What is the action called when drain valves and high point vents are opened to drain the system?

What is the action called when drain valves and high point vents are opened to drain the system?

• A. Draining
• B. Filling
• C. Purging
• D. Venting

Answer: (A)

The action is draining. Opening drain valves lets the liquid exit the system, while opening high-point vents allows air to escape as the liquid drains. This combination prevents air pockets that would slow or block drainage and ensures the system is emptied. Filling would add liquid, not remove it; purging targets removing gas or air with a purge gas, not simply draining liquid; venting releases gas but doesn’t remove liquid from the system by itself. So the process described is draining.

The action is draining. Opening drain valves lets the liquid exit the system, while opening high-point vents allows air to escape as the liquid drains. This combination prevents air pockets that would slow or block drainage and ensures the system is emptied. Filling would add liquid, not remove it; purging targets removing gas or air with a purge gas, not simply draining liquid; venting releases gas but doesn’t remove liquid from the system by itself. So the process described is draining.