1、按化工(HG)行业标准分：整体法兰(IF)、螺纹法兰(Th)、板式平焊法兰(PL)、带颈对焊法兰(WN)、带颈平焊法兰(SO)、承插焊法兰(SW)、对焊环松套法兰(PJ/SE)、平焊环松套法兰(PJ/RJ)、衬里法兰盖(BL(S))、法兰盖(BL)  。
1. According to the industry standard of chemical industry (HG), it can be divided into: integral flange (IF), threaded flange (Th), plate flat welding flange (PL), necked butt welding flange (WN), necked flat welding flange (SO), socket welding flange (SW), butt welding ring loose sleeve flange (PJ/SE), flat welding ring loose sleeve flange (PJ/RJ), liner flange cover (BL (S), flange cover (BL).
2、按石化(SH)行业标准分：螺纹法兰(PT)、对焊法兰(WN)、平焊法兰(SO)、承插焊法兰(SW)、松套法兰(LJ)、法兰盖(不表注)。 3、按机械(JB)行业标准分：整体法兰、对焊法兰、板式平焊法兰、对焊环板式松套法兰、平焊环板式松套法兰、翻边环板式松套法兰、法兰盖。
2. According to the industry standard of petrochemical (SH), it can be divided into threaded flange (PT), butt welding flange (WN), flat welding flange (SO), socket welding flange (SW), loose sleeve flange (LJ), flange cover (not indicated). 3. According to the industry standard of machinery (JB): integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose sleeve flange, flat welding ring plate loose sleeve flange, flange flange.
4、按国家(GB)标准分：整体法兰、螺纹法兰、对焊法兰、带颈平焊法兰、带颈承插焊法兰、对焊环带颈松套法兰、板式平焊法兰、对焊环板式松套法兰、平焊环板式松套法兰、翻边环板式松套法兰、法兰盖。
4. According to national (GB) standards, there are integral flange, threaded flange, butt-welded flange, flange with neck, flange with neck socket, flange with neck loose sleeve, flange flange, flange flange flange, flange flange flange, flange flange flange flange flange.