TFS · Hydraulic & Fluid Applications · Problem 10PDFSolution in PDF ↓
TFS · Hydraulic & Fluid Applications · Problem 10
Problem & Solution
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Topic: Pump system — A viscous liquid with a specific gravity of 1.1 is pumped with a volume flow rate of 100 GPM.
Method: The suction pressure measured at the inlet of the pump is 5 psi of vacuum.
Key values: 62.4 pound force per cubic foot as long as you multiply it by the specific gravity 1, 5 psi, 10 psi
Reference: table where you can go to the schedule 40 steel pipe table whatev
✅ Answer: C
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Student questions asked in live office hours about this problem
OH 25
Q: How did you know to keep the velocity term and include the head added by the pump in problem 810 when the reference manual doesn't explicitly show that form of the Bernoulli equation?
A: The problem context tells you—it's asking for pump input power, which is impossible to find without knowing the head or pressure the pump adds. The reference manual gives you the raw Bernoulli equation, but you can derive the form with HA by recognizing that losses (HF) subtract energy on one side, so a pump must add energy (HA) on the other side. You'll use this form so often in practice that you'll internalize it without needing to memorize it.