How to classify the level of forging license for pressure vessels

How to classify the level of forging license for pressure vessels

The manufacturing license level of pressure vessels is divided into four levels according to the scope of products allowed to be manufactured: A, B, C, and D. Each level is further 

divided into several levels, and the specific division method is as follows:

(1) Grade A: Ultra high pressure vessel, high pressure vessel (A1); Type III low and medium pressure vessels (A2); On site assembly and welding of spherical storage tanks or 

manufacturing of spherical shell plates (A3); Non metallic pressure vessels (A4); Medical oxygen chamber (A5).

(2) B-class: Seamless gas cylinder (B1); Welding gas cylinder (B2); Special gas cylinder (B3). B2 contains (limited to) dissolved acetylene gas cylinders or liquefied petroleum gas 

cylinders; B3 includes motor vehicle use, winding, non repetitive reassembly, vacuum insulated low-temperature gas cylinders, etc.

(3) Class C: Railway Tank Car (C1); Car tanker or long pipe trailer (C2); Tank container (C3).

(4) D-level: Class I pressure vessel (D1); The second type of low and medium pressure vessel (D2).

(5) Expansion joints for pressure vessels: can be manufactured by units that have obtained the qualification for manufacturing pressure vessels, or by units that have obtained 

the qualification for manufacturing expansion joints for pressure pipelines.

(6) The manufacturing enterprise of pressure vessels designed according to analysis and design standards should hold an A or C level license.

(7) Head: The manufacturing license for boiler pressure vessel heads is divided into two levels, namely heads with a diameter greater than or equal to 1800mm and heads with 

a diameter less than 1800mm. Units that have obtained the qualification to manufacture heads with a diameter greater than or equal to 1800mm also have the qualification to 

manufacture heads with a diameter less than 1800mm. The head manufacturing unit with a diameter greater than or equal to 1800mm shall meet the requirements of the 

basic conditions for manufacturing A3 level pressure vessels, and the head manufacturing unit with a diameter less than 1800mm shall meet the requirements of the basic 

conditions for manufacturing D2 level pressure vessels (and comply with the special conditions specified in the safety technical specifications).