Is the spherical tank safe?
Thread Content
The design pressure of the spherical tank is 0.4 MPa (g); it is used to store Class A/B materials, with a saturated vapor pressure at 40°C of 0.121 MPa (a). The pressure at the outlet of the unit is 0.6 MPa (g), and the temperature is 40°C. Under these conditions, will there be a liquid column inside the spherical tank? Will there be intense mixing of the liquids? Is the spherical tank safe?
How do you guarantee 40 degrees? Is it heating?
1. Spherical tanks are used for storing Class A and B media, and they are relatively safe; at least overpressure problems are less likely to occur. 2. Spherical tanks generally have feeding at the bottom; I’ve never heard of any issues with liquid columns ； 3. The pressure at the edge of the device is calculated based on the pressure behind it. If the subsequent pressure drop is not so large, the pressure at the interface zone will not rise to such a high level. Overall, this design is safe and reasonable
Additional note: However, necessary safety measures for the spherical tank are essential, such as safety valves
Firstly, the pressure in the area outside the device is not calculated based on my ball tank, as the process determines the requirements first and the type of tank is chosen later for storage and transportation; I’m not sure what pressure he used for the calculation. Secondly, considering the pressure in the out-of-bounds area and the storage condition of the spherical tank, at 40°C, the remaining head pressure at the bottom feed inlet should be at least 0.4 MPa. In this case, when liquid is introduced into the tank, will there be intense mixing of the liquid inside the tank?
Understood. This is the normal process, but the pressure and temperature actually delivered from the upstream side will be slightly lower. Due to the large volume of the storage tank, there will be no significant impact. As for the vigorous mixing of liquids? I don’t know what you mean by that expression. Rolling?
It’s the centrifugal pump that’s being used, right? The pressure required in the process is quite high; if the pipeline system doesn’t present too much resistance, the pump will automatically adjust itself to increase the flow rate, and there won’t be any issues related to the liquid column.
It’s rolling – will this result in a large amount of static electricity being generated?
The temperature difference inside the spherical tank is small, so stratification generally does not occur, and thus rolling does not take place. Even if rolling occurs and a large amount of vapor is generated, the impact on the pressure of the spherical tank will not be significant ； Even if pressure increases rapidly, it can be released through a safety valve for protection.