Let’s discuss the issue of design pressure for storage tanks
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The design pressure for atmospheric storage tanks shall not exceed 6 KPA. How should this pressure be determined during design? Should the design pressure simply be set at 6 KPA? Will it increase the cost of the storage tank? So what determines the specific design pressure? The vapor pressure of the materials inside? Is it the discharge pressure of the breather valve? Especially for third-party liquid chemical storage companies, since the types of materials stored in the tanks vary greatly and it’s impossible to determine them, how should the design pressure be chosen?
No matter how great the changes, it is necessary to determine the types of materials to be stored. Set the storage temperature and the pressure of the breathing valve; the design pressure just needs to be slightly higher than that of the breathing valve – there are no special requirements. Use the most stringent material as a standard
When considering cost for atmospheric pressure tanks, it is recommended to focus primarily on overall stiffness. If cost is not a concern, it is recommended to use at least 0.1 MPa, taking into account the minimum wall thickness requirement.
The design pressure for atmospheric storage tanks depends on the material being stored, whether nitrogen blanketing is used, and the set pressure of the vent valve. In my experience, the pressures are usually either 2 kPa or 6 kPa. Of course, there are even higher ones, such as 8kPag, 10kPag, etc. Since I am not aware of the specific circumstances of the poster, it is difficult to give advice
Hello from upstairs. We’re concerned about whether a design pressure of 6 kPa directly would increase costs. This is how the design firm approached it for us; if the investment doesn’t increase significantly, then it doesn’t matter if the pressure is a bit higher. Our storage tanks all have internal floating roofs along with nitrogen sealing. Since this is third-party storage, there are only a few types of materials stored, and the tanks are designed for Class A/B materials at a design temperature of 90 degrees. Should we first determine the properties of the materials, check their vapor pressure, and decide on the operating pressure for the vent valves, before determining the design pressure of the tanks?