Threaded flanges are confined to special applications. Their chief merit lies in the fact that they can be assembled without welding this explains their use in extremely high pressure services, particularly at or near atmospheric temperature, where alloy steel is essential for strength and where the necessary post weld heat treatment is impractical. Threaded pipe flanges are protruding rims, edges, ribs, or collars used to make a connection between two pipes or between a pipe and any type of fitting or equipment component. Pipe flanges are used for dismantling pipe systems, temporary or mobile installations, transitions between dissimilar materials, and connections in environments not conducive to solvent cementing. Threaded pipe flanges are a type of Steel Flange which slides over the end of steel piping and then welded in place. Because the pipe slips into the flange are both welded, resulting in sufficient strengh and no leak.
