1 A Double Suction Centrifugal Pump Delivers 70ft3 Sec Of Water At A Head Of 12 M Running At 1250rpm What Is The Speci 1 (199.11 KiB) Viewed 32 times
1. A double suction centrifugal pump delivers 70ft3/sec of water at a head of 12 m running at 1250rpm. What is the specific speed of the pump? 2. The centerline of a centrifugal pump is located 2.5 m above from the high tide level. The seawater varies two meters from high tide to low tide level. If friction loss at the suction is 0.8 m, determine the total suction head. 3. A centrifugal pump requires 40ft head to deliver water from low level to higher level. If pump speed is 1600rpm, determine the impeller diameter of the centrifugal pump. 4. The suction pressure of a pump reads 2 -inches mercury vacuum and discharge pressure reads 130psi is use to deliver 100gpm of water with specific volume of 0.0163ft3/lb. Determine the pump work. 5. A pump is to deliver 150gpm of water at a head of 120 m. If pump efficiency is 70%, what is the horsepower rating of motor required to drive the pump? 6. A motor is used to drive a pump having an efficiency of 85% and 70% respectively. What is the combined efficiency of pump and motor? 7. In a boiler feed pump, the enthalpy at the entrance is 765 kJ/kg. If pump has a head of 900 m, what is the exit enthalpy of the pump? 8. A submersible pump delivers 350gpm of water to a height of 5ft from the ground. The pump was installed 120ft below the ground level and draw down of 8ft during the operation. If water is 25ft above the pump, determine the pump power. 9. Determine the number of stages needed for a centrifugal pump if it is used to deliver 400gal/min of water and pump power of 15hp. Each impeller develops a head of 38ft. 10. A boiler feed pump receives 50 liters /second of water with specific volume of 0.00112 m3/kg at a head of 750 m. What is the power output of the driving motor if pump efficiency is 65% ? 11. What power can a boiler feed pump can deliver a mass of 35 kg/s water at a head of 500 m ? 12. A pump running at 100rpm delivers water against a head of 30 m. If pump speed will increased to 120 rpm, what is the increase in head?
13. A pump is used to deliver 50 liters/second of seawater at a speed of 120rpm. If speed will increase to 135rpm, determine the increase in pump capacity. 14. A 15 kW motor running at 350rpm is used to drive a pump. If speed will change to 370rpm, what is the increase in power? 15. A certain pump is used to deliver 150gpm of water having a density of 61.2lb/ft3. The suction and discharge gage reads 4inHg vacuum and 25psi respectively. The discharge gage is 2ft above the suction gage. What is the brake power of the motor if pump efficiency is 75% ? 16. The discharge pipe of the pump is 400 mm in diameter delivers 0.5 m3/sec of water to a building, which maintains a pressure of 100kPa at a height of 30 m above the reservoir. If equivalent head is 2 m, what power the pump must furnish? 17. A centrifugal pump is designed for 1800rpm and head of 61 m. Determine the speed if impeller diameter from 305 mm to 254 mm. 18. Water from a reservoir A10 m elevation is drawn by a motor driven pump to an upper reservoir B at 72 m elevation. Suction and discharge head loss are 0.15 m, respectively. For discharge rate of 15 liters/sec, find the power input to the motor if overall efficiency is 65%. 19. The elevation of suction reservoir is 5 m above the pump centerline and delivers to 85 m elevation tank, which maintain 150kPa. If 1.5 m3/sec of water is used to deliver a total head of 3 m, determine the power needed by the pump. 20. Water from a reservoir is pumped over a hill through a pipe 900 mm in diameter and a pressure of one kg/cm2 is maintain at the pipe discharge where the pipe is 85 m from the pump centerline. The pump have a positive suction head of 5 m. Pumping rate of the pump at 1000rpm is 1.5 m3/sec. Friction losses is equivalent to 3 m head loss. What amount of energy must be furnished by the
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