Non-Metallic Hydrogen Pipe Permeation Testing With Calibrated Volume
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Solution Overview
Problem
Existing gas permeation and leakage rate testing devices for non-metallic hydrogen transmission pipes face inaccuracies due to difficult volume measurements, particularly in complex pipe structures and deformations, limiting their universal application and accuracy.
Innovation Solution
A gas permeation and leakage rate testing device with a calibration chamber and measuring unit that calculates the volume of the testing chamber based on pressure and temperature changes, allowing for accurate measurement regardless of pipe shape or size, using Equations 2 and 1 to determine permeation and leakage rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional steel pipe is used for hydrogen transmission, then the pipe strength and safety are improved, but the material cost and construction difficulty increase significantly
Solution Approach 1:
The patent changes the material parameter from metal (steel) to non-metallic materials, fundamentally altering the pipe's properties to achieve both cost reduction and hydrogen embrittlement resistance while maintaining adequate strength through proper material selection
Solution Approach 2:
The patent employs composite material structures for non-metallic pipes, combining different material layers or compositions to achieve optimal balance between strength, cost, and hydrogen compatibility
2Ease of manufacture
If non-metallic material is used for hydrogen transmission pipe, then the material cost is reduced and hydrogen embrittlement is avoided, but hydrogen permeation and leakage increase
Solution Approach 1:
The patent modifies the physical and chemical parameters of non-metallic materials through material composition selection, wall thickness optimization, and structural design to reduce hydrogen permeation coefficients while maintaining cost advantages
Solution Approach 2:
The patent uses composite material structures with different layers having varying permeation properties to create a multi-functional pipe wall that simultaneously achieves low cost, high strength, and reduced hydrogen permeation
3Adaptability or versatility
If the testing chamber volume is increased to accommodate various pipe shapes and sizes, then the adaptability is improved, but the volume measurement accuracy decreases due to difficulty in measuring complex shapes
Solution Approach 1:
The patent replaces direct mechanical volume measurement methods with a gas-based measurement system that uses pressure changes and ideal gas law calculations to determine chamber volume, eliminating the need for complex geometric measurements of irregular shapes
Solution Approach 2:
The patent introduces gas as an intermediary medium to indirectly measure the testing chamber volume. By filling the chamber with gas and measuring pressure changes, the volume can be calculated without directly measuring the complex geometry of the chamber or pipe configurations
4Measurement precision
If the testing chamber volume is precisely measured to improve test accuracy, then the measurement precision is improved, but the device complexity increases due to multiple sealing elements and connectors
Solution Approach 1:
The patent substitutes complex mechanical volume measurement methods with a gas-based pressure measurement system, eliminating the need for precise geometric calculations and reducing the impact of sealing element complexities on volume measurement
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 device achieves accurate volume measurement and improved data accuracy for gas permeation and leakage rates by calibrating the testing chamber volume, accommodating various pipe shapes and specifications, and accounting for deformations.
Implementation Method 1
a measuring unit, the measuring unit being configured to measure a pressure and a temperature in the calibration chamber and a pressure and a temperature in the testing chamber
Implementation Method 2
a measuring unit, the measuring unit being configured to measure a pressure and a temperature in the calibration chamber and a pressure and a temperature in the testing chamber
Implementation Method 3
a first gas-filling assembly, the first gas-filling assembly being selectively communicated with the calibration chamber to be adapted to filling a gas into the calibration chamber to a first set pressure
Implementation Method 4
calculate a calculated volume of the testing chamber based on a first pressure and a first temperature in the calibration chamber and a second pressure and a second temperature in the testing chamber
Data Source
AI summary
A gas permeation and leakage rate testing device and method for a non-metallic hydrogen transmission pipe. The device includes: a testing member formed with a testing cavity adapted to placing a to-be-tested pipe, and the testing cavity being formed with a sealed testing chamber after the to-be-tested pipe is placed therein; a calibration chamber selectively communicated with the testing chamber; a first gas-filling assembly selectively communicated with the calibration chamber to be adapted to filling a gas into the calibration chamber to a first set pressure; a measuring unit configured to measure pressures and temperatures in the calibration chamber and the testing chamber, and to calculate a calculated volume of the testing chamber; and a permeation and leakage rate testing unit configured to obtain a pressure change value of the testing chamber in a preset time interval and calculate a gas permeation and leakage rate of the to-be-tested pipe.