Are the internal components of pressure vessels considered pressure-bearing elements?
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Do the internal components of pressure vessels belong to pressure-bearing elements? According to the standards, Q235 steel is not allowed to be used in the pressure-bearing components of pressure vessels, but can it be used as a partition inside a pressure vessel?
A partition is acceptable. Do not confuse compressed elements with stressed elements.
The internal components of pressure vessels generally do not belong to the primary pressure-bearing elements, but components such as the heat exchange tubes in heat exchangers are primary pressure-bearing elements. GB150 stipulates that Q235-A steel cannot be used for the main pressure-bearing components of pressure vessels; for partitions inside pressure vessels, Q235-B steel plates are generally sufficient.
Components that are not inside separate chambers are not pressure-bearing components.
The internal components of pressure vessels generally do not belong to the primary pressure-bearing elements, whereas the assembly of the elbow and straight pipe together constitutes a pressure-bearing element. GB150 stipulates that Q235-A steel cannot be used for the pressure-bearing components of pressure vessels. The internal partitions in pressure vessels are certainly not pressure-bearing components, so Q235-A steel plates are generally sufficient; however, Q235-B, Q235-C, and Q235-D can be used for the pressure-bearing components of pressure vessels.
If the partition divides the container into two chambers and the pressure difference between the two chambers is at least 0.1 MPa, it is a non-compressed component for which Q235-A can be used; otherwise it is a compressed component for which Q235-A cannot be used.
Sorry, it should be: “If the partition divides the container into two chambers, and the pressure difference between these two chambers is less than 0.1 MPa, then it is a non-compressed component, and Q235-A can be used; otherwise, it is a compressed component, and Q235-A cannot be used.”
In fact, the materials to be used should be classified according to the different parts of the structure. The so-called pressure-bearing components are those parts that maintain the pressure boundaries; they are subjected to corresponding pressures, which is why the standards impose specific requirements on their selection. Internal components, on the other hand, are designed to meet the requirements of chemical processing processes, so their material selection falls outside the scope of our equipment standards.
I agree with the brother on the 7th floor. If the pressure difference between the two pressure chambers is greater than 0.1, then Q235-A cannot be used.