Flanges are piping components bolted together using gasket in between two flanges as a sealing material. Flanges are used to connect pipes with each other, connect pipes to flanged valves, connect pipes to flanged fittings, connect pipes to flanged piping specialty items such as strainers and to isolate piping sections using a blind flange.A flange is designed to connect sections of pipe to join them to an assembly such as a pressure vessel, valve or any equipment. Flanges are joined by bolting, and sealing is completed with the use of gaskets and other sealing methods like spray guards or specific spray flanges. If it’s not properly fit then it means there is a gap through which a fraction of undesirable substance may flow out of the system.