Cast iron has been used as a fitting material for pipes for many years, primarily in water and sewage systems. Two primary types of cast iron are used for pipes: gray cast iron and ductile cast iron.
- Gray Cast Iron: This type of cast iron is strong and durable, making it a suitable choice for various applications. It is used in sanitary drainage systems and stormwater systems.
- Ductile Cast Iron: Also known as nodular cast iron or ductile iron, this type is more flexible and resistant to impact and bending. It is often used in water supply and sewage systems due to its high strength and flexibility.
Cast iron is highly durable and can withstand the test of time. It has a long lifespan, can resist corrosion and degradation, and can handle heavy loads and pressure. It is instrumental in water and sewage systems, where pipes may need to withstand significant pressure from the fluid they carry. While cast iron can rust, modern cast iron pipes are often lined with asphalt or other materials that prevent corrosion and rusting. This is vital in water and sewage applications where the pipes are constantly exposed to moisture. Cast iron pipes have good acoustic properties. They can reduce noise transmission, making them suitable for use in buildings where noise control is essential. Once installed, cast iron pipes require relatively little maintenance.
It’s worth noting that while cast iron has been widely used in the past, it has seen some decline in popularity in recent years due to its weight and the availability of alternative materials like PVC and HDPE, which are lighter and easier to install. However, cast iron is still used in specific applications with advantageous properties.