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Pressure vessel, refers to the gas or liquid, carrying a certain pressure of the closed equipment. The provisions scope of the maximum working pressure greater than or equal to 0.1MPa (gauge pressure). It is a fixed or mobile container holding liquefied gas or gas with its product of pressure and volume over or equal to 2.5MPa·L, and holding a liquid having a maximum operating temperature higher than or equal to the standard boiling point; or it is a gas cylinder or oxygen cabin with nominal working pressure over or equal to 0.2MPa (gauge pressure), carrying liquefied gas or gas with its product of pressure and volume over or equal to 1.0MPa·L, or carrying liquid with the standard boiling point equal to or below 60℃.
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