What pressure vessel is used for?
Dressed than atmospheric pressure of the fluid, such as liquefied gas tank, boiler, oxygen tanks and so on.
Some more things, or atmospheric pressure cannot be saved.
Pressure vessel concept: 1) the work pressure is greater than or equal to 0.1 Mpa; (2) the diameter greater than or equal to 0.15 m. And volume (V) is greater than or equal to 0.025 cubic meters, the product of working pressure and volume greater than or equal to 2.5 MPa - L; (3) loading medium for gas, liquefied gas and highest working temperature is higher than or equal to its standard boiling point of the liquid. Often used in the chemical industry
