D/O should not allow residual pressure to fall below _____ on the master intake gauge

D/O should not allow residual pressure to fall below _____ on the master intake gauge

• A. 20 Psi
• B. 15 Psi
• C. 10 Psi
• D. 5 Psi

Answer: (A)

Maintaining a minimum suction pressure at the pump intake is crucial to keep the pump primed, prevent cavitation, and protect seals and bearings. The master intake gauge should not drop below a level that preserves enough pressure to push the fluid into the pump without vaporizing. In this system, about 20 psi is the safe threshold; staying above it helps ensure the fluid stays in contact with the pump, maintains lubrication, and avoids vapor pockets that can cause cavitation, noise, and reduced performance. If the suction pressure falls toward the lower end, the pump can start drawing air, which leads to loss of prime and potential damage. Lower values such as 15, 10, or 5 psi increase the risk of cavitation and starvation.

Maintaining a minimum suction pressure at the pump intake is crucial to keep the pump primed, prevent cavitation, and protect seals and bearings. The master intake gauge should not drop below a level that preserves enough pressure to push the fluid into the pump without vaporizing. In this system, about 20 psi is the safe threshold; staying above it helps ensure the fluid stays in contact with the pump, maintains lubrication, and avoids vapor pockets that can cause cavitation, noise, and reduced performance. If the suction pressure falls toward the lower end, the pump can start drawing air, which leads to loss of prime and potential damage. Lower values such as 15, 10, or 5 psi increase the risk of cavitation and starvation.