When drafting from a static water source, what action helps prevent losing prime?

When drafting from a static water source, what action helps prevent losing prime?

• A. Close booster line to prevent losing prime
• B. Open discharge valve
• C. Open booster line to prevent losing prime
• D. Increase engine RPM

Answer: (C)

Maintaining prime while drafting from a static water source comes down to keeping a continuous water column on the suction side and preventing air from being drawn into the pump. Opening the booster line provides a working discharge path that helps water circulate and purge any small air pockets, which keeps the suction side pressurized and maintains prime. If the booster line is closed, air can be sucked into the suction line and prime can be lost. Opening the booster line specifically addresses the prime issue, while simply opening the discharge valve or increasing engine RPM doesn’t directly prevent losing prime in this scenario.

Maintaining prime while drafting from a static water source comes down to keeping a continuous water column on the suction side and preventing air from being drawn into the pump. Opening the booster line provides a working discharge path that helps water circulate and purge any small air pockets, which keeps the suction side pressurized and maintains prime. If the booster line is closed, air can be sucked into the suction line and prime can be lost. Opening the booster line specifically addresses the prime issue, while simply opening the discharge valve or increasing engine RPM doesn’t directly prevent losing prime in this scenario.