Complaint
Zhengde Classification of flanges
1. Divide carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy by material
2. According to the production method, it can be divided into forged flanges, cast flanges, welded flanges, etc.
3. According to manufacturing standards, it can be divided into national standards (Ministry of Chemical Industry standards, petroleum standards, electric power standards), American standards (ASTM), German standards (DIN), Japanese standards (JB), etc.
my country's National Standard System for Steel Pipe Flanges GB
1Flange nominal pressure: 0.25Mpa-42.0Mpa
Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42
Series 2: PN0.25, PN0.6, PN2.5, PN4.0
2. Structural form of flange:
a. Flat welding flange PL;b. Flat welding neck SO;c. Butt welding flange WN;d. Socket welding flange SW;e. Loose flange PJ/SEf. Overall tube IF;g. Threaded flange Th;h. Flange cover BL, lining flange cover BL(S).
3. Flange sealing surface types: flat FF, raised surface RF, concave surface FM, convex surface MF, tongue and groove surface TG, ring connection surface RJ
Flanges are used in pairs, threaded flanges can be used for low pressure pipes, welded flanges are used for pressures above 4 kg. Put a gasket between the two flannels and bolt them down. Flanges at different pressures have different thicknesses, and they use different bolts. Pumps and valves, when connected to pipes, are also made into the corresponding flange shape, also known as flange connection.
Shandong Zhengde Metal Manufacturing Co., Ltd. is a production and sales company integrating hot-rolled steel coils, cold-rolled steel coils, galvanized steel coils, color-coated steel coils, section steel, steel pipes, steel wires, metal mesh, stainless steel, aluminum, copper and other metal products integrated large enterprises. Five production and sales bases have been formed in Binzhou, Liaocheng, Wuxi, Tianjin, Jinan and Tai'an, with more than 100 production lines, 4 nationally recognized laboratories, 2 technical engineering centers, and 5 enterprise technology centers. Products are exported to more than 50 countries and regions such as North America, South America, Europe, Africa, Oceania, Middle East, and Southeast Asia.
