Dual Chamber Copper Strip Corrosion Test Apparatus
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Solution Overview
Problem
Current methods for testing high vapor pressure hydrocarbon products for corrosive contaminants, such as ASTM D-1838, pose safety and environmental risks due to the immediate venting of hydrocarbons into the atmosphere, which can lead to overpressuring and exposure to hazardous gases near ignition sources or personnel.
Innovation Solution
A dual chamber test apparatus with an isolation valve allows for the expansion of the hydrocarbon sample into a secondary chamber during testing, preventing overpressuring and venting into the atmosphere, and enabling safe handling of vapors through a purge valve connected to a vapor recovery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the hydrocarbon sample is vented to the atmosphere to prevent overpressuring, then the pressure safety is improved, but environmental pollution and safety hazards near ignition sources worsen
Solution Approach 1:
The test apparatus is divided into two separate chambers: a first chamber for sample collection and a second chamber for vapor expansion. This segmentation allows the sample to expand into the second chamber rather than venting to the atmosphere, thus maintaining pressure safety while eliminating environmental pollution and safety hazards near ignition sources
Solution Approach 2:
The second chamber acts as an intermediary space between the sample collection chamber and the atmosphere. Instead of directly venting hydrocarbons to the atmosphere, the system uses the second chamber as a buffer zone that accommodates vapor expansion, thereby preventing both overpressuring and atmospheric contamination
2Device complexity
If the sample is contained in a single chamber to simplify the apparatus, then the device complexity is reduced, but the ability to handle thermal expansion and prevent overpressuring worsens
Solution Approach 1:
Rather than using a single large chamber, the system segments the volume into two chambers connected by a valve. This approach maintains relatively simple individual chamber structures while collectively providing the necessary volume for thermal expansion, thus balancing device simplicity with functional capability
Solution Approach 2:
The system uses a dynamic valve mechanism that can open or close the connection between chambers based on pressure conditions. When pressure builds up due to thermal expansion, the valve allows expansion into the second chamber, providing adaptive pressure management without requiring a permanently complex multi-chamber structure
3Measurement precision
If the isolation valve is closed to isolate the first chamber during sampling, then the sampling accuracy is improved, but the ability to expand sample into the second chamber worsens
Solution Approach 1:
The isolation valve is designed as a dynamic component that transitions from a closed state during sampling (ensuring accuracy) to an open state during expansion (enabling operation). This dynamic operation allows the system to achieve both sampling precision and expansion capability through a simple valve actation sequence
Solution Approach 2:
The system performs preliminary isolation of the first chamber during sampling to ensure accurate sample collection. After sampling is complete, the valve is opened to allow expansion. This preliminary action of closing the valve during sampling ensures that sampling accuracy is maintained without permanently preventing expansion 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 dual chamber apparatus prevents overpressuring and environmental hazards by containing vapor expansion and allowing safe venting post-testing, enhancing worker safety and reducing environmental impact.
Implementation Method 1
The additional volume thus provided allows room for thermal expansion should the sample apparatus be warmed during the testing process
Data Source
AI summary
An apparatus and method for copper strip corrosion testing of high vapor pressure hydrocarbon products using a dual test chamber system to provide over pressure protection to the chambers and containment of the liquid and vapor being tested.