NFPA-99 Practice Exam

What is the duration and pressure for conducting a standing pressure test for positive pressure medical gas piping?

1. 8 hours at 150 psi

2. 8 hours at 20% above operating pressure

3. 24 hours at 150 psi

4. 24 hours at 20% above normal operating pressure

The correct answer is: 24 hours at 20% above normal operating pressure

The correct answer specifies that the standing pressure test for positive pressure medical gas piping should be conducted for a duration of 24 hours at a pressure that is 20% above the normal operating pressure. This approach ensures that the system's integrity and safety can be thoroughly verified over an extended period, which is crucial in a medical setting where gas delivery systems are vital. The reason for the 20% increase above normal operating pressure is to account for any potential leaks or weaknesses in the piping system. By testing the system at a higher pressure, any weaknesses that might only become apparent under normal operating conditions can be identified and addressed. The extended duration of 24 hours allows for ample time for any potential leaks to be detected, ensuring the system's reliability and safety during operation. This method is supported by regulatory guidelines and standards in medical gas piping systems, emphasizing the importance of rigorous testing to maintain safety in healthcare environments.