Basic Tanker Operations Practice Test

What is the preferred operating mode for the pump suction?

static suction head; surface liquid is above the pump suction static discharge head; position of liquid surface is immaterial static suction lift; surface of liquid is below pump suction static discharge lift; position of liquid surface is immaterial

Correct Answer:

static suction head; surface liquid is above the pump suction

Explanation:

When the liquid surface is above the pump suction, the height of the liquid itself provides hydraulic head that helps push fluid into the pump. This static suction head means the pump needs less inlet pressure to start and sustain flow, which lowers the risk of cavitation and makes for smoother operation. If the surface were below the pump, you’d be dealing with static suction lift, where the pump must generate more suction to lift the liquid, increasing cavitation risk and reducing efficiency. The other terms describe discharge-side conditions or situations where the surface height isn’t relevant to suction, so they aren’t the preferred mode for the pump intake.

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