During an annual pump test, what percentage of rated capacity must an apparatus deliver at 150 PSI for 20 minutes?

The requirement during an annual pump test is that the apparatus must deliver a certain percentage of its rated capacity at a specific pressure for a set duration. For a pump test at 150 PSI, the standard indicates that the apparatus should be able to deliver 100% of its rated capacity. This ensures that the fire department can rely on the pump to function at its full capacity during emergency situations.

Delivering 100% of rated capacity not only demonstrates the pump's efficiency but also assures readiness for the demands typically encountered during firefighting operations. This benchmark aligns with the operational standards set forth by various firefighting and mechanical engineering regulations, which prioritize full-capacity performance for safety and effectiveness in real-world scenarios. Thus, a performance of 100% is essential to meet operational readiness and reliability expectations.