As a key component of safety and performance in hydrogen storage systems, hydrogen-related valves play a key role in ensuring the safe storage and efficient release of hydrogen. The ultimate temperature and pressure cycling test of the valve is designed to evaluate the performance of the valve at different temperatures and pressures, which helps to determine the operating characteristics, leakage rate and lifetime performance of the valve under extreme conditions, thus ensuring its reliability in real-world operation.
Test standard requirements
basisGB T 42536-2023 "Vehicle High-pressure Hydrogen Storage Cylinder Combination Valve".6.6.3. Extreme temperature and pressure cycle test, the test method simulates the influence of hydrogen pressure cycle on the sealing, pressure resistance and life of the sample under the working conditions of normal temperature, high temperature +85 and low temperature -40 of hydrogen-related valves
The correspondence between the test parameters and the actual working conditions
The setting of test parameters is used for a large amount of data collection and exploration when formulating the test plan
85 ambient temperature condition
The cabin of a dark-colored vehicle parked on an asphalt road has a maximum temperature of 50 in direct sunlight of 82;
-40 ambient temperature condition
Meteorological records show that countries at high latitudes with extreme temperatures of -40 or below experience low temperatures of -30 and below 5% of the year;
Test pressure conditions
The temperature of the valve will rise rapidly during the rapid filling, and the whole filling process is similar to the adiabatic compression, which is calculated according to the adiabatic compression, when the hydrogen storage remains unchanged, the temperature in the valve will rise from 15 to 85 and the pressure will rise to 125 times the nominal working pressure, in the same way, an increase in the temperature inside the cylinder from -40 to 15 will cause the pressure to change from 08 times the nominal working pressure is increased to 1 times the nominal working pressure.
Determination and analysis of qualified indicators
After the test is completed, the valve shall carry out the following conformity determination:
Leak test
If there is no bubble within the specified test time, the valve passes the test; If bubbles are detected, the leakage rate should be measured using an appropriate method, and the hydrogen leakage rate should not exceed 10ml h;
Pressure resistance test
After 3min of pressure holding, the valve should not rupture. For valves that have been tested in other ways, the measured burst pressure should not be less than 0 of the benchmark burst pressure8 times, or more than 4 times the nominal working pressure p.
In summary, at extreme temperatures, the tightness and operability of the valve are affected, and the expansion of the material at high temperatures and shrinkage at low temperatures may affect the sealing effect of the valve. Verify valve life and durability by simulating extreme temperature and pressure environments under real-world operating conditions, which helps determine valve life and develop maintenance plans. Tehi has the ability to verify and analyze hydrogen-related valves that meet the requirements of the standard, and has become a partner to help more hydrogen energy customers grow, and escort the safety and stability of hydrogen storage systems.
Workshop registration
Hydrogen partners:
Tehi Hydrogen Energy Testing will be held inFrom March 20th to March 21st, the "Safety and Reliability Design and Fault Library Sharing Workshop for High-pressure Hydrogen Storage System" was held。The workshop will invite the first batch of senior engineers, registered safety engineers, and practical experts engaged in hydrogen energy testing and evaluation in China to discuss the issues of concern to everyone2 days of professional training, answers and communication.
(Detailed course schedule).
How to register
Pay attention to Baijiahao's "Tehi Hydrogen Energy Testing".
Reply"Registration".
You can register according to the background prompts.