Is a 5L ethylene oxide storage tank considered a pressure vessel?
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Is a 5L ethylene oxide storage tank considered a pressure vessel?； With a total volume of 5L, a diameter of 219*5, and a height of 165, it features upper and lower end caps; the material used is 316, the design pressure is 2 Mpa, and the operating temperature is 20 degrees Celsius. Does this qualify as a pressure vessel?
No, 5L – the volume is too small. We don’t classify it as a pressure vessel in our manufacturing processes; it falls outside that category
It falls under the category of pressure vessels, as ethylene oxide is a gas, and the product of its operating pressure and volume is greater than or equal to 2.5 MPa·L. Pressure vessels that comply with the requirements of 1.4.2 of the Solid Waste Regulations – namely, those with a volume greater than 1 L and less than 25 L – only need to meet the general provisions, as well as the requirements regarding design and manufacturing permits, set out in those regulations. For Class I containers. **No regulation.
I forgot to mention that it is pressurized with nitrogen at 1 Mpa, so ethylene oxide is in a liquid state
The pressure for epoxy isn’t that high, right? According to your calculations, the pressure is 0.5 MPa! The pressure under normal storage isn’t that high!
Under normal circumstances, epoxy is definitely stored in pressure tanks. But your volume is too small too; even a standard cylinder has around 400L! The normal operating pressure for epoxies is around 0.35 as well; therefore, by definition, it cannot meet the requirement of 2.5 MPa·L – it shouldn’t be possible! But it seems that in actual production, it should still be managed as a pressure vessel!