Flange connections involve securing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between them and fastening them together with bolts to complete the connection. Some fittings and equipment come with their own flange discs and are also considered flange connections. Flange connections are a crucial method in pipeline construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, you may not see flange connections when the pipe diameter is small and the pressure is low. However, in boiler rooms or production sites, you'll find pipes and equipment connected by flanges 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 fit socket welding flanges with neck, loose fit flat welding flanges, ring groove flanges, and flange covers, large diameter flat flanges, large diameter high neck flanges, gasket blind flanges, and socket welding flanges with loose fit.