How do you verify the pump is delivering the required flow to all lines?

• A. Rely on pump RPM.
• B. Check only one line.
• C. Visual guess.
• D. Monitor discharge gauges and nozzle pressures to confirm expected GPM for each line; total flow matches plan.

Answer: (D)

To confirm the pump is delivering the required flow to every line, you must measure actual flow at each outlet and compare it to the system design. Use discharge gauges on each line and the nozzle pressures to determine the GPM for that line, then sum the per-line flows to ensure the total matches the planned total. This approach shows not only how much flow is leaving the pump, but how it’s distributed across all lines, so every branch gets its intended share. Relying on pump speed alone isn’t reliable because flow depends on system demand, valve positions, and piping losses. Checking only one line or guessing visually won’t reveal mismatches in other lines or overall total.