Material Cast Iron Soil Pipe

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Cast iron soil pipe and fittings are used for gravity flow systems, primarily for drain, waste, and vent sanitary and storm water applications. Cast iron soil pipe and fittings are classified by two types of connections: hub and spigot, and hubless (often called no-hub). In the hub and spigot classification, one end is enlarged into a “hub” big enough for the plain (spigot) end of another pipe or fitting to be inserted.  In the past, these joints were commonly sealed using lead and oakum. (Oakum is a loose fiber impregnated with a tar or tar-like material. The fiber was traditionally “picked” or “combed” from old hemp rope.) Workers packed the joint with oakum and then poured molten lead over it to create a permanent seal. A more modern method using a thermoset elastomeric gasket is now more common. No-hub pipe is connected using metallic shielded couplings. These look like a neoprene sleeve tightened over the pipe using stainless steel “hose clamps.”

Cast iron soil pipe and fittings conform to standards set by the American Society for Testing and Materials (ASTM A 74-05 for hub and spigot, and ASTM A 888 for hubless.) and the Cast Iron Soil Pipe Institute, (CISPI 301).


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