When is it permissible to use a tool to mechanically limit the depth of the fitting to be brazed in medical gas piping installation?

The use of a tool to mechanically limit the depth of the fitting to be brazed in medical gas piping installation is permissible when the limited depth is not less than the minimum cup depth specified per ANSI/ASME B16.50. This standard dictates the appropriate dimensions and requirements for fitting installations, ensuring that fittings are adequately brazed to maintain the integrity and safety of the medical gas system.

Adhering to these specifications is critical because proper brazing depth ensures a strong joint that can withstand various pressures and operational conditions that medical gas systems may encounter. If the braze does not reach the minimum cup depth, it may result in weak joints that could fail under stress, leading to leaks or system malfunctions.

The focus on maintaining this prescribed depth ensures compliance with safety standards and enhances the reliability of medical gas installations, which is paramount for patient safety and effective healthcare delivery. This practice reflects a commitment to quality and safety in medical gas system installations, making option B the most appropriate answer.