1. According to the chemical (HG) industry standard: Integral flange (IF), threaded flange (Th), plate slip-on flange (PL), weld neck flange (WN), weld neck flange (SO), socket weld flange (SW), weld neck ring loose flange (PJ/SE), slip-on ring loose flange (PJ/RJ), lined flange cover (BL(S)), flange cover (BL).
2. According to the petrochemical (SH) industry standard: Threaded flange (PT), weld neck flange (WN), slip-on flange (SO), socket weld flange (SW), loose flange (LJ), flange cover (not specified).
3. According to the machinery (JB) industry standard: Integral flange, weld neck flange, plate slip-on flange, weld neck ring plate loose flange, slip-on ring plate loose flange, flanged ring plate loose flange, flange cover.
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.
