A pumping system utilizing a centrifugal...

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Question 1 of 205eccef9bbacbc34ba4d45497

A pumping system utilizing a centrifugal pump is designed for a specific discharge head in feet. What happens to the pump's discharge pressure when the Specific Gravity (SG) of the fluid pumped changes?

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🔍 Key Concepts

• Specific Gravity (SG) and how it relates to pressure (psi) versus head (feet of liquid) • Difference between head (ft) and pressure (psi) for a pump curve • How centrifugal pumps are usually selected for head, not for pressure

💭 Think About

• If a pump is designed to deliver a fixed head in feet, what does that mean in terms of energy per unit weight of the liquid? • How does changing the fluid SG affect the conversion between head in feet and pressure in psi? Does head stay constant or does psi stay constant for a given pump? • Think about the formula that links pressure (psi), head (ft), and specific gravity. What changes in that equation when SG changes?

✅ Before You Answer

• Write or recall the relationship: Head (ft) ↔ Pressure (psi) and SG (e.g., that a certain number of feet of water column equals a certain psi at SG = 1.0). • Decide whether the pump characteristic is fixed in ft of head or psi, and which quantity changes when SG changes. • Check which answer choice correctly links higher vs. lower SG to increasing or decreasing discharge pressure (psi) while assuming the pump head in feet is fixed.

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