Division of pressure-bearing elements in containers
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Regarding the definition of a compressed element, I would like to ask what kind of pressure is meant by “compressed” here? “\"Internal container pressure\" or all other pressures? If it is only internal pressure, should the perforated reinforcement ring not be considered a compression member? If that is all the pressure, then what are the other “non-pressure-bearing components” on the container? The above describes the visual appearance of the “joints between non-pressure components and pressure vessels” as specified in the Code.
The compressed element refers to internal pressure, which is the pressure exerted by the medium. According to the new code, the reinforcement ring is no longer considered a primary compression member. Non-primary stressed components include skirt bases, internals, lugs, etc., which also bear loads.
Pressure vessels: Components that are directly subjected to pressure loads – pressure-bearing elements
The reinforcement rings on pressure vessels are considered pressure-bearing components
The main pressure-bearing components of pressure vessels include the cylinder body, head (end cover), manway cover, manway flange, manway nozzle, expansion joint, and equipment flange； Shell plates of spherical tanks ； Heat exchanger tube sheet and heat exchange tubes ； Main studs of equipment rated M36 and above, as well as pipe fittings and pipe flanges with a nominal diameter of 250 mm or more.
Does the determination of whether a component is under compression also take into account the pressure difference between the internal and external media? For example, in the case of a pipe that extends into the interior of a cylinder, if the pipe is open and connected to the inside of the cylinder, resulting in equal pressure on the inside and outside, does it then not count as a pressurized component? ； Conversely, if the pipeline extending into the interior of the cylinder is sealed, separating it from the cylinder into two chambers, does this pipeline then count as a pressure-bearing element?