Understanding of the tolerance specification: “Non-circular cross-section refers to the maximum geometric dimension of the inner boundary of the cross-section”?
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Understanding of the tolerance specification: “Non-circular cross-section refers to the maximum geometric dimension of the inner boundary of the cross-section”? The definition of pressure vessels in the regulatory standards specifies limits on pressure in clause 1 ； Article 2 sets limits on the structural dimensions ； Article 3 imposes restrictions on the medium. Well, the second requirement states that the inner diameter must be ≥150 mm. Regarding the phrase \"non-circular cross-section refers to the maximum geometric dimension of the internal boundaries of the cross-section,\" for a reactor equipped with a jacket, if it is classified as a multi-chamber pressure vessel, then the 150 mm requirement likely refers to the width of the jacket, that is, the gap between the inner tank and the outer tank. This gap generally does not reach 150 mm (for a 10,000 L jacketed reactor, this gap is around 100 mm). Therefore, since this requirement is not met, it can be determined that such a device does not qualify as a pressure vessel. It is also necessary to consider whether steam or heat transfer oil is used in the jacket Is it not needed anymore? Some design institutes and manufacturing plants may believe that a vessel with a jacket through which steam is passed falls under the category of Class II pressure vessels, while one with a jacket through which heat transfer oil is passed does not qualify as a pressure vessel. Does this view truly conform to the intent of the pressure vessel regulations?
Firstly, “non-circular cross-section refers to the maximum geometric dimension of the inner boundary of the cross-section,” which denotes the largest dimension of the parts inside a pressure vessel that are not circular in shape, such as square or rectangular cross-sections. This restriction is in place to prevent deformation of the parts with non-circular cross-sections under compression, which could lead to safety accidents. Regarding the understanding of the second requirement that the inner diameter should be ≥150 mm, it indeed means that the inner diameter of the pressure vessel must be greater than or equal to 150 mm. As for reactors with jackets, if their inner diameter meets the requirements, they can be classified as pressure vessels. The medium fed into the jacket (steam or heat transfer oil) does not affect this classification. It should be noted that the classification criteria for pressure vessels also include many other factors, such as maximum operating pressure, material strength, operating environment, and so on. Therefore, for the design and manufacture of pressure vessels, strict calculations and inspections must be carried out in accordance with standards and specifications to ensure their safety and reliability. .
1. As you yourself said, a reactor with a jacket is a tube wrapped around another tube, that is, a larger tube enclosing a smaller one. Since there are large and small ones, the larger ones naturally have their own diameter. 2. The highest category of each pressure chamber shall be used as the category for that multi-chamber pressure vessel, and management shall be carried out in accordance with this category; however, design and manufacturing technical requirements shall be specified separately based on the respective categories of each pressure chamber. 3. Do not misunderstand others’ categorization.
The cross-section of this jacket cavity is ring-shaped, rather than circular
The original poster really knows how to consider things from a perspective that benefits themselves and engage in argumentation
It’s not meant to be argumentative; it’s just a deep misunderstanding.
I really dislike people who constantly mock and tease others, acting as if they know everything from birth. When someone raises a question, if you want to participate in the discussion, then respond; if you think the question is too simple, just ignore it. Instead of that, they keep attacking others, showing typical behavior of keyboard warriors. OP, let me ask you a question: when calculating the wall thickness of your outer jacket, which diameter do you use? And then think about why there is a limit on the specified diameter In fact, it is the smaller diameter that determines the level of hazard and impact
I'm just telling the truth. The poster is likely not involved in the design or manufacturing of containers; rather, he is probably a manager at an organization that uses such containers. He raised this question simply to find ways to avoid complying with the \"Fixed Container Regulations\" and thus skip the registration and annual inspection procedures ； So his way of understanding regulations is to interpret them in a way that is favorable to himself. Only the original poster can understand the maximum cross-sectional size as the maximum gap.
During design, the wall thickness of the jacket is calculated based on the jacket diameter; it can be said that such a design approach inherently raises the requirements
The original poster must have misunderstood; the jacket is also a cavity. If you unfold the ring, isn’t it just a rectangle? So his diagonal is the maximum geometric dimension. The same principle applies to shell-and-tube heat exchangers as well. . .