Pressure vessel manufacturing license

A
(A1) super high pressure vessel and high pressure vessel;
(A2) third kinds of low and medium pressure vessels;
(A3) field resistance welding or spherical shell plate manufacture of spherical tanks;
(A4) non - metallic pressure vessels;
(A5) Note: A1 should indicate the hyperbaric oxygen chamber monolayer, multilayer welding, forging, winding and heat set, round plate, seamless, forging, control structure
B
(B1) seamless gas cylinders;
(B2) welding gas cylinders;
(B3) special gas cylinders note: B2 indicates (limited) dissolved acetylene cylinders or liquefied petroleum gas cylinders. B3 indicate the electromechanical vehicle, winding, non refillable, vacuum insulation cryogenic cylinders etc.
C
(C1) railway tanker;
(C2) tanker or long tube trailer;
(C3) tank container
D
(D1) the first type of pressure vessel;
(D2) second categories of low and medium voltage capacity