Distributed Sensor Lines for Moisture Intrusion Detection
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Solution Overview
Problem
Corrosion under insulation in industrial environments, such as oil and gas production plants, is challenging to manage due to unpredictable water ingress and the impracticality of existing moisture sensors for real-time monitoring in process environments.
Innovation Solution
A system utilizing distributed sensor lines along insulation to detect moisture intrusion by measuring differential temperatures across the insulation, enabling continuous and real-time monitoring of potential moisture issues, which reduces the need for frequent inspections and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional point moisture sensors are used, then moisture detection is possible, but they cannot provide guidance on specific areas of concern along sections of insulated pipe
Solution Approach 1:
The patent segments the insulation section into multiple measurement zones by positioning multiple sensor lines at different locations along the pipe. Each sensor line independently measures temperature at its specific location, enabling identification of localized moisture problems rather than providing only an average or single-point reading. This segmentation allows precise spatial mapping of moisture intrusion along the insulated pipe section.
2Reliability
If regular inspection and maintenance is performed by removing insulation, then corrosion under insulation can be detected, but the process is difficult and costly and may require plant shutdown
Solution Approach 1:
The sensor lines are embedded within the insulation layer during installation, allowing the insulation to serve dual purposes: thermal insulation and moisture/corrosion monitoring. The system enables continuous self-monitoring without requiring removal of the insulation, eliminating the need for costly and disruptive manual inspections while maintaining reliable detection capability.
3Measurement precision
If hydrogel-induced micro bending fiber techniques are used, then moisture detection is possible, but the technique is limited to environments where temperatures only rise to approximately 50°C
Solution Approach 1:
The patent replaces the hydrogel-based mechanical sensing mechanism with a distributed temperature sensing system that uses optical fibers to measure temperature profiles. This substitution eliminates the temperature limitation of hydrogel materials, enabling moisture detection in high-temperature industrial environments while maintaining measurement precision through temperature gradient analysis across the insulation.
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 allows for improved risk assessment and reduced maintenance costs by pinpointing moisture intrusion regions, thereby mitigating corrosion under insulation in industrial settings.
Implementation Method 1
the differential temperatures are measures across the insulation between the lines
Implementation Method 2
measuring differential temperatures across the insulation... determination of regional changes in the differential temperatures provides an indication of a potential moisture problem
Data Source
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AI summary
A technique facilitates the detection of moisture. The technique utilizes distributed sensor lines deployed along an insulated vessel, such as an insulated pipe. The sensor lines are used to measure temperature and to determine a differential temperature across the insulation between the sensor lines. Changes in the differential temperature can be detected, and those changes are used to determine whether moisture has intruded into a specific region of the insulation.