Arc-Shaped Substrate Corrosion Simulator for Wet Gas Pipelines
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Solution Overview
Problem
Measuring top-of-line corrosion in wet gas pipelines is technically challenging due to the presence of a thin electrolyte layer from water condensation, which renders most electrochemical measurements impractical.
Innovation Solution
A system comprising an autoclave chamber with a liquid and gas phase simulating wet gas pipeline conditions, an arc-shaped sample substrate mimicking the top of a pipeline, and probes for measuring corrosion rate and pH, along with a sample holder for applying variable stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical measurements such as Linear Polarization Resistance are used to measure corrosion, then corrosion rate can be measured, but the presence of a thin electrolyte layer from water condensation makes these measurements impractical
Solution Approach 1:
The patent extracts the measurement function from the problematic electrochemical probes and transfers it to a corrosion simulator system with controlled electrolyte conditions. By removing the thin electrolyte layer issue through controlled condensation collection and pH measurement, the system enables accurate corrosion rate measurement without relying on traditional electrochemical methods that fail in TLC conditions.
Solution Approach 2:
The patent introduces an intermediary system comprising a corrosion simulator with controlled liquid and gas phases. This intermediary environment allows for the simulation of top-of-line corrosion conditions while providing a controlled medium for measurement. The system uses pH measurement of collected condensate and electrical resistance probing as intermediary measurement methods that work reliably in the simulated TLC environment.
2Reliability
If the sample substrate is placed in the gas phase to simulate top of pipeline conditions, then TLC corrosion can be measured, but the thin electrolyte layer still forms on the substrate surface
Solution Approach 1:
The patent applies local quality by creating different environmental conditions in different regions of the autoclave chamber. The gas phase region maintains TLC conditions with controlled humidity, while the liquid phase region provides a controlled electrolyte environment for measurement. The sample substrate is positioned to experience the gas phase TLC conditions while the system collectively maintains different local qualities to enable both simulation and measurement.
Solution Approach 2:
The patent uses parameter changes by controlling temperature, pressure, and humidity levels in the autoclave chamber to simulate TLC conditions. By adjusting these parameters, the system creates the appropriate condensate formation conditions while maintaining a controlled environment for measurement. The heating element and cooler are used to control temperature gradients that drive controlled condensation.
3Measurement precision
If multiple probes and measurement devices are added to the system, then comprehensive corrosion measurement capability is achieved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the corrosion simulator system to perform multiple functions: it simulates TLC corrosion conditions, collects and measures pH of condensate, measures electrical resistance for corrosion rate determination, and controls temperature and pressure. This multi-functional design consolidates what would otherwise require separate systems into a single integrated platform, reducing overall complexity while maintaining comprehensive measurement 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
The system effectively simulates and measures top-of-line corrosion, allowing for accurate prediction and assessment of material performance under realistic pipeline conditions, including the simulation of both top-of-line and bottom-of-line corrosion.
Implementation Method 1
the presence of a thin layer of electrolyte due to water condensation (driven by temperature variations)
Implementation Method 2
a heating element operatively connected to a lower portion of the autoclave chamber and configured to heat the liquid phase
Implementation Method 3
an electrochemical probe in contact with the liquid phase, wherein the electrical resistance and electrochemical probes are configured to measure a corrosion rate on the surface of the respective probes
Implementation Method 4
a pH meter operatively connected to the condensation collector and configured to measure a pH of the collected condensate
Data Source
AI summary
A system for simulating top-of-line corrosion is provided. The system includes an autoclave chamber having a liquid phase and a gas phase that simulate the conditions of a wet gas pipeline, where the gas phase comprises H2S and CO2. The system also includes an arc-shaped substrate having a curvature that mimics the size and shape of the top of a pipeline of interest. The substrate is held via a holder that applies variable stress to ends of the substrate. The system also includes a cooler that cools the substrate, a heating element the heat a lower portion of the autoclave chamber, a collector that collects condensate from the substrate, and a meter that measures a pH of the collected condensate. The system can further include an electrical resistance probe and electrochemical probe that measure a corrosion rate on the surface of the respective probes.