What two systems may be used to control the discharge pressure of the pump?

The correct answer includes the discharge pressure relief valve and pressure governor, both of which play crucial roles in managing the discharge pressure of the pump in firefighting operations.

The discharge pressure relief valve is a safety device that opens to allow excess fluid to escape from the system when the discharge pressure exceeds a predetermined level. This protects the pump and the connected apparatus from damage due to overpressure. In a firefighting scenario, ensuring that the discharge pressure remains within safe limits is critical for both the performance of the equipment and the safety of the personnel involved.

The pressure governor, on the other hand, is designed to automatically regulate the engine speed in response to changes in discharge pressure. When the discharge pressure decreases, the governor increases engine speed to maintain the desired pressure output. This is particularly important in dynamic environments where the demand for water can fluctuate rapidly. By maintaining a consistent pressure, the pressure governor ensures that the pump operates efficiently and effectively delivers the necessary water flow.

The combination of these two systems—one providing safety and the other ensuring operational efficiency—highlights their importance in managing discharge pressure in pump operations. Both components are integral to maintaining the appropriate pressure levels, making this choice the most suitable in the context of pump control systems.