Cast-Iron Pipe and Fittings
Cast-iron pipe, often called soil pipe, is used for drain, waste, and vent (DWV) systems in residential, commercial, and industrial plumbing. Cast iron is a strong and durable piping material that resists corrosion and abrasion. It also can withstand extreme temperature changes.
Cast iron refers to products made from molten iron that is formed using a mold. Two common iron types are used to make cast-iron pipes and fittings: gray cast iron and ductile cast iron.
Click on each type of cast iron to know more:
Gray Cast Iron
Gray cast iron, with controlled carbon content, has been used for many years for water main piping and sanitary waste piping. Gray cast iron is brittle; however, in 1955, less brittle ductile iron pipe was introduced.
Ductile Cast Iron
As ductile iron is less brittle than gray iron, it holds up better under the weight of a building. Most large water lines are made from ductile iron.
Types of Cast-Iron Pipe and Fittings
Hub-and spigot and no-hub cast-iron pipes and fittings are widely used by plumbers today.
Click on each type of cast-iron pipe to know more:
Hub-and-spigot pipe has a bell shape or enlargement on one end called a hub, or bell. The spigot end of each pipe in the run fits onto the hub. Hub-and-spigot pipe is available in single hub or double hub. A double-hub pipe can be cut to create two single-hub pipes, which can be useful for a job that requires many joints.
As its name suggests, this pipe has no hub on either end. No hub cast-iron pipes and fittings can be used in all areas of plumbing where cast-iron is recommended. No-hub pipe has become very popular because of this feature.
Cast-Iron Pipe Sizes
• Single hub-and-spigot cast-iron pipe is available in lengths of 2 ½, 3 ½, 5, and 10 feet and in diameters of 2, 3, 4, 5, 6, 8, 10, 12, and 15 inches.
The smaller diameters are used in residential construction. The length of the pipe, referred to as the laying length, is the measurement from the base of the hub to the end of the spigot.
• Double-hub pipe is available in 76.2 cm and 152.4 cm lengths. Pipe in 76.2 cm lengths can be cut into two short single-hub pipes.
• No-hub cast-iron pipe is manufactured in lengths of 10 feet. It is available in diameters of 1 ½ 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, and 15 inches.
Cast-iron pipe is classified by its wall thickness.