Question
Cooling water is pumped from a reservoir to rock drills on a construction job using the pipe system shown. The flow rate must be 600 mpg and water must leave the spray nozzle at $120 \mathrm{ft} / \mathrm{s}$. Calculate the minimum pressure needed at the pump outlet. Estimate the required power input if the pump efficiency is 70 percent.
Step 1
Step 1: We start by using the energy equation for the pump, which is given by: \[h_{\text{pump}} = z_2 + \frac{v_2^2}{2g} + h_{\text{f,ord}} + h_{\text{f,entrance}} + h_{\text{f,90° elbow}} + h_{\text{f,45° elbow}} + h_{\text{f,15k}}\] Show more…
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