During the annual service test, the pump must deliver what percentage of its rated capacity at 250 psi for at least 10 minutes?

• A. 50% at 250 psi for 10 minutes
• B. 20% at 100 psi for 5 minutes
• C. 75% at 500 psi for 15 minutes
• D. 100% at 150 psi for 20 minutes

Answer: (A)

During the annual service test, you’re checking that the pump can keep a meaningful flow while maintaining a relatively high discharge pressure for a sustained period. The requirement is to deliver 50% of the pump’s rated capacity at 250 psi for 10 minutes. This combination verifies the pump’s ability to handle friction losses, valve operations, and cooling while operating under a high-pressure condition that resembles real attack-line scenarios. If the pump can sustain half its rated flow at 250 psi for 10 minutes, it demonstrates the reliability needed for prolonged operation without overheating or losing prime. The other options either ask for the wrong pressure, the wrong flow percentage, or the wrong duration, which don’t align with the standard test criteria.