Why is this pressure vessel considered an external device?
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Why is this pressure vessel considered an external device?
A pressure vessel is a device used for storing or transporting high-pressure gases, liquids, or mixtures. According to **relevant regulations and standards, if the operating pressure of a pressure vessel exceeds a certain value (for example, above 2.5 MPa), it is classified as a \"non-conformity device\" and requires special certification and testing before it can be used, in order to ensure its safety and reliability. Therefore, this pressure vessel may be classified as a non-standard device due to its high operating pressure. .
Pressure vessels are classified into simple and categories 1, 2, and 3. Items that do not fall into any category are not included. It is not within the requirements of the tolerance specifications. For example, it may be a pressure vessel at normal pressure, or designed and manufactured as a pressure vessel, but its dimensions, medium, and operating conditions are not within the range specified in the relevant regulations. “\"Outside the category\" is sometimes also referred to on drawings as \"not classifiable\"”
To determine whether it belongs to fixed-pressure vessels, check the scope specified in TSG21
Simply put, those marked as being outside the specified categories are pressure vessels that do not fall into the three standard categories