New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is replacing cast iron pressure pipe for underground service in modern construction projects?

1. Concrete pipe

2. Metal pipe

3. Plastic pipe

4. Composite pipe

The correct answer is: Plastic pipe

In modern construction projects, plastic pipe is increasingly replacing cast iron pressure pipes for underground service due to several advantages. One of the key benefits of plastic pipe is its lightweight nature, which simplifies handling and installation compared to heavier materials like cast iron. Additionally, plastic pipes, such as those made from PVC or HDPE, are resistant to corrosion and scaling, which can affect the performance and longevity of traditional materials like cast iron. Furthermore, plastic pipes often provide better flow characteristics because of their smooth interior surfaces, reducing the potential for blockage over time. They also tend to be more cost-effective, both in terms of material costs and installation expenses, as they can be installed using various trenchless techniques that minimize disruption to the surrounding area. In summary, the shift towards using plastic pipe is driven by its beneficial properties, including corrosion resistance, reduced weight, improved flow, and cost-efficiency, making it a preferred choice for underground services in modern construction.