PDP stands for pump discharge pressure. Which description best matches its role during a run?

PDP stands for pump discharge pressure. Which description best matches its role during a run?

• A. Pump intake pressure, used to regulate priming.
• B. Pump discharge pressure, used to set valve and engine settings.
• C. Output volume pressure, used to calculate capacity.
• D. Standby pressure, used to maintain baseline.

Answer: (B)

Pump discharge pressure is the pressure on the discharge side of the pump—the actual pressure being delivered into the hose and nozzle. During a run, you use this reading to set and maintain the required pressure by adjusting the pump’s engine settings (throttle or governor) and the discharge valve. If the PDP is below the target, you increase the engine speed or open the discharge valve more; if it’s above target, you back off or close the valve. This pressure readout reflects the system’s friction losses and elevation changes, guiding you to deliver the correct pressure to the attack line. It’s not the suction (intake) pressure, not a measure of capacity, and not a standby pressure.

Pump discharge pressure is the pressure on the discharge side of the pump—the actual pressure being delivered into the hose and nozzle. During a run, you use this reading to set and maintain the required pressure by adjusting the pump’s engine settings (throttle or governor) and the discharge valve. If the PDP is below the target, you increase the engine speed or open the discharge valve more; if it’s above target, you back off or close the valve. This pressure readout reflects the system’s friction losses and elevation changes, guiding you to deliver the correct pressure to the attack line. It’s not the suction (intake) pressure, not a measure of capacity, and not a standby pressure.