Question
Consider the flow system shown in Problem 8.90 Evaluate the $N P S H A$ at the pump inlet. Select a pump appropriate for this application. Use the data on pipe aging from Problem 10.63 to estimate the reduction in flow rate after 10 years of operation.
Step 1
We have four elbows with a loss coefficient (K) of 12 each, so the total loss coefficient for the elbows is $4 \times 12 = 48$. For the square inlet, the loss coefficient (K) is 0.5. Show more…
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Consider the flow system shown in Problem 8.124 Assume the minimum $N P S H R$ at the pump inlet is $15 \mathrm{ft}$ of water. Select a pump appropriate for this application. Use the data for increase in friction factor with pipe age given in Problem 10.65 to determine and compare the system flow rate after 10 years of operation.
Consider the flow system and data of Problem 10.68 and the data for pipe aging given in Problem $10.63 .$ Select pump(s) that will maintain the system flow at the desired rate for $(\text { a }) 10$ years and (b) 20 years. Compare the delivery produced by these pumps with the delivery by the pump sized for new pipes only.
Consider again the pump and piping system of Problem $10.64 .$ Estimate the percentage reductions in volume flow rate that occur after (a) 20 years and (b) 40 years of use, if the pump characteristics remain constant. Repeat the calculation if the pump head is reduced 10 percent after 20 years of use and 25 percent after 40 years. (Use the data of Problem 10.63 for increase in pipe friction factor with age.)
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