Red Seal Gasfitter — Class A Practice Exam

What does the "yellow label" on gas piping indicate?

1. That the pipe is suitable for high-pressure applications

2. That the pipe is designed for hot water systems

3. That the pipe is suitable for underground use and is protected from corrosion

4. That the pipe has been tested for quality assurance

The correct answer is: That the pipe is suitable for underground use and is protected from corrosion

The yellow label on gas piping signifies that the pipe is suitable for underground use and has been treated to resist corrosion. This labeling is essential for ensuring that the materials used in the installation meet the necessary safety standards and regulations for applications where piping will be buried. The yellow color serves as a clear visual indicator for anyone inspecting or working on underground installations, alerting them that these pipes are specifically designed to withstand the adverse conditions they will face, such as moisture and soil acidity. Choosing the appropriate piping material marked with the yellow label is crucial in preventing premature failure and gas leaks in underground systems, which could lead to serious safety hazards. Therefore, understanding the implications of this labeling is fundamental for professionals working with gas piping systems.