During a vacuum piping system test, a test pressure of 12 inches HgV is applied for how long?

The correct answer is based on industry standards for testing vacuum piping systems. When a test pressure of 12 inches of mercury vacuum (HgV) is applied, the recommended duration for holding this test pressure is typically set at 24 hours. This period allows sufficient time to monitor the system for any potential leaks or failures, ensuring that the integrity of the vacuum system is maintained.

Testing for 24 hours provides a good balance between effectively assessing the system's performance while not extending the testing duration unnecessarily. Shorter test durations may not provide adequate time to detect slower leaks, while longer tests may impose unnecessary delays in the installation or maintenance schedules.

Understanding the purpose behind the testing duration highlights the importance of adhering to established protocols, ensuring safety and reliability in medical gas systems.