Red Seal Steamfitter/Pipefitter Practice Exam

Which of the following is a common characteristic of PVC piping?

1. It is highly flexible and can withstand extreme temperatures

2. It is a lightweight, corrosion-resistant material

3. It is the most suitable for high-pressure steam systems

4. It is made from metals and can be welded

The correct answer is: It is a lightweight, corrosion-resistant material

The characteristic that makes PVC piping widely used in various applications is its lightweight, corrosion-resistant nature. PVC, or polyvinyl chloride, is a synthetic plastic polymer that provides excellent resistance to chemicals, moisture, and degradation from environmental factors. This means it does not rust or corrode like metal piping, making it ideal for water supply and drainage systems, particularly in industries where chemical exposure is a concern. Furthermore, the lightweight aspect of PVC allows for easier handling and installation compared to heavier materials, reducing labor costs and efforts during the installation process. This attribute is highly beneficial in residential, commercial, and industrial plumbing, as it simplifies transport and setup. In contrast, other options do not accurately represent PVC's properties. While PVC can offer some flexibility, it is not highly flexible to the degree implied in the first option and cannot withstand extreme temperatures resembling radical thermal changes. Additionally, PVC is not suitable for high-pressure steam systems, which require materials that can handle high temperatures and pressures, such as metal piping. Lastly, PVC is not made from metals, nor can it be welded, as it is a plastic, thus making the last option inconsistent with the characteristics of PVC.