Confused about the definition of pressure vessels?
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These regulations apply to pressure vessels that meet the following conditions: (1) The maximum operating pressure is greater than or equal to 0.1 MPa (excluding hydrostatic pressure)； (2) The inner diameter (for non-circular cross-sections, this refers to the largest dimension) is greater than or equal to 0.15 m, and the volume is greater than or equal to 0.025 m3 ； (3) The medium contained is a gas, a liquefied gas, or a liquid whose maximum operating temperature is higher than or equal to its standard boiling point. Article 3: Liquids whose maximum operating temperature is higher than or equal to their standard boiling point. ”What does it mean? I’m confused; if it exceeds the boiling point, shouldn’t it turn into a gas? (Without considering pressure) Thank you
That’s right. If the liquid contained is at or above its boiling point, it will vaporize; once it vaporizes, there is gas present, and with gas being present, there is also gas pressure. Therefore, such containers are also referred to as pressure vessels. If the liquid contained does not vaporize, then it’s a container under normal pressure, as there is only static pressure in such cases, and it isn’t considered a pressure vessel