How is the design pressure of a vessel that operates under a working pressure 0.1 MPa lower than normal determined?
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In our system, there is one container with a capacity of 5 cubic meters and one with a capacity of 3 cubic meters. The normal operating pressure for the 5-cubic-meter container is 5 kPa, while the normal operating pressure for the 3-cubic-meter container is 30 kMPa. How is the design pressure for these two containers determined? How much is each?
When providing design requirements to the equipment team, is it acceptable to specify that the design pressure for these two containers should not be given as a specific value, and instead just indicate that they are \"atmospheric pressure containers\"? For the equipment discipline, the wall thickness of containers should be calculated based on the design pressure value; is it possible to not specify a particular pressure value? Thank you for your reply
This is no longer within the scope of pressure vessels; it’s sufficient for the design pressure to be just higher than the operating pressure
Thank you for your reply! You’re right! The design pressure of the container, with a working pressure of 5 kPa, is set at 10 kPa ； The design pressure of a vessel with a working pressure of 30 kPa is set at 60 kPa. Can a pressure vessel at atmospheric pressure be operated without a safety valve?
I’ve never seen a pressure vessel at normal pressure equipped with a safety valve; check if there are any relevant specifications and standards
For the process equipment data sheet you submit to the equipment department, just write “atmospheric pressure vessel”; they will do the calculations themselves. I don’t seem to see any safety valves set at normal pressure... Everyone can discuss this.
Thank you for the reply! Let’s discuss this in more detail: if “atmospheric pressure vessels” are specified in the technical specifications for the equipment, what pressure should be used when calculating the wall thickness of the vessel?
For atmospheric-pressure vessels, the gauge pressure should be less than 0.1 MPa. Of course, since you are a device, the greatest pressure exerted on it is actually: 0.1 + 0.1 + the hydrostatic pressure. But you actually don’t need to write this in the date sheet. You just need to write down the normal-pressure container; the equipment specialists will handle the calculations.