Understanding the Pipe Flange

Release time：2026-01-26    Click：24

　　A pipe flange is a method of connecting pipes, valves, pumps, and other equipment to form a complete piping system. It provides a vital, accessible joint that can be disassembled for maintenance, modification, or inspection. Essentially a disc or ring with bolt holes, it is welded or threaded to the pipe end. A second, matching flange is attached to the connecting equipment, and the two are joined by bolting them together with a gasket sandwiched in between to create a pressure-tight seal.

　　Flanges are standardized under systems like ANSI/ASME in the US to ensure compatibility. Key specifications include pressure class (e.g., 150#, 300#), which dictates thickness and bolt hole size, and facing type (e.g., raised face, flat face). Common types include weld neck for high-stress systems, slip-on for easier alignment, and blind flanges to seal off a pipe end. The material—carbon steel, stainless steel, alloy—is chosen to match the pipe and the conveyed medium's corrosiveness and temperature.

　　Proper installation is critical to prevent leaks. This involves precise alignment of bolt holes, correct tightening sequence and torque on the bolts, and selection of the appropriate gasket material (rubber, graphite, PTFE) for the service conditions. From the vast networks in oil refineries and chemical plants to the steam lines in a heating plant, pipe flanges are the robust, modular joints that make complex, maintainable, and reliable piping systems possible, serving as the strategic nexus points in fluid conveyance infrastructure.

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