Flange connections involve securing two pipes, fittings, or equipment to separate flange disks first, then joining the two flange disks together with a flange gasket and bolts, thereby completing the connection. Some fittings and equipment come with a flange disk already attached, which also falls under flange connections. Flange connections are an important method of pipe construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, where the pipe diameter is small and the pressure is low, flange connections are not visible. However, in boiler rooms or production sites, you'll find flange connections on pipes and equipment everywhere.

The types of flange connections, categorized by their connection methods, include: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, loose-fitting flanges with socket welding rings, loose-fitting flanges with flat welding rings, ring-groove flanges, and large diameter flat flanges, large diameter high-neck flanges, blind flanges with bevel, and loose-fitting flanges with welding rings, etc.