What should you expect during a hydro test of a vessel or piping related to airflow?

During a hydro test of a vessel or piping system, it's crucial to understand the behavior of air and fluid dynamics within the system. When a hydro test is conducted, water is introduced into the system, and any trapped air must be vented out to prevent pressure issues and ensure an accurate assessment of the system's integrity.

The correct answer indicates that air or airflow may be present from high point vents. This is because, as water fills the system, any air pockets will seek the highest point to escape, which is typically through the venting mechanisms designed for this purpose. If the system is properly vented, you should expect to see and hear air being expelled from these vents as water displaces the air. This venting process is essential to ensure that the test can accurately measure the system's ability to contain the liquid without leaks.

The expectation regarding silence is misleading; while the test itself might not produce excessive noise, the expulsion of air can create sounds that indicate air is being evacuated. Likewise, having no air coming from the vents is unlikely, as some air must always be present at the beginning before the system is entirely filled with water. While flooding of lower floors can occur if there are significant leaks or failures in the system, it is