Copper tube hangers for medical gas piping must be:

• A. Plastic coated in potentially damp locations
• B. Sized for copper tube
• C. Supported from the building structure
• D. All of the above

Answer: (D)

Copper tube hangers in medical gas piping must combine proper fit, solid support, and environmental protection to keep the system safe and reliable. They need to be sized to match the outer diameter of the copper tube so the pipe is held snugly without crushing or excessive movement; this prevents stress on joints and maintains proper alignment. They also must be fastened to the building structure, providing a stable, code-compliant support that can handle the weight of the piping, thermal expansion, and any vibrations. In damp locations, using hangers that are plastic-coated helps protect the copper and the hanger from moisture-related corrosion and wear at contact points, preserving the integrity of the installation. Taken together, these requirements mean all of the above.