NFPA-99 Practice Exam 2025 – The All-in-One Guide to Exam Success!

Brazing the cut ends of a tube in a medical gas piping system requires careful preparation to ensure the integrity and safety of the joint. The correct choice emphasizes that the cut ends may be rolled smooth or deburred, which is essential for several reasons.

Firstly, rolling the cut ends smooth or deburring them helps remove any sharp edges or burrs that can disrupt the flow of gas, create turbulence, or increase friction within the piping system. This is particularly critical in medical gas systems, where maintaining a smooth flow is vital for safety and efficiency.

Secondly, proper surface preparation aids in achieving a more reliable and effective brazing joint. A smooth surface allows for better adhesion of the brazing material, which contributes to a stronger bond. A well-prepared joint minimizes the risk of leaks, which can be dangerous in the context of medical gases.

In contrast, the other options suggest practices that might not align with the established safety standards or procedural requirements. For example, while purging might be a necessary procedure in some contexts, it is not specifically given as a treatment for the cut ends in this scenario. Similarly, the assertion that extensions need to be added for brazing or that no treatment is required are both incorrect as they overlook the importance of preparing