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GB 7512-2023 Valves for liquefied petroleum gas cylinders |
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| 1 | 7.7 | Torque wrench+tooling | ||
| 2 | 7.8 | Newly developed test bench (gas pressure, nominal pressure, holding pressure for 1 minute, water immersion) | ||
| 3 | 7.9 | Vibration test bench (single axis) after 30 minutes+gas tightness test bench | ||
| 4 | 7.10 | High and low temperature environmental chamber (high temperature: 60 degree , low temperature: -40 degree ) | High and low temperature environmental chamber+gas tightness test bench | |
| 5 | 7.11 | Test 1: Gas tightness test after completing the opening and closing test under work pressure. Test 2: Gas tightness test after opening and closing durability test of self closing device. | ||
| 6 | 7.12 | Newly developed (water pressure, 5 times nominal pressure, holding pressure for 5 minutes) | ||
| 7 | 7.13 | GB/T 10567.2-2007 Wrought copper and copper alloys-Detection of residual stress-Ammonia test | ||
| 8 | 7.14 | |||
| 9 | 7.15 | 150mm LPG blowpipe flame | GB/T 15382-2009 General specifications of gas cylinder valves 5.6.18 Fire test: The operating mechanism of the sample valve (such as the handwheel) is exposed to a 150mm long LPG blowpipe flame for 1 minute, with a standard temperature between 800 degree and 1000 degree . The operating device should be completely surrounded by flames. Although the handwheel may be damaged after the test, the valve can still be manually closed after cooling. | |
| GB 5842-2023 Liquefied petroleum steel gas cylinders | ||||
| 1 | 9.2.2 |
Water pressure test in accordance with GB/T 9251 Methods for hydrostatic test of gas cylinders. The water pressure test device should be able to automatically record the cylinder number, test time, and test results in real time, and the electronic record of the water pressure test should be kept for at least 8 years. Gas cylinders that cannot trace water pressure test records should not be shipped from the factory. During the water pressure test, the pressure should be slowly increased to 3.2 MPa at a rate of no more than 0.5 MPa per second and maintained for no less than 30 seconds. The gas cylinder should not have macroscopic deformation or leakage, and the pressure gauge should not have visible fall back. |
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| 2 | 9.2.3 | Gas cylinder gas tightness test in accordance with GB/T 12137-2015 Methods for leakage test of gas cylinders. Gas cylinder gas tightness test should be conducted after passing water pressure test, with a pressure of 2.1 MPa. During the test, fill the cylinder with compressed air until the test pressure, then immerse it in water and maintain the pressure for no less than 30 seconds. Check that the cylinder does not have any defects |
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| 3 | 9.3.4 | The actual burst safety factor of the gas cylinder is 3.0, which means that the actual water pressure burst test pressure Pb should not be less than 3 times the nominal working pressure, which is 6.3 MPa. The water pressure burst test shall be in accordance with GB/T 15385-2022 Method for hydraulic burst test of gas cylinder. The water pressure burst test should adopt test device that can automatically collect and record pressure, water inflow, and time, and can draw pressure time and pressure inflow curves. The deformation of the gas cylinder before burst should be uniform, and the volumetric deformation rate during burst (the ratio of the increase in gas cylinder volume during burst to the water volume of the gas cylinder) should not be less than the specified value. | ||
| 4 | 9.4 | The fatigue test in accordance with GB/T {{0}} Method for pressure cycling test of gas cylinders. Install three fatigue test gas cylinders onto the fatigue testing machine, using water as the test medium, with a cycle upper limit pressure of 3.2 MPa and a cycle lower limit pressure of 0.3 MPa. After 12000 cycles of fatigue at a frequency not exceeding 15 times/min, the gas cylinders should be leak free. | ||
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