Compton Scattering Inspection of Composite Repairs
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Solution Overview
Problem
Existing methods for inspecting the integrity of composite wrap repairs on pressurized piping and pressure vessels are limited, making it difficult to assess the remaining wall thickness and degradation beneath the composite wrap, which hinders informed decision-making and prolongation of the repair's usage.
Innovation Solution
A Compton scattering inspection device is used to emit a beam of radiation particles across the composite repair, detecting backscattered photons to acquire data indicative of the remaining wall thickness, allowing for accurate measurement and assessment of the repair's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composite wrap repair is applied to a degraded metal structure, then the integrity of the asset is improved and further degradation is prevented, but the ability to inspect and quantify degradation beneath the wrap is hindered
Solution Approach 1:
The patent replaces conventional mechanical inspection methods (which cannot penetrate composite wraps) with Compton scattering-based radiation detection. The inspection device emits gamma rays that penetrate the composite wrap material, and detectors measure the scattered photons to determine wall thickness and degradation beneath the wrap, thus substituting mechanical contact methods with non-contact radiation-based measurement.
2Ease of operation
If conventional inspection methods are used on composite wrap repairs, then the inspection process is simple, but accurate measurement of remaining wall thickness and degradation is not achieved
Solution Approach 1:
The patent changes the physical parameters of the inspection approach by using gamma radiation with specific energy levels (e.g., 1.17-1.33 MeV from Co-60 source) that optimize penetration through composite wrap materials while maintaining sufficient scattering signal for detection. The system measures Compton scattering parameters (photon energy, scattering angle) to derive wall thickness information, transforming the inspection from visual/surface-level to subsurface quantitative measurement.
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 method enables precise measurement of the remaining wall thickness and integrity assessment, potentially prolonging the use of composite wrap repairs, reducing shutdowns, and improving maintenance efficiency by providing accurate data on degradation and bond integrity.
Implementation Method 1
operating a Compton scattering inspection device onto the degraded area, including emitting a beam of radiation particles directed towards and across the composite repair, detecting at least some backscattered photons scattered back from the metal structure
Data Source
AI summary
The method of inspecting a degraded area of a metal structure covered by a composite repair generally comprises operating a Compton scattering inspection device onto the degraded area, including emitting a beam of radiation particles directed towards and across the composite repair, detecting at least some backscattered photons scattered back from the metal structure, and acquiring Compton scattering data from the detected backscattered photons, the Compton scattering data being indicative of remaining wall thickness of the degraded area.