Pressure vessel manufacturing license levels are divided into four levels: A, B, C and D. The scope and representative products of pressure vessel manufacturing at each level are:
A, ultra-high pressure vessel, high pressure vessel (A1); The third type of low and medium pressure vessels (A2); Spherical tank welding or spherical shell on site; Plate manufacturing (A3); Non-metallic pressure vessel (A4); Medical oxygen Chamber (A5)
B. Seamless gas cylinder (B1); Welded gas cylinder (B2); Special Gas Cylinder (B3)
C. Railway tank car (C1); Car tank truck or long pipe trailer (C2); Tank Container (C3)
D. Type I pressure vessel (D1); Low and medium pressure vessels of the second type (D2)
Note: The division of the first, second and third types of pressure vessels shall be determined in accordance with the Safety Technical Supervision Regulations of Pressure Vessels.
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