NFPA-99 Practice Exam

Which method can be used to ensure that no cross connections exist after completing all installations?

1. Individual pressurization.

2. Pressure differential.

3. Both individual pressurization and pressure differential.

4. Either individual pressurization or pressure differential.

The correct answer is: Either individual pressurization or pressure differential.

The method of ensuring that no cross connections exist after completing all installations is critical for maintaining safety and operational integrity in medical gas systems. Individual pressurization involves separately pressurizing different zones or areas within a facility, ensuring that gases are contained within their intended pathways. This helps to prevent any potential for backflow or unintended mixing of gases. Pressure differential monitoring, on the other hand, involves maintaining a pressure difference between areas to ensure that gases flow in a controlled direction, preventing cross connections. If one area is pressurized higher than another, any potential pathways between them will not allow for gas movement into the lower-pressure area, thereby reducing the risk of cross connections. Using either method independently can be effective in preventing cross connections. However, employing both methods together would provide an even more robust safeguard. Therefore, the answer indicates that either method can be utilized to achieve the desired outcome of ensuring that installations are free from cross connections, emphasizing flexibility in choosing the approach that best fits the operational context of the facility.