Regarding the definition scope of pressure vessels
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There are two versions that define the scope of pressure vessels: GB150 and TSG21. The difference lies in \"unstressed components that are directly connected to the vessel, such as supports and skirts.\" GB150 classifies them as part of the vessel, whereas the Large Vessel Code does not. I wonder how this should be handled in practice? (Should it be classified as a controlled component according to stricter requirements?) ）
This post was last edited by 1990’s Fat Guy on 2019-7-29 at 15:48
The relevant regulations have already made this very clear.
The last edit to this post was made by wanlirn on 2019-7-29 at 17:01. As mentioned in the explanations related to the GB150 1.6.4 standard, there is a slight issue with the standard: the parts that are welded to pressure vessels should be treated in the same way as the vessel itself, while other parts should be treated as ordinary materials
There definitely will be. This is a basic requirement for jurisdiction.
In other words, in practice, supports and skirt bases are within the defined boundaries of the pressure vessel, but theoretically there is no clear specification, right?
Only welded ones are counted; unwelded ones are not. If the support is welded to a backing plate, it is not counted; if there is no backing plate, then it is counted. The same goes for takeover: those that are welded are included, while those connected by flanges are not.
1.6.4 is actually a more detailed description of 1.6.3, and can be regarded as an example.
The poster should pay attention to the wording of the regulatory standards: GB150 specifies the scope applicable to containers, while TSG21 1.6.1 defines the scope applicable to the pressure vessel itself. It can be understood as follows: TSG believes that only the portion subjected to medium pressure and the welds connected to that portion constitute the main body of the pressure vessel. Looking further up, the ranges of pressure vessels defined by the two standards are actually different; TSG21 includes the vessel body, safety accessories, and instruments. GB150 considers this to include: the main body + welds connected to non-compressed components + direct welding supports and skirts + overpressure relief devices ；