What conditions must be met for a simple pressure vessel?

(a) Packagings consisting of a cylinder, a flat head, a convex head (without a spherical crown) or two convex heads.

Cylinder, cylinder head and nozzle and other major pressure parts of the material for carbon steel and austenitic stainless steel;.

Design pressure is less than or equal to 1.6Mpa.

The volume is less than or equal to 1000L.

The product of working pressure and volume is more than or equal to 2.5MPa-L and less than or equal to 1000MPa-L.

The medium is water vapor evaporated from air, nitrogen and medicinal distilled water.

Design temperature is greater than or equal to -20 ℃, the maximum operating temperature is less than or equal to 150 ℃; ⑧ not directly welded containers with flame.

Not directly weld the container with flame.