During operation, which gauge reading verifies nozzle pressure and overall system performance?

• A. Intake gauge reading.
• B. Nozzle type selection.
• C. Discharge gauge reading indicating nozzle pressure and system performance.
• D. Ambient air temperature.

Answer: (C)

The discharge gauge reading is what verifies nozzle pressure and overall system performance. It shows the pressure on the discharge side where the water leaves the pump and travels through the hose to the nozzle. By monitoring this value, you can confirm the pump is delivering the intended discharge pressure and that friction losses, elevation changes, and the nozzle’s demand are all within expected limits. This helps ensure the nozzle will perform correctly and the system is delivering the required flow. The intake gauge measures suction-side pressure and is useful for draft conditions, but it doesn’t indicate nozzle pressure or overall downstream performance. Ambient temperature and nozzle type selection aren’t direct indicators of current system performance.