Nfpa 99 requires tubing to be cut using a sharp tubing cutter that shall be free from grease, oil, and other lubricants not suitable for oxygen service. After cutting, tubing ends shall be permitted to be?

The requirement for tubing ends to be rolled smooth or deburred is essential for ensuring safety and preventing contamination in oxygen service. When tubing is cut, sharp edges or burrs can form, which may compromise the integrity of the tubing or create points where contaminants can collect.

Rolling smooth or deburring the ends of the tubing ensures that any sharp edges have been smoothed out and that there are no projections that could interfere with fittings or connections. This is critical in systems that handle medical gases, particularly oxygen, where purity and safe flow are paramount. Smooth ends also help to facilitate a proper seal when connecting to other components, reducing the potential for leaks.

The other options, while they might suggest methods for treating the ends of tubing, do not align with the specific requirements outlined for oxygen service. For example, filing may not effectively eliminate all sharp edges or may introduce debris, while reaming could remove material in a way that affects the dimensions of the tubing. Re-cleaning might not address structural concerns and focuses instead on cleanliness rather than ensuring the tubing ends are safe for use. Thus, rolling smooth or deburring is the most appropriate and effective method according to NFPA 99 standards.