What treatment is required for tube ends before brazing in medical gas systems, according to NFPA 99?

For brazing tube ends in medical gas systems, as specified by NFPA 99, it is essential that the ends are deburred or rolled smooth. This process involves removing any sharp edges or burrs that may have formed during the cutting process.

Deburring is crucial because sharp edges can lead to improper fits during assembly, which could result in leaks or weak joints after the brazing process. A smooth end ensures a better surface contact between the tubes and the brazing material, contributing to a stronger and more reliable joint.

While other treatments like cleaning, chamfering, or polishing can contribute to the overall preparation of the tubing, they are not specified in NFPA 99 as mandatory steps before brazing. The focus on deburring specifically highlights its importance in achieving the integrity and safety needed in medical gas systems, ensuring compliance with industry standards.