Which statement best describes using the pump discharge pressure gauge during operations?

• A. It helps verify nozzle pressure targets are met by monitoring discharge pressure.
• B. It measures the intake pressure only.
• C. It is used to adjust foam concentration.
• D. It is used to set the pump’s RPM automatically.

Answer: (B)

The key idea is that the pump discharge pressure gauge shows the pressure on the water as it leaves the pump and heads toward the hose and nozzle. This reading is what you use to verify that you’re delivering the intended nozzle pressure and to monitor how the pump is performing on the discharge side. It tells you whether your attack line is receiving the expected pressure, which is critical for achieving the desired flow and reach.

Intake (suction) pressure is read on the suction gauge, which indicates the pressure at the pump inlet and helps ensure the pump isn’t starved or cavitating. The discharge gauge does not measure intake pressure. Foam concentration is controlled by the foam system, and pump RPM is managed by the pump governor or throttle system, not by the discharge pressure gauge. So the discharge gauge’s role is to confirm nozzle pressure targets by monitoring discharge pressure, not to measure intake pressure or automatically set RPM.