8 Calculate the head loss in 2000 ft of 14-in.-diameter steel pipe for a flow rate...

 

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8 Calculate the head loss in 2000 ft of 14-in.-diameter steel pipe for a flow rate of 1000 gpm. Use C= 120 and C= 140. 9 A pump station is designed where one pump oper- ates while the other pump is in stand-by; the oper- ating curve is shown in Figure 12. The pump was sized for the peak-hour flow of 2600 gpm at 200 ft of head. The average daily flow is 2.46 MG. The cost of energy is $0.10/kWh. The variable speed drives have an efficiency of 97 percent, the motor is 90 percent efficient, and, considering the power factor, the conversion from hp to kW is 0.8. What is the average pump speed; what is the energy savings if pumps are converted from constant speed to variable speed? 12 What size pipe should be used to supply 1300 gpm so that the velocity does not exceed 3.0 ft/sec assuming a C= 100? (Answer 14 in.) 13 A water main 8 in. in diameter, C= 100, and 800 ft in length is laid 40 ft uphill to residential apartments. When the discharge is 750 gpm as required for fire and fire Head, et FIGURE 12 Characteristic pump curves for Example 7 showing the pump operating envelope. 250 150 100 1750 rpm 1150 rpm 65% 63% 60% bep 1450 rpm 1000 T1 8364 81% 80% Pump operating range 185% bep 46% 5% 120% bep Pump openting envelope 71% 2000 3000 Discharge, gallons per minute 4000 72% 5000 8 Calculate the head loss in 2000 ft of 14-in.-diameter steel pipe for a flow rate of 1000 gpm. Use C= 120 and C= 140. 9 A pump station is designed where one pump oper- ates while the other pump is in stand-by; the oper- ating curve is shown in Figure 12. The pump was sized for the peak-hour flow of 2600 gpm at 200 ft of head. The average daily flow is 2.46 MG. The cost of energy is $0.10/kWh. The variable speed drives have an efficiency of 97 percent, the motor is 90 percent efficient, and, considering the power factor, the conversion from hp to kW is 0.8. What is the average pump speed; what is the energy savings if pumps are converted from constant speed to variable speed? 12 What size pipe should be used to supply 1300 gpm so that the velocity does not exceed 3.0 ft/sec assuming a C= 100? (Answer 14 in.) 13 A water main 8 in. in diameter, C= 100, and 800 ft in length is laid 40 ft uphill to residential apartments. When the discharge is 750 gpm as required for fire and fire Head, et FIGURE 12 Characteristic pump curves for Example 7 showing the pump operating envelope. 250 150 100 1750 rpm 1150 rpm 65% 63% 60% bep 1450 rpm 1000 T1 8364 81% 80% Pump operating range 185% bep 46% 5% 120% bep Pump openting envelope 71% 2000 3000 Discharge, gallons per minute 4000 72% 5000

Answer rating: 100% (QA)

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