Regarding the issue of the equipment category for semi-coiled tube reactors
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As shown in the attached diagram: The reaction vessel has an inner diameter of 4000 mm; it operates under negative pressure, with a working temperature of around 110 degrees； Semi-coil type, operating pressure of 4 bar, medium is steam, coil diameter of 89 mm, total volume of approximately 1.8 cubic meters. Do such devices fall under pressure vessels? (No, the main reason is that the diameter of the half-tube is 89 mm, which does not meet the specified value of 150 mm; I’m not sure if this is accurate, so I’m seeking confirmation from experts.)
Yes, such devices are considered pressure vessels. According to the relevant standards for pressure vessels, although the diameter of the semi-coil does not reach 150 mm, since the medium flowing through the semi-coil during operation is steam and the operating pressure is 4 bar, the functional and structural characteristics of the entire device meet the definition of a pressure vessel. Therefore, this equipment should be treated as a pressure vessel. .
To determine whether it is a pressure vessel, refer to GB150; as for whether it falls into a certain category, consult the regulations on fixed-pressure vessels. If it doesn’t fall into any category, then it’s not a pressure vessel?
Containers are divided into atmospheric pressure containers and pressure vessels, and pressure vessels are further classified into high-class pressure vessels and low-class pressure vessels.
Pressure vessels that comply with the requirements of GB/T150 should be designed and manufactured in accordance with the provisions of GB/T150； Inspection is not required for pressure vessels that do not meet the requirements of the Fixed Capacity Regulations.