Flanges are pipe fittings that are used to connect pipes or fittings together to perform different functions. Mild Steel Flanges are common in usage as they provide a medium range of strength and corrosion resistance in a balance. A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.