By using bolted connectors and gaskets, Pipe Flanges join the pipes and parts of a piping system. Flanges are primarily used to create pipework systems by joining pumps, pipes, valves, and other pieces of equipment. Flanges are often threaded or welded, and you may join two flanges together by bolting them together with gaskets to create a seal that allows for simple access to the pipe system. It also provides easy access for cleaning, inspection, or modification. Pipe Flanges are usually welded or screwed.