Chapter 11, Problem 11.2.1P

A plant has installed a single suction centrifugal pump with a discharge of 68 m3/hr under 60 m head and running at 1200 rpm. It is proposed to install another pump with double suction but of the same type to operate at 30 m head`and deliver 90 m3/hr. What must be the impeller diameter of the proposed pump if the diameter of the existing pump is 150 mm?

In a pump performance curve shown below, a system curve is generated. Using a 6-inch diameter impeller: (a) If the net positive suction head available is 10 ft. Is the pump safe for cavitation? Support your answer.

A pipeline with a pump leads to a nozzle as shown. Find the flow rate when pump develops an 80 ft (24.4 m) head. Assume head lost in the 6-inch (152 mm) pipe to be five times its velocity head while the head lost in the 4-inch (102 mm) pipe to be twelve time its velocity head. (a) Compute the flow rate (b) sketch the energy grade line and hydraulic grade line, and (c) find the pressure head at the suction side. 8 80 (24.4 m) 3" jet (76.2 mm) 8 70 (21.3 m) Line 2 6" (152 mm) El 30 (15.2 m) Line 1 PUMP (ww zo1)

A fire hose nozzle has a diameter of 1.125 in. According to some fire codes, the nozzle must be capable of delivering at least 250 2.750-in.-diameter hose, what pressure must be maintained just upstream of the nozzle to deliver gal/min. If the nozzle is attached to a this flowrate? Answer p= i psig

It is required to pump water at the rate of 8.750 gpm from a reservoir whose surface is at an elevation of 180 ft to a tank whose bottom is at an elevation of 372 ft, The pump is placed at an elevation of 192 ft, the diameter of the suction pipe is 30 inch, the length of the pipe from the pump to the tank is 290 ft, and the estimated size of this pipe is 24 inch. The sum of the minor head losses in the suction and discharge pipe may be taken as 1.5 ft, if the maximum depth of water in the tank is to be 25 ft, what is the required horsepower of a pump for which the overall efficiency is 67 percent? Assume head loss due to friction in 290 ft + 2 ft Neglect all other head losses.

a. Calculate the pump head b. Plot the EGL and HGL for the system

A wastewater pump is discharging at a rate of 0.5 m3/s. It has a discharge nozzle diameter of 350 mm and a suction nozzle diameter of 400 mm. The reading on the discharge gage located at the pump centerline is 125kN / (m ^ 2) The value on the suction gage located 0.6 m below the pump centerline is 10 kN / (m ^ 2) Determine the head on the pump with Bernoulli's equation.

The pipeline shown in the figure A. takes water from a reservoir and terminates in a nozzlehaving a jet diameter of 2 inches. With the pipe losses shown in the figure, and assuming anozzle loss of (a) 8.76 %, (b) 10.67 % of the velocity head in the jet. Compute the dischargeand make a table showing the elevation head, pressure head, and total head at each of thesix stations

Define specific speed of a pump. Where is it useful? A centrifugal pump runs at a speed of 250 rpm for 50 m³/sec discharge at a head of 50 m. Find the specific speed.