Ultrasonic Pipe Inspection Sensor Assembly
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Solution Overview
Problem
Current methods for detecting corrosion and scale buildup in pipes, especially finned tubes, are inadequate as they often rely on external electromagnetic sensors that can be affected by ferromagnetic fins and fail to accurately assess internal and external surfaces simultaneously.
Innovation Solution
An ultrasonic-based sensor assembly with a tubular housing and evenly distributed ultrasonic elements is deployed inside the pipe to transmit and receive ultrasonic signals, using centering discs for fluid coupling and beam steering to detect corrosion and scale buildup on both internal and external surfaces, including fins, without interference from ferromagnetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic sensors are used for detection, then detection capability is provided, but detection accuracy deteriorates due to interference from ferromagnetic fins
Solution Approach 1:
The patent replaces electromagnetic sensors with ultrasonic sensors that use acoustic waves instead of electromagnetic fields. This substitution eliminates the interference problem caused by ferromagnetic fins, as ultrasonic waves are not affected by magnetic materials. The ultrasonic elements transmit acoustic signals through the pipe wall and detect reflections from corrosion or scale buildup without being disrupted by the ferromagnetic properties of external fins.
2Measurement precision
If external sensors are used for detection, then external surface detection is enabled, but internal surface detection capability is lost
Solution Approach 1:
The patent inverts the conventional approach by placing sensors inside the pipe rather than outside. The ultrasonic elements are positioned within the pipe to transmit signals radially outward through the pipe wall. This internal positioning allows the system to detect both internal corrosion on the inner pipe surface and external corrosion on the outer surface, as well as scale buildup, by analyzing reflected ultrasonic signals from different interfaces within the pipe structure.
3Measurement precision
If ultrasonic elements are placed close to pipe wall, then detection sensitivity improves, but fluid coupling requirement increases complexity
Solution Approach 1:
The patent utilizes the fluid already present in the pipe to provide acoustic coupling between the ultrasonic elements and the pipe wall. The fluid (liquid or gas) serves as the coupling medium, eliminating the need for separate coupling agents or complex mechanical contact systems. The ultrasonic elements transmit signals through the fluid to the pipe wall and receive reflections, with the fluid naturally filling the gap and providing the necessary acoustic impedance matching.
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 enables reliable detection of corrosion, scale buildup, and thermal fatigue within and outside pipes, including fin defects, by generating a time-of-flight curve that accurately represents the presence and location of issues, unaffected by ferromagnetic fins and providing comprehensive pipe integrity assessment.
Implementation Method 1
The ultrasonic elements are configured to transmit ultrasonic signals and sense ultrasonic signals reflected from the internal surface of the pipe to sense corrosion and scale buildup information inside the pipe
Implementation Method 2
The internal fluid channel forms a tubular fluid column of laminar flow that fluidically couples the ultrasonic elements with an internal surface of the pipe
Data Source
AI summary
A sensor assembly communicatively coupled to a processing device is configured to be disposed within and move along a pipe configured to flow a fluid. The sensor assembly includes a tubular housing configured to be centrally retained within the pipe. The tubular housing includes an outer diameter smaller than an internal diameter of the pipe. The sensor assembly also includes a plurality of ultrasonic elements coupled to and distributed evenly along an external surface of the tubular housing to define a gap between an outer surface of the ultrasonic elements and an internal surface of the pipe. The ultrasonic elements are configured to transmit ultrasonic signals and sense ultrasonic signals reflected from the internal surface of the pipe to sense corrosion and scale buildup information inside the pipe. The ultrasonic elements are configured to transmit the information to the processing device.