Used to carry liquids, gases, slurries, or fine particles. A piping system generally includes the complete interconnection of pipes.Piping systems are essential. Connections can be screwed, flanged, welded, or press fit. Common components include, pipes, valves, gaskets, hoses, expansion joints, sight flow glasses, filters, strainers, elbows, flanges, tees, caps, unions, fittings, nipples, plugs, bushings, reducers, y-bends, return bends, piping support.