How is the scope of pressure vessels defined?
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How is the scope of pressure vessels defined?
Fixed and mobile containers for gases, liquefied gases, and liquids whose maximum operating pressure is 0.1 MPa (gauge pressure) or greater, and whose product of pressure and volume is 2.5 MPa·L or greater, and whose maximum operating temperature is equal to or higher than their standard boiling point； Gas cylinders designed for gases, liquefied gases, and liquids with a standard boiling point of 60°C or lower, in which the nominal working pressure is greater than or equal to 0.2 MPa (gauge pressure), and the product of pressure and volume is greater than or equal to 1.0 MPa·L ； Oxygen chambers, etc.
The regulations specify clearly the pressure, volume, medium, etc
AQSIQ Document 2014-114: Pressure vessels refer to closed devices used for holding gases or liquids and subjected to certain pressures. They include fixed and mobile vessels whose maximum operating pressure is 0.1 MPa (gauge pressure) or higher for gases and liquefied gases, and whose maximum operating temperature is equal to or higher than their standard boiling point; such vessels also have a volume of 30 L or more and an inner diameter of 150 mm or more (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section)； Gas cylinders designed for gases, liquefied gases, and liquids with a standard boiling point of 60°C or lower, whose nominal working pressure is 0.2 MPa (gauge pressure) or higher, and whose product of pressure and volume is 1.0 MPa•L or higher ； Oxygen chamber.