Views on whether containers with jackets or coils are considered pressure vessels [a starting point for discussion]

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I have been puzzled for a long time as to whether containers with jackets or coils qualify as pressure vessels. My own opinion is as follows; please point out any conflicts with relevant standards and regulations if there are any. Thank you. To determine whether a pure container qualifies as a pressure vessel, one only needs to refer to the definition of pressure vessels in the catalog of special equipment; there should be no disagreement on this point. Then the container body does not meet the definition of a pressure vessel; does the presence of a jacket or coils make the device considered a pressure vessel? So, it is necessary to check whether the jacket meets the definition of a pressure vessel (common media include steam, and in most cases it meets this definition); the jacket constitutes a pressure vessel. However, since the jacket is an integral part of the equipment, the entire equipment is considered a pressure vessel ； Check whether the coil meets the definition of a pressure vessel (common media include steam, and in most cases it does not meet this definition); therefore, the coil is not considered a pressure vessel. Next, determine whether the coil meets the definition of a pressure pipeline (in many cases it does). However, the coil and the equipment are usually considered as one unit, so the entire equipment is not classified as a pressure vessel. If the coil meets the definition of a pressure pipeline, but it forms part of a larger unit together with the equipment, is the coil then regulated as a pressure pipeline? (I’m not too sure about this.) Just trying to stimulate some discussion