Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by and is under the jurisdiction of SAC/TC 309 National Technical Committee on Hydrogen Energy of Standardization Administration of China.
Safety test methods for onboard low pressure hydrogen storage devices for small fuel cell vehicles
1 Scope
This standard specifies the safety test conditions and test methods for onboard low pressure hydrogen storage devices for small fuel cell vehicles (hereinafter referred to as low pressure hydrogen storage devices).
This standard is applicable to onboard low pressure hydrogen storage devices for small fuel cell vehicles with internal volume not greater than 3 L, maximum developed pressure not greater than 25 MPa, and working temperature not lower than -40℃ and not higher than 65℃.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3634.1 Hydrogen - Part 1: Industrial hydrogen
GB/T 13310 Electrodynamic vibration generator systems
GB/T 24499 Technology glossary for gaseous hydrogen, hydrogen energy and hydrogen energy system
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 24499 and the following apply.
3.1.1
low pressure hydrogen storage device
hydrogen storage device with the shell made of stainless steel, aluminum alloy or other alloy (or metal) materials, the built-in hydrogen storage alloy as hydrogen storage medium, internal volume not greater than 3 L, maximum developed pressure not greater than 25 MPa, and working temperature not less than -40℃ and not greater than 65℃
3.1.2
maximum developed pressure
maximum gas pressure (gauge pressure) when the low pressure hydrogen storage device reaches equilibrium at the maximum service temperature after the hydrogen storage alloy therein absorbs hydrogen and becomes saturated
3.1.3
allowable stress
maximum principal stress which is allowed to be borne by the wall of the low pressure hydrogen storage device
Note: The allowable stress is the room temperature yield strength (or 0.2% non-proportional elongation strength) of the material of low pressure hydrogen storage device divided by 1.95.
3.1.4
design pressure
maximum pressure (gauge pressure) that is allowed to be borne by the low pressure hydrogen storage device
3.1.5
rated capacity
maximum amount of hydrogen that can be supplied by a low pressure hydrogen storage device under specified conditions
3.1.6
normal service conditions
allowable pressure, temperature, hydrogen flow and quality of the low pressure hydrogen storage device during normal operation, transport and storage
3.1.7
pressure relief device
safety device for releasing internal pressure of low pressure hydrogen storage device in case of overpressure or fire
3.1.8
rated charging pressure
maximum hydrogen charging pressure (gauge pressure) of low pressure hydrogen storage device under specified conditions
3.1.9
burst pressure
maximum pressure (gauge pressure) of low pressure hydrogen storage device during burst test
3.1.10
rupture
structural failure resulting in instantaneous energy release of the low pressure hydrogen storage device
3.2 Symbols
For the purposes of this document, the following symbols apply.
E——the energy of hard steel ball, J;
g——the gravitational acceleration, 9.8 m/s2;
h——the vertical fall height, m;
m——the mass of the hard steel ball, kg;
Pb——the burst pressure, MPa;
Pd——the design pressure, MPa.
4 Test conditions
4.1 General requirements
4.1.1 The activated low pressure hydrogen storage device shall be used for safety test.
4.1.2 Unless otherwise specified, the environmental conditions for safety test of low pressure hydrogen storage devices are as follows: room temperature and test medium temperature are 20 ℃±5 ℃, and the test medium is hydrogen or helium.
4.1.3 Where hydrogen charging is required for carrying out safety test of low pressure hydrogen storage device, the minimum purity of hydrogen shall meet the requirements of industrial hydrogen superior products specified in GB/T 3634.1.
4.2 Test apparatus
The test apparatus shall be inspected as required and qualified. Where a statutory inspection is required, it shall pass the statutory inspection and be within the validity period of the inspection.
4.3 Protective measures
The test institutions shall formulate safety protective measures according to relevant standards and specifications of the nation, and meet the following basic requirements:
a) The lighting, water supply, power supply and gas supply systems at the test site meet the test requirements;
b) The test site is clean and safe, with necessary safety warning signs, and the test area is effectively isolated;
c) The environmental conditions such as temperature, humidity and vibration on the test site can ensure the test to be carried out normally;
d) The test personnel shall equipped with and wear protective articles necessary for test operation and shall abide by the safety operation rules.
5 Test methods
5.1 Air tightness test
5.1.1 Test requirements
5.1.1.1 In the type test, leak detection method using helium mass spectrometer shall be adopted, and 3 low pressure hydrogen storage devices without charging hydrogen shall be used for air tightness test.
5.1.1.2 In the end-of-manufacturing inspection, leak detection method using special liquid leak detector or leak detection method using hydrogen sensor leak detector shall be used for air tightness test.
5.1.2 Test procedures
5.1.2.1 If air tightness test is carried out by leak detection method using helium mass spectrometer, the following test procedures shall be followed:
a) Fill the low pressure hydrogen storage device with helium at room temperature to the maximum developed pressure, and place it in a vacuum box;
b) After connecting the helium mass spectrometer with the vacuum box, vacuumize the vacuum box to make the vacuum degree lower than 2 Pa;
c) Allow it to stand at room temperature for over 30 min, and read the vacuum degree and leakage rate of helium mass spectrometer.
5.1.2.2 If air tightness test is carried out by leak detection method using special liquid leak detector or leak detection method using hydrogen sensor leak detector, the following test procedures shall be followed:
a) Fill the low pressure hydrogen storage device with hydrogen at room temperature to the maximum developed pressure;
b) Under room temperature, use special liquid leak detector or hydrogen sensor leak detector to detect the leakage of the low pressure hydrogen storage device at an intervals of 15 min, with the number of leak detection not less than twice;
c) Observe and record whether there are bubbles generated, the position of bubbles (if any) or the reading of hydrogen sensor leak detector.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Test conditions
5 Test methods
Annex A (Normative) Method for determining increasing trend of measured maximum strain
