Microchannel Pressure Vessel Burst Testing for High Temperature MAWP
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Solution Overview
Problem
Existing methods for determining the maximum allowable working pressure (MAWP) of microchannel pressure vessels, particularly those using non-traditional materials and fabrication techniques, fail to account for high temperatures and fabrication-related artifacts, leading to uncertainties in certification compliance.
Innovation Solution
A method involving burst testing, where the device is subjected to controlled temperature and pressure increases above the creep threshold, to determine the MAWP, especially when traditional certification calculations are inapplicable due to non-traditional materials or methods, and potential spurious artifacts are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional certification calculations are used to determine MAWP, then the process is simple and follows established codes, but the results are inaccurate when non-traditional materials, fabrication methods, or high temperatures are involved
Solution Approach 1:
The patent performs preliminary burst testing on representative devices to establish baseline data before conducting formal certification. This preliminary action includes testing devices with intentional fabrication artifacts to understand their impact on MAWP, allowing the development of adjustment factors that simplify subsequent certification processes while maintaining accuracy for non-traditional materials and high-temperature applications
Solution Approach 2:
The patent systematically varies test parameters including temperature (up to 1000°F), pressure (up to 2000 psi), and fabrication methods to determine how these parameters affect MAWP. By establishing relationships between these parameters and MAWP through controlled burst testing, the patent creates a framework that accurately determines MAWP for non-traditional conditions while providing guidance for certification
2Adaptability or versatility
If non-traditional fabrication methods are used, then manufacturing flexibility and adaptability are improved, but certification compliance becomes uncertain due to lack of established procedures
Solution Approach 1:
The patent creates representative burst test devices that replicate the geometry, materials, and fabrication artifacts of actual non-traditional pressure vessels. By testing these representative copies rather than requiring complex analysis of each unique design, the patent provides a reliable certification pathway for non-traditional fabrication methods while maintaining consistency with ASME BPVC requirements
Solution Approach 2:
The patent develops a universal burst testing framework that can accommodate various non-traditional fabrication methods including additive manufacturing, friction stir welding, and hybrid processes. This universal approach allows a single set of test procedures and evaluation criteria to reliably certify diverse fabrication methods, improving both adaptability and certification reliability
3Temperature
If high temperature operation is enabled, then the operational capability and energy efficiency are improved, but material degradation and creep effects increase
Solution Approach 1:
The patent conducts burst testing at multiple discrete temperature intervals (e.g., room temperature, 500°F, 750°F, 1000°F) to establish the relationship between temperature and MAWP. This periodic testing approach captures the degradation behavior at key temperature points, allowing interpolation for intermediate temperatures while ensuring safety margins are maintained throughout the operating range
Solution Approach 2:
The patent replaces traditional room-temperature mechanical property testing with high-temperature burst testing that directly measures the combined effect of temperature and pressure on vessel integrity. By substituting separate material property characterizations with integrated burst testing at operating temperatures, the patent captures creep and thermal degradation effects that cannot be predicted from room-temperature data alone
4Manufacturing precision
If fabrication artifacts are present, then manufacturing realism is improved, but the predictability of MAWP decreases
Solution Approach 1:
The patent performs preliminary burst testing on devices with known fabrication artifacts to establish baseline data and develop adjustment factors. By conducting this preliminary characterization before formal certification, the patent quantifies the impact of artifacts on MAWP and creates correction factors that can be applied to devices with similar artifacts, reducing uncertainty while maintaining manufacturing realism
Solution Approach 2:
The patent uses burst test results from devices with fabrication artifacts to provide feedback on MAWP predictions. By comparing predicted MAWP (based on nominal dimensions and materials) with actual burst pressure, the patent identifies the impact of artifacts and develops adjustment factors that improve prediction accuracy for future devices with similar fabrication processes
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 approach allows for accurate determination of MAWP in microchannel devices operating at high temperatures, ensuring compliance with certification standards by accounting for material properties and fabrication-related factors through representative burst testing.
Implementation Method 1
when higher temperatures are expected, particularly when those higher temperatures may cause significant creep
Data Source
AI summary
A method for determining the maximum allowable working pressure of a microchannel device, particularly a diffusion-bonded, shim-based microchannel device operating at a temperature greater to or equal to a base material threshold temperature where significant creep may predominate, and when employing non-traditional materials of construction, when non-traditional fabrication or joining methods are used, or when spurious artifacts arise.