Piping for category 3 positive-pressure medical gases shall be cleaned for oxygen service, delivered plugged or capped, and hard drawn, seamless copper ASTM _?

The correct context for this question pertains to the materials and standards used for medical gas piping, particularly for positive-pressure medical gases such as oxygen. In this case, hard drawn, seamless copper piping must meet certain specifications to ensure safety and compatibility with medical gases.

ASTM B819 specifically refers to the standard for seamless copper tube suitable for medical gas systems. This standard includes requirements for the cleaning processes necessary for oxygen service, ensuring that the piping is free of contaminants that could pose a hazard when in use in medical settings. The requirement for the piping to be delivered plugged or capped further contributes to preventing contamination during handling and installation.

In contrast, the other standards mentioned have different applications:

• ASTM B88 addresses general plumbing and water tubing, not specifically for medical gases.
• ASTM B280 relates to copper and copper alloy tubing for air conditioning and refrigeration, therefore not suitable for medical gas systems.
• ASTM B597 covers copper pressure tubing for high-pressure service, which does not apply to the specific requirements needed for medical oxygen systems.

Thus, the specification in ASTM B819 is critical for ensuring the integrity and safety of medical gas installations.