Pipe, Connecting

a short section of pipe that is added by flaring, riveting, or welding to an opening of a pipeline, a tank, or other structure and used to connect pipelines and fittings to the structure. The free end of a connecting pipe is threaded or fitted with a flange or socket, depending on the type of connection used. Connecting pipes with ends of dissimilar size and shape are called reducers. The connecting pipelines that are used to transport working fluids by the action of a pressure differential are also called connecting pipes.