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A flange, also known as a flange plate, connects to pipes, equipment, and vessels through welding methods such as butt welding, fillet welding, and socket welding, as well as threaded connections and clamp connections. The connection of two flanges allows pipes and equipment to be connected to each other, forming a pipeline system; this is the function of flanges in piping systems. Two flanges are connected by placing a gasket between them and tightening them with bolts to form a sealed, detachable connection.

　　Flanges are commonly used components in piping systems. They connect pipelines and equipment with other pipe fittings such as elbows, tees, and valves. During pipeline operation, due to differences in the transported medium, temperature, flow rate, pipeline length, horizontal height, and pressure generated by the concrete pump, special attention must be paid to the material and quality of the products when selecting pipe components and fittings. When purchasing pipes and fittings, carefully check the relevant national and international standards, and conduct sufficient design and evaluation of the required product dimensions and pressure. Carefully select carbon steel fittings, alloy steel fittings, stainless steel fittings, and other material fittings as needed, and strictly control the quality and technical requirements, production, and inspection processes of the fittings.

　　Flange materials can be divided into many types: carbon steel Q235.20#, stainless steel 304, 316, 304L, 316L, S321, S310, duplex steel 31803, S2025, alloy steel 16Mn, 12CrMo, etc., which can be selected as needed; implementation standards include GB/T9119, HG/T20592, and American, German, and Japanese standards.

　　There are many types of flanges, including plate butt welding flanges, weld neck flanges, weld neck butt welding flanges, socket welding flanges, threaded flanges, flange covers, loose ring butt welding flanges, loose ring butt welding flanges, ring groove flanges and flange covers, large diameter flat flanges, large diameter high neck flanges, and blind flanges. Models and sizes range from nominal diameter DN10 to DN4000 and more; shapes can be round, square, oval, and various other non-standard shapes.

　　During procurement, sales, and use, pipe fittings should be selected according to their purpose. It is recommended to follow design principles, use national standard pipe fittings, and select general standard series flanges. Given that non-standard and secondary standard flanges are sometimes used in practice, please use them cautiously and pay attention to engineering quality and safety! While considering construction and operating costs, strive for a double harvest of safe production and economic benefits.