterrupted inspection coverage.
Solution Approach 2:
The system is pre-positioned and synchronized with the welding process before inspection begins. The detector is ready to capture images as the welding progresses, eliminating the need for repeated positioning and handling during the inspection process.
3Object-generated harmful factors
If radiation safety restrictions are enforced during static exposure, then object-generated harmful factors are controlled, but productivity is reduced due to construction delays
Solution Approach 1:
The system performs inspection continuously during the welding process itself, rather than requiring separate inspection phases. This integration allows construction to proceed without interruption while maintaining radiation safety through controlled, continuous exposure rather than repeated on/off cycles.
Solution Approach 2:
The digital detector provides immediate feedback on weld quality during the welding process. This real-time information allows for instant adjustments to welding parameters if defects are detected, preventing rework and maintaining construction speed while ensuring quality.
4Measurement precision
If film-based radiography is used, then measurement precision is achieved, but ease of operation is reduced due to chemical processing requirements
Solution Approach 1:
The patent replaces the chemical processing system with a digital electronic system. The detector directly converts radiation into digital images that can be immediately viewed, stored, and analyzed without chemical development, significantly simplifying the operational process while maintaining inspection quality.
Solution Approach 2:
The digital detector system is self-sufficient, automatically converting radiation into usable images without requiring external chemical processing. The system handles the entire inspection process from radiation detection to image generation internally, eliminating the need for separate chemical processing operations.
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
This approach enables faster, more efficient weld inspection that can keep pace with welding progress, reducing construction delays and improving safety by minimizing the radiation exclusion zone, allowing for real-time feedback on weld quality.
Implementation Method 1
a radiation source which is attached to the first sub frame for transmitting electromagnetic radiation towards the weld and a radiation detector which is attached to the second sub frame for detecting radiation which has traveled through the weld
Data Source
AI summary
A system for radiographic inspection of welds from at least a portion of a vertical wall such as the wall of a storage tank for gas or oil wherein the wall comprising a plurality of metal plates connected by means of the welds, the system comprising a frame comprising a first sub frame arranged to be positioned, in use, on a first side of the portion of the wall and a second sub frame arranged to be positioned, in use, on a second side of the portion of the wall which lays opposite to the first side of the portion of the wall. The system comprises a radiation source which is attached to the first sub frame for transmitting electromagnetic radiation towards the weld and a radiation detector which is attached to the second sub frame for detecting radiation which has traveled through the weld for carrying out the inspection.