Flange production standard

- Aug 31, 2019-

National Standard: GB/T9112-2010 (GB9113·1-2010～GB9123·4-2010)

Ministry of Chemical Industry Standards: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-2009 Series, HG20615-2009 Series

Ministry of Machinery Standard: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994

Pressure vessel standards: JB1157-82~JB1160-82, NB/T47020-2012~NB/T47027-2012, B16.47A/B B16.39 B16.