NFPA-99 Practice Exam

The installer shows documentation of the initial pressure test for the vacuum system was conducted at 50 psi. At what pressure should the installer have performed his test?

1. 30 in hg

2. 30 p.s.i

3. 60 p.s.i

4. 150 p.s.i

The correct answer is: 150 p.s.i

In the context of testing vacuum systems, it is essential to ensure that the system can safely and effectively operate under conditions that exceed its normal operational parameters. The documentation indicates that the initial pressure test was conducted at 50 psi, which is below the typical required testing pressure for vacuum systems. According to industry standards, particularly those outlined in NFPA (National Fire Protection Association) codes and other relevant construction standards, vacuum systems are generally required to undergo tests at higher pressure levels to ensure integrity and safety during operation. A test pressure of 150 psi is commonly recommended as it provides a robust margin above normal operating conditions. This level of testing helps to identify any potential leaks or weaknesses in the system that could compromise its function or safety in actual use. Therefore, conducting the test at this higher pressure ensures that the system can withstand operational stress, which is a critical aspect of safety and reliability in any vacuum system application.