Discussion on Calculation Method and Influencing Factors of Overpressure Relief of Compressed Gas Cylinders
Determining the safety relief capacity and relief area is the key to designing the overpressure relief of gas cylinders.Based on the CGA-1.1-2019"Pressure Relief Device Standards—Part 1-Cylindersfor Compressed Gases"standard,the calculations of safety relief capacity and relief area of compressed gas cylinders were discussed.The influencing factors and laws affecting the relief area were clarified.The possible ways to reduce the relief area of gas cylinders were analyzed.The results show that the calculation method of safety relief capacity derived from CGA S-1.1-2019 is different from the calculation method given in GB/T 33215-2016"Pressure Relief Devices for Gas Cylinders".The factors that affect the relief diameter of gas cylinders include the cylinder volume,the relief coefficient of the overpressure relief device,and the relief temperature.The cylinder volume has a significant effect on the relief diameter,the effect of the relief temperature on the relief diameter can be ignored.For gas cylinders of any fixed volume,when the relief coefficient increases from 0.63 to 1,the reduction rate of the relief diameter is 20.6％.For gas cylinders with certain volume,using the relief device with higher relief coefficient and verifying the relief capacity through fire test are two possible ways to reduce the relief diameter of gas cylinders.
cylindercompressed gasoverpressuresafety relief capacityrelief area
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