Question 91

Gas piping embedded in a concrete floor exposed to moisture must be protected.

Gas piping that is embedded in a concrete floor and exposed to moisture requires protective measures to ensure its integrity and safety. This is crucial to prevent corrosion and other forms of degradation that could compromise the system.

A) shall be installed in layers

This option is incorrect as it does not address the specific requirements for protecting gas piping embedded in concrete. While installation methods may vary, the main concern in this context is the protection against moisture, rather than the layering of the pipes.

B) is not permitted by the Code

This option is also incorrect. The code does not necessarily prohibit gas piping in such conditions, but it does mandate that protective measures be taken. Therefore, the focus should be on the necessary protections rather than an outright prohibition.

C) must be protected

This option is correct because it emphasizes the necessity of protecting gas piping embedded in concrete from moisture. Proper protection methods, such as coatings or insulation, are essential to prevent corrosion and ensure the safe operation of the gas piping system.

D) must be two pipe sizes larger than open air piping

This option is incorrect as it speaks to sizing requirements rather than the critical need for protection against moisture. Pipe size is a separate consideration and does not address the specific environmental concerns posed by being embedded in concrete.

Conclusion

The correct answer highlights the essential requirement for protecting gas piping embedded in concrete from moisture, which is vital for maintaining the safety and functionality of the piping system. Other options either misinterpret the code requirements or focus on irrelevant aspects, underscoring the importance of protection in this specific scenario.