Master Plumber Practice Exam

What type of piping should be used for sewer or other drainage piping installations near buildings?

1. ABS

2. Cast iron

3. Asbestos cement

4. Copper

The correct answer is: Asbestos cement

The most suitable choice for sewer or drainage piping installations near buildings is cast iron. Cast iron pipes are renowned for their strength, durability, and ability to handle the pressures and stresses associated with sewage and wastewater systems. They are also resistant to corrosion and provide excellent sound attenuation, which is essential in urban environments to minimize noise transmission from wastewater systems. Additionally, cast iron piping has a long service life, which helps reduce the risks of leaks and failures that could result in costly repairs and environmental hazards. It can be installed in various configurations, such as vertical or horizontal layouts, making it versatile for different applications near building structures. ABS (Acrylonitrile Butadiene Styrene) is a durable plastic material often used for drainage pipes but may not provide the same sound-dampening qualities as cast iron. Asbestos cement was historically used for pipes, but due to health risks associated with asbestos, its use has been largely discontinued. Copper piping is primarily utilized for water supply lines rather than for drainage applications, as it can be susceptible to corrosion from wastewater. Given the context of durability, resilience, and application, cast iron piping is the preferred choice for sewer and drainage systems near buildings.