Rectangular Waveform Current Generator for Pipeline Inspection
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Solution Overview
Problem
Current electromagnetic inspection methods for hydrocarbon pipelines are limited by their reliance on resistivity of the medium, require prior knowledge of pipeline position, and provide only qualitative information, making them ineffective for deep or interconnected pipelines and areas with congestion.
Innovation Solution
A high-powered current generator producing a stabilized AC with a rectangular waveform, featuring a programmable regulated voltage power source, electrical ground reference decoupling, H-Bridge inverter, feedback, and control modules, allowing for quantitative assessment of pipeline coating condition by generating electromagnetic fields and compensating for environmental variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electromagnetic inspection methods are used, then the inspection can be performed on pipelines, but the depth and length capabilities are limited and only qualitative information is provided
Solution Approach 1:
The patent applies parameter changes by transforming the electrical signal characteristics - using a rectangular waveform instead of conventional sinusoidal signals, and operating at stabilized frequencies (e.g., 60 Hz) to enable quantitative measurements. The rectangular waveform provides sharper transitions that enhance detection sensitivity and enable precise coating resistance measurements, directly addressing the limitation of qualitative-only information from conventional methods.
Solution Approach 2:
The patent implements feedback through stabilized frequency control and regulated power supply systems that continuously monitor and adjust the generator output. This feedback mechanism ensures consistent electromagnetic field strength and frequency stability, which is essential for obtaining repeatable quantitative measurements of coating conditions across different pipeline depths and lengths.
2Length of stationary object
If high powered current generator is used, then extended depth and length inspection capabilities are achieved, but the device complexity and power requirements increase
Solution Approach 1:
The patent employs periodic action by operating the generator at stabilized alternating current frequencies (e.g., 60 Hz) rather than direct current. This periodic electromagnetic excitation creates time-varying fields that penetrate deeper into the ground and along the pipeline, enabling extended inspection depths and lengths. The alternating nature of the signal allows for better signal-to-noise ratio and enables the use of frequency-domain analysis techniques.
Solution Approach 2:
The patent applies dynamics through the use of adjustable frequency and amplitude control in the generator. The system can dynamically adapt the electromagnetic field parameters based on the specific inspection requirements, pipeline characteristics, and environmental conditions. This dynamic control allows optimization of the balance between inspection depth/length and power consumption for different operational scenarios.
3Reliability
If environmental variations are present, then inspection conditions become challenging, but temperature compensation systems can maintain stability
Solution Approach 1:
The patent implements temperature compensation through feedback mechanisms that monitor environmental conditions and automatically adjust the generator operating parameters. Temperature sensors and other environmental monitors provide real-time data to the control system, which then modifies frequency, amplitude, or other parameters to maintain consistent measurement conditions despite environmental variations, ensuring reliable inspection results.
Solution Approach 2:
The patent uses parameter changes for environmental compensation by adjusting the electromagnetic field characteristics based on measured environmental conditions. When temperature or other environmental parameters change, the system modifies operating parameters such as frequency or power level to compensate for the effects of environmental variations, maintaining measurement stability and reliability across different inspection conditions.
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
Enables efficient inspection of pipelines up to 70°C, with extended depth and length capabilities, providing quantitative data on coating condition and operational security, suitable for various environmental conditions and applicable to other geophysical studies.
Implementation Method 1
high powered generator used to produce an electromagnetic field along hydrocarbon pipelines from a stabilized AC with a rectangular waveform
Data Source
AI summary
A high powered current generator for electromagnetic inspection of hydrocarbon pipelines from an AC stabilized with rectangular waveform and whose measurements and interpretation are used for evaluating the condition of the lining of the pipelines of five main modules: self-programmable regulated voltage power source module; power source reference decoupling module; H Bridge inverter module; feedback module, and control and processing module. The generator was specifically designed as part of the instrumentation of (TIEMS); which supplies an electric current in the pipeline to produce electromagnetic radiation along the hydrocarbon pipeline. This energy is detected by antennas for obtaining the location of the pipeline and the electric current flowing therein. The generator produces an alternating current at a frequency that can be set within the range of 0.1 Hz to 1 KHz. However, to simplify the job of the operating personnel, default values of 0.1, 0.2, 0.05, 1, 2, 4, 8, 98, 512 and 625 Hertz were established. The current value can also be programmed within the range of 0.1 A to 4.5 A. In order to facilitate the work of the operators, a set of fixed current values 0.100, 0.250, 0.500, 1.0, 1.5, 2.0, 2.5, 3, 3.5, 4.0 and 4.5 Amperes was established.