In a container, is the static pressure of the liquid included in the design pressure?
Thread Content
According to HG20570.1, the design pressure is based on the maximum operating pressure occurring at the top of the vessel. I would like to ask whether the hydrostatic pressure of the liquid in that container should be included in the design pressure? For example, if the container is a device with an open top to the atmosphere and the water level inside it is 5 meters high, then is this device considered a container at atmospheric pressure, or is its design pressure set at atmospheric pressure plus 0.5 barg? The question might seem a bit silly, but such situations arise in practical work. The inquiry letter from a large engineering company was worded in this way, including hydrostatic pressure as well. I earnestly ask for your guidance, brothers and sisters.
The design pressure for pressure vessels at normal pressure is the ambient pressure; the determination of the design pressure for such equipment can be found on page 3-33 of the second volume of the \"Chemical Process Design Manual\"
The static pressure in a pressure vessel at atmospheric pressure has no impact on the vessel’s operation under normal conditions. The liquid level and the density of the liquid generate static pressure that affects the thickness of the bottom and side plates; foot bolts, if present, can also have an effect (on stability).
Regulations on the Safety Technical Inspection of Pressure Vessels, No. Guo Fa 154 issued by the Quality and Technical Supervision Bureau. Article 2: The scope of application of these regulations is as follows: 1. These regulations apply to pressure vessels that meet all of the following conditions: (1) The maximum operating pressure (Pw) (Note 1) is greater than or equal to 0.1 Mpa (excluding hydrostatic pressure; the same applies hereafter)