Pipeline Thermal Contrast Detection for Corrosion Under Insulation
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Solution Overview
Problem
Corrosion under insulation (CUI) in pipelines is difficult to detect due to its hidden nature, leading to potential catastrophic incidents and costly shutdowns, with existing non-destructive testing techniques being inaccurate and time-consuming, especially in elevated and hard-to-access facilities.
Innovation Solution
A method and system that change the steady-state temperature of a pipeline by applying a thermal contrast using a secondary fluid, detecting thermal gradients between the fluid and the insulation or conduit to identify the presence of water or water vapor, which indicates potential CUI, utilizing infrared cameras and machine learning models for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If advanced non-destructive testing techniques such as infrared thermography are used to detect corrosion under insulation, then the detection capability is improved, but the accuracy is insufficient due to false positives and false negatives caused by large numbers of variables
Solution Approach 1:
The patent applies parameter changes by introducing a thermal contrast agent (fluid at a different temperature) to modify the thermal parameters of the pipeline system. This creates a detectable thermal gradient that enhances the differentiation between corrosion and normal insulation conditions, thereby improving measurement precision while maintaining detection capability
Solution Approach 2:
The patent uses an intermediary substance (thermal contrast agent) that is introduced into the pipeline to mediate the detection process. This intermediary creates a thermal signal that amplifies the contrast between corroded and non-corroded areas, allowing infrared thermography to achieve higher accuracy by detecting the thermal gradient caused by the contrast agent rather than relying on subtle temperature differences alone
2Measurement precision
If exposure of the metal pipe is performed to detect corrosion, then the detection accuracy is improved, but the process becomes time-consuming and costly
Solution Approach 1:
The patent extracts the essential detection function from the time-consuming exposure process by using infrared thermography with thermal contrast agents. This allows the detection of thermal gradients through the insulation without removing it, thereby maintaining detection accuracy while eliminating the need for time-consuming and costly pipe exposure
Solution Approach 2:
The patent replaces the mechanical process of exposing pipes (physical removal of insulation) with a thermal field-based detection method. By introducing thermal contrast agents and using infrared sensing, the system achieves accurate corrosion detection through the insulation without mechanical intervention, significantly reducing inspection time and cost
3Area of stationary object
If scaffolding is used for visual inspection of elevated pipes, then the inspection coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical scaffolding infrastructure with a thermal field-based detection system. Infrared cameras and thermal contrast agents enable inspection of elevated pipes from a distance through thermal gradient detection, eliminating the need for complex scaffolding structures while maintaining comprehensive inspection coverage
Solution Approach 2:
The thermal contrast agent method provides a universal inspection technique that can be applied to pipes at various elevations and locations without requiring location-specific infrastructure like scaffolding. The same thermal detection principle works for both ground-level and elevated pipes, simplifying the overall inspection system
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 minimizes data acquisition time, enhances inspection speed, and provides flexible inspection times, allowing for early detection of CUI without the need for extensive exposure or scaffolding, thereby reducing costs and ensuring facility safety.
Implementation Method 1
changing the steady-state temperature of the first fluid by circulating the second fluid from a bypass conduit through an outlet of the bypass conduit that is positioned in the layer of insulation, the second fluid at a temperature different than the steady-state temperature; and changing the steady-state temperature through heat transfer between the first fluid and the second fluid
Implementation Method 2
detecting a thermal gradient between the first fluid carried in the bore and at least one of the tubular conduit or the layer of insulation at a particular location of the pipeline
Data Source
AI summary
Techniques for determining a thermal condition of a pipeline include identifying a pipeline that carries a fluid at a steady-state temperature, where the pipeline includes a tubular conduit that includes a bore that carries the fluid, and a layer of insulation installed over an exterior surface of the tubular conduit; changing the steady-state temperature of the fluid by applying a thermal contrast to the pipeline; based on changing the steady-state temperature, detecting a thermal gradient between the fluid carried in the bore and at least one of the tubular conduit or the layer of insulation at a particular location of the pipeline; and based on the detected thermal gradient, determining a presence of at least one of water or water vapor between the exterior surface of the tubular conduit and the layer of insulation at the particular location of the pipeline.