NFPA-99 Practice Exam

What materials should the check valve for an emergency oxygen supply connection be constructed of?

1. Plastic, rubber, or PVC

2. Brass, bronze, or stainless steel

3. Aluminum or copper

4. NFPA 99 does not establish any material requirements

The correct answer is: Brass, bronze, or stainless steel

The check valve for an emergency oxygen supply connection must be constructed of materials that are compatible with oxygen service and capable of withstanding high pressures without degrading over time. Brass, bronze, and stainless steel are specifically chosen for their strength, durability, and resistance to corrosion. These materials do not react adversely with oxygen, which is critical for maintaining the integrity and safety of the oxygen supply system. In medical environments, the flow of oxygen needs to be controlled reliably, and materials that can handle the stress of continuous use and potential fluctuations in pressure are essential. The use of these metals also helps to prevent the risk of ignition, which could occur if more reactive materials such as certain plastics or rubbers were employed. The other materials listed, such as plastic, rubber, or PVC, do not offer the necessary durability and security for high-pressure oxygen systems and may not be rated for such applications. Although aluminum and copper are also strong materials, they do not meet the optimal standards for oxygen service in the same way as brass, bronze, or stainless steel. Thus, the standards set forth in NFPA 99 highlight the importance of using materials that ensure safety and compliance in emergency oxygen supply systems.