1. According to Chemical Industry (HG) standards: Integral flanges (IF), threaded flanges (Th), plate slip-on flanges (PL), weld neck flanges (WN), weld neck flanges (SO), socket weld flanges (SW), weld neck flanges (PJ/SE), weld neck flanges (PJ/RJ), lined flange covers (BL(S)), flange covers (BL).
2. According to Petrochemical Industry (SH) standards: Threaded flanges (PT), weld neck flanges (WN), weld neck flanges (SO), socket weld flanges (SW), loose flanges (LJ), flange covers (not specified).
3. According to Machinery Industry (JB) standards: Integral flanges, weld neck flanges, plate slip-on flanges, weld neck plate loose flanges, weld neck plate loose flanges, flanged ring plate loose flanges, flange covers.
4. According to national (GB) standards: integral flanges, threaded flanges, welding flanges, necked slip-on flanges, necked socket welding flanges, welding ring necked loose flanges, plate slip-on flanges, welding ring plate loose flanges, slip-on ring plate loose flanges, flanged ring plate loose flanges, and flange covers.
