Introduction of safety valve for liquefied gas storage tank

The main role of the safety valve of the liquefied gas storage tank is that when the pressure of the liquefied gas storage tank rises above the takeoff pressure set in advance by the safety valve, the safety valve will automatically open and release part of the pressure until the storage tank pressure returns to normal The safety valve can be closed by itself.
 
The selection of the safety valve of the LPG tank should be calculated according to the size of the volume to select the appropriate safety valve specification. Its medium is propane, the main component of liquefied petroleum gas.
 
The following introduces the selection and calculation of the safety valve of a LPG storage tank based on an example of a 30-cubic LPG storage tank:
The 1.30 cubic LPG storage tank has a diameter of 2.2 meters. The length of the cylinder is 7.08 meters, and the heads are two oval heads.
2. Latent heat of vaporization of the liquid under the release pressure 262.2kj / kg
3. The release temperature of the release device is 58.7 °C.
4.The rated relief coefficient of the safety valve is 0.65.
5. The overpressure limit of the safety valve is 0.177MPa (the standard stipulates that the overpressure limit cannot generally exceed 10% of the design pressure).
6. The critical pressure of the medium is 4.357MPa.
7. The critical temperature of the medium is 368.8 °C.
8. The safe release volume of a 30 cubic liquefied gas storage tank without thermal insulation is 28877kg / h.
9. The required discharge area of the safety valve of the 30 cubic liquefied gas storage tank is calculated to be 2065mm3.
10. When selecting the safety valve of a 30 cubic liquefied gas storage tank, select a safety valve with a larger discharge area than the area required for calculation.

 

30 cubic liquefied gas storage tank safety valve selection: As liquefied petroleum gas is a compressible liquefied gas, a full-open safety valve should be used. The safety valve should be a safety valve with a nominal diameter of DN100, and its row area is 3318mm3, or two The safety valve with a diameter of DN80 has a single discharge area of 1963mm2 and two discharge areas of 3926mm2.

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