Directional X-ray Source for Pipeline Weld Inspection
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Solution Overview
Problem
Conventional x-ray inspection methods for pipeline girth welds, particularly with real-time radiographic (RTR) detectors, are inefficient on larger diameter pipes due to reduced x-ray flux intensity, making them unacceptably slow and commercially non-viable.
Innovation Solution
A directional x-ray source is used, positioned and rotated coaxially with the pipeline, combined with an externally mounted RTR detector system, to maintain constant x-ray intensity and reduce inspection time by eliminating inverse square law flux reduction effects, allowing for rapid inspection of large diameter pipe welds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a panoramic x-ray source is used with a pipe center mounted configuration, then the system can inspect most pipe diameters, but the x-ray flux intensity at the weld decreases significantly for medium to large diameter pipes due to the inverse square law
Solution Approach 1:
The patent applies local quality by positioning the x-ray source close to the weld area rather than at the pipe center, concentrating the x-ray flux intensity specifically at the weld region. This localized positioning ensures high intensity where needed while allowing adaptability to different pipe diameters through adjustable source-to-weld distance.
Solution Approach 2:
The patent transitions from a centralized pipe-mounted configuration to an external pipe surface configuration. By placing the x-ray source on the outer surface of the pipe near the weld and directing it inward, the system eliminates the inverse square law penalty associated with large radial distances in centered configurations.
2Area of stationary object
If RTR detectors are used with increased pipe diameter, then the inspection coverage area increases, but the inspection time increases rapidly due to reduced x-ray flux
Solution Approach 1:
The patent changes the critical parameter of source-to-detector distance by positioning both the x-ray source and RTR detector in close proximity on the external pipe surface. This parameter change maintains high x-ray flux intensity at the detector regardless of pipe diameter, enabling rapid inspection of large diameter pipes without increasing inspection time.
3Illumination intensity
If the x-ray source is positioned closer to the RTR detector, then the x-ray intensity levels at the detector are significantly increased, but the system complexity increases compared to conventional panoramic sources
Solution Approach 1:
The patent merges the x-ray source and RTR detector into a single integrated inspection unit positioned on the external pipe surface. This combination maintains constant distance between source and detector, ensuring high x-ray intensity while simplifying the overall system configuration compared to separate centralized components.
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 significantly increases x-ray intensity at the detector, enabling faster scanning and efficient inspection of large diameter pipe welds, making the process commercially viable by reducing cycle times and eliminating flux reduction issues.
Implementation Method 1
a directional x-ray source, means for inserting the directional x-ray source into a pipeline section and for rotating the directional x-ray source through 360 degrees substantially coaxially with the pipeline section
Implementation Method 2
as the pipe diameter increases, the intensity of x-ray flux at the weld falls off in accordance with the inverse square law as distance from the x-ray source increases
Data Source
AI summary
An apparatus is provided for x-ray inspection of a pipeline girth weld. This comprises a directional x-ray source 5 which is insertable into a pipeline section and is rotatable within the pipeline. Means are provided to align the directional x-ray source with an external x-ray detector such that both may be rotated through 360 degrees substantially coaxially with the pipeline section. Means for sampling the data detected by the x-ray detector are provided so that it may be further analyzed.