plumbing03.htm Plumbing

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The types of piping that can be used in a waste system are cast-iron soil pipe, rigid plastic pipe (two kinds), galvanized steel pipe, and rigid copper tubing. The type of rigid copper tubing used in a waste system is called drain waste vent (DWV).

Cast-Iron Soil Pipe

Cast-iron soil pipe is used for waste lines and venting. It is cast in 5- and l0-foot lengths and in three different styles—single-hub, double-hub, and no-hub.

Single-hub pipe. This pipe has a hub on one end and a spigot on the other. The spigot of one section fits into the hub of the next. It is used for pipe-to-pipe and/or pipe-to-fitting connections.

Single-hub pipe


Double-hub pipe. This pipe has a hub on each end. It is cut and used when pieces of pipe shorter than 5 feet are needed. Waste is minimized because two usable lengths of pipe result. It is used for pipe-to-pipe or pipe-to-fitting connections.

Double-hub pipe


No-hub pipe. This pipe has plain ends. It is used for pipe-to-pipe and pipe-to-fitting connections. No-hub pipe enables a faster method of joining than the method used for pipes with hubs. These methods will be discussed in Learning Event 4.

No-hub pipe


Rigid Plastic Pipe

Rigid plastic pipe can be used anywhere in the waste system. Plastic pipe is joined with solvent cement. There are two types-acrylonitrile-butadienestyrene (ABS) and polyvinyl chloride (PVC). ABS and PVC have the same uses. They both have a rigid, plastic appearance. PVC is white or sometimes pastel, and ABS is black or grey. Both come in 10-and 20-foot lengths.

Rigid Plastic Pipe


Galvanized Steel Pipe

Galvanized steel pipe is generally used in venting. It is the same kind used in a water system-made from mild carbon steel and galvanized to prevent rust. It is joined with a threaded joint in pipe-to-pipe or pipe-to-fitting connections. Galvanized steel should not be used underground. It comes in 21-foot lengths.

Galvanized Steel Pipe


Rigid Copper Tubing (DWV)

Rigid copper tubing is marked with a yellow stripe in the DWV sizes, and it is expensive. Rigid copper tubing can be used anywhere in the waste system, but it is most often used for the drain waste vent. It is connected to fittings by a soldered joint. It comes in 10-and 20-foot lengths and can be assembled before making permanent connections.

Rigid Copper Tubing (DWV)


Cast-Iron Soil pipe


Rigid Plastic pipe (ABS and PVC)


Galvanized Steel Pipe


Rigid Copper Tubing (DWV)

David L. Heiserman, Editor

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Revised: June 06, 2015