Red Seal Steamfitter/Pipefitter Practice Exam

What material is known for being lightweight and resistant to corrosion compared to metal pipes?

1. Polyethylene

2. Cast iron

3. CPVC

4. Steel

The correct answer is: CPVC

CPVC, or Chlorinated Polyvinyl Chloride, is a type of plastic piping that is lightweight and highly resistant to corrosion, making it an excellent choice for various plumbing and piping applications. One of the significant advantages of CPVC over metal pipes is its ability to withstand a wide range of chemicals without degrading, which enhances its durability in many environments. This resistance to corrosion is particularly beneficial in situations where water or other liquids may lead to the deterioration of metal pipes. Additionally, CPVC is easier to handle and install due to its lightweight nature, which can reduce labor costs and physical strain during installation compared to heavier materials. The thermal capabilities of CPVC also allow it to handle hot water applications effectively, which makes it versatile for residential and commercial applications. In contrast, materials such as cast iron are heavier and more prone to corrosion, particularly in environments with moisture. Steel, while strong, is also susceptible to rust if not properly coated or treated, and polyethylene, although lightweight and resistant to UV damage, may not be suitable for high-temperature applications as effectively as CPVC. Therefore, CPVC stands out as the correct choice due to its combination of lightweight attributes and superior corrosion resistance among the materials listed.