Ultrasonic Probe Signal Strength in Flexible Riser Inspection
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Solution Overview
Problem
Existing ultrasonic scanning methods for flexible pipelines face challenges in accurately assessing the condition of the annulus due to low signal strength and quality, particularly when the ultrasonic beam interacts with the complex layered structure of flexible risers, which can lead to reduced fatigue resistance and increased risk of flooding and corrosion.
Innovation Solution
A method and apparatus utilizing a short pulse ultrasonic beam driven at a higher voltage (700V to 1kV) with frequencies of 4 to 6 MHz, combined with a polyvinylidenefluoride (PVDF) probe, to enhance signal strength and quality by matching the natural frequencies of the materials, allowing for improved detection of corrosion and flooding in the annulus of flexible risers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultrasonic scanning methods are used on flexible pipelines, then the scanning process can be performed, but the signal strength and quality are insufficient due to the complex layered structure of flexible risers
Solution Approach 1:
The patent changes the voltage parameter from conventional levels to higher voltage (700V to 1kV) to enhance the ultrasonic beam strength. This parameter change allows the ultrasonic beam to penetrate the complex layered structure of flexible risers more effectively, improving signal strength and measurement precision without requiring changes to the basic scanning device structure.
2Measurement precision
If higher voltage is applied to the ultrasonic probe, then the signal strength improves, but the energy consumption increases
Solution Approach 1:
The patent employs periodic pulsed ultrasonic beams instead of continuous wave transmission. This periodic action allows the system to deliver high voltage energy in short bursts, achieving strong return signals for improved measurement precision while reducing overall energy consumption compared to continuous high-voltage operation.
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
The enhanced ultrasonic scanning method provides a stronger return signal, improving the accuracy of condition assessment for flexible riser integrity, enabling real-time monitoring and early detection of potential failures, thus preventing environmental damage and extending the service life of the pipeline.
Implementation Method 1
driving an ultrasonic probe to fire a short pulse ultrasonic beam at the outer surface of the tubular member and analysing the reflected signals from the tubular member
Implementation Method 2
A method and apparatus utilizing a short pulse ultrasonic beam driven at a higher voltage (700V to 1kV) with frequencies of 4 to 6 MHz, combined with a polyvinylidenefluoride (PVDF) probe
Data Source
AI summary
A method of assessing the condition of a tubular member comprises driving an ultrasonic probe to fire a short pulse ultrasonic beam at the outer surface of the tubular member and analyzing the reflected signals from the tubular member to assess the condition of the tubular member. The apparatus comprises an ultrasonic probe (22), means for driving the probe to fire a short pulse ultrasonic beam at the outer surface of the tubular member and means for converting the reflected ultrasonic beam into image signals which can be analyzed to assess the condition of the tubular member.