Uses Of Cast Iron Soil Pipe

             In buildings, the principal assembly of this piping is installed within the partitions and serves the tub, lavatory, and water closet fixtures. The main line in this assembly is the cast iron soil stack, which runs vertically from the building drain up through the structure and through the roof. Waste lines are connected to this main soil stack, and vent lines may also be tied in at a point above the highest fixture. In some installations vent lines are connected to a separate vent stack, which acts as the main source of air to and from the roof. 

             The building or house drain, the lowest horizontal piping in the drainage system, receives the discharge from the soil, waste, and drainage pipes from within the building and conveys the discharge to the building sewer. The building or house sewer, in turn, conveys the discharge outside of the structure, to the point prescribed by the local plumbing code for joining of the city sewer, septic tank or other means of disposal. 

             Another use for cast iron soil pipe and fittings in building construction is for storm drainage from roofs, yards, areaways and courts. It is used for collecting subsoil drains, which are placed around the foundation for connection into a storm drainage system, or into a sump. It is also used for roof leaders, particularly when these are placed within the building, pipe space, or other area. Extensive use is made of soil pipe for storm drainage on high-rise buildings where large setbacks accumulate substantial amounts of rainwater and snow. At present, cast iron soil pipe is used in high rise building construction for drain, waste, vent, and sewer purposes without concern for building height and is, in fact, the preferred material. There are large numbers of uses for cast iron soil pipe other than in building construction.