What occurs when the return venture senses 560 gpm or more for 60 seconds while the issue venture has a 600 gpm flow on the bypass control valve?

The situation described in the question involves a control system that monitors the flow rates of various components within a water and fuel system. When the return venture detects a flow rate of 560 gallons per minute (gpm) or more for 60 seconds while the issue venture operates at 600 gpm, the system responds in a specific manner to manage pressure and pump operation.

Selecting the correct answer indicates that the return venture deenergizes, which is a critical action in maintaining the system's stability and efficiency. This means that the control system recognizes that the flow rate has exceeded a certain threshold, indicating a potential for imbalances or inefficiencies in flow management.

By deenergizing, the system can prevent further issues such as excessive pressure buildup or malfunction of the pumps. The mention of building pressure up to 175 psi signifies the system's need to maintain safe and effective operating conditions under the specified flow scenario. Also, calling the lead pump off ensures that one pump is temporarily paused to allow for safe operations, enabling other components to function without overload.

This choice reflects an important safety and operational protocol designed to protect the integrity of the system whenever substantial flow discrepancies are detected. As a result, the focus on managing pressure and controlling pump operations ensures that the