Fiber Optic Sensor Assemblies for Pipeline Leak Detection
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Solution Overview
Problem
Current methods for monitoring pipelines, such as visual inspection and pressure sensors, are resource-intensive, costly, and prone to errors due to environmental exposure and potential failure points. Additionally, existing fiber optic solutions require long, continuous cables that are expensive and susceptible to damage.
Innovation Solution
The use of fiber optic sensor assemblies wrapped around the circumference of pipelines, equipped with optical signal generators, receivers, and transmitters, to monitor for leaks, ruptures, and other events. These assemblies include communications circuitry and a power supply, allowing for remote monitoring and reduced resource requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors are installed inside the pipeline to monitor leaks, then measurement precision is improved, but device complexity and maintenance cost increase due to drilling holes and sealing requirements
Solution Approach 1:
The monitoring function is extracted from inside the pipeline to the outer surface. Fiber optic cables are attached to the external surface of the pipeline, eliminating the need to drill holes and install sensors inside the pipeline. The fiber optic cable detects leaks by measuring changes in acoustic vibrations or stress waves that propagate through the pipeline wall from leak points.
Solution Approach 2:
The fiber optic cable acts as an intermediary between the pipeline interior and the monitoring system. It detects acoustic or mechanical signals generated by leaks through the pipeline wall without direct contact with the fluid, thereby avoiding the need for internal installation while maintaining detection capability.
2Reliability
If a continuous length of fiber optic cable is run down the entire length of the pipeline to monitor leaks, then monitoring coverage is improved, but cost increases due to substantial cable length required
Solution Approach 1:
The continuous monitoring system is segmented into discrete sensor assemblies positioned at specific intervals along the pipeline. Each assembly monitors a localized section, and multiple assemblies provide comprehensive coverage. This eliminates the need for a single continuous cable running the entire pipeline length, reducing material costs while maintaining monitoring effectiveness.
Solution Approach 2:
Instead of uniform continuous coverage, monitoring is concentrated at strategic locations where sensor assemblies are positioned. Each assembly provides high-quality local monitoring of its specific section, and the combination of multiple localized sensors achieves overall system coverage with reduced total cable length.
3Adaptability or versatility
If fiber optic cable is exposed to the environment along the pipeline to enable monitoring, then monitoring capability is improved, but reliability decreases due to susceptibility to environmental damage
Solution Approach 1:
The fiber optic cable is protected by an environmental barrier or encapsulation that shields it from environmental damage while allowing it to remain attached to the pipeline surface. This protective layer prevents exposure to harsh conditions such as moisture, temperature extremes, and physical damage, thereby maintaining cable reliability while preserving monitoring functionality.
4Quantity of substance
If visual inspection is used to monitor pipeline for leaks, then equipment cost is reduced, but productivity decreases due to time-consuming manual inspection
Solution Approach 1:
The fiber optic sensor assemblies provide automated, continuous monitoring of the pipeline without requiring manual inspection. The system self-generates monitoring data by detecting acoustic or mechanical signals from leaks, eliminating the need for periodic visual inspections by personnel while providing ongoing surveillance capability.
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 solution provides a non-intrusive, accurate, and reliable method for pipeline monitoring, reducing maintenance costs and minimizing environmental impact while enabling early detection of leaks and ruptures.
Implementation Method 1
an apparatus attached on one side to the pipeline and on another side to the fiber cable, pushes (based on the strain produced within the pipeline) against the fiber, causing a change in the time an optical signal is received
Data Source
AI summary
Methods and systems to monitor a pipeline for a leak or rupture. An embodiment of the system may include sensor assemblies. Each of the sensor assemblies may include an optical signal generator, an input, an output, and a transmission time circuitry configured to determine a transmission time of the optical signal. The transmission time circuitry may be configured to generate a transmission time data packet including the transmission time. Each of the sensor assemblies may include a fiber optic cable positionable about a circumference of the pipeline and connected to the output and the input. The system may include a controller connected to each of the sensor assemblies and configured to prompt each of the plurality of sensor assembly to generate the optical signal and determine whether the leak or the rupture has occurred based on the transmission time data packet from each of the plurality of sensor assemblies.