A pump operating in an industry is designed with a 228 mm impeller size with saf

Question

A pump operating in an industry is designed with a 228 mm impeller size with safety factor reasons for future projection of development. The current flow rate requirement is 40 liters / s. In order to meet the flow rate requirements, the discharge valve is closed so that the flow rate is appropriate, resulting in an increase in the pump's actual head and decreased efficiency. The pump performance curve is as shown in the figure below. Using the graph, specify:
a. Existing pump power under current operating conditions.
b. Diameter impeller that you think fit the current needs with a head of 37 meters.
c. Power pump with the new impeller diameter.
d. The savings value obtained in a year if using a new impeller (the price of electrical energy Rp 1500 / kWh)

istrik Rp. 1500/kWh). } - MAXIMUM POWER 48.00 SPEED: 2945 R.P.M. INLET DIA.: 125 mm DISCH DIA: 80 mm No. 2 SHAFT MODULS R S 8 IMPELLER DIA.. mm Total Head (m) 8 8 8 more 0 5 10 60 65 70 7: 15 20 25 30 35 40 45 50 55 Volumetriclomite (ites/second Gamhar? Kurya nerforma noma centrifugal

Explanation / Answer

Answer a)

Existing pump power under current operating conditions = 33KW (interpolated from graph)

Answer b)

Impeller diameter 0f 182mm will deliver flow rate 40 litre/sec with a operating head 37 meters

Answer C)

The power of the pump with new impeller diameter is 18.3 KW

Answer d)

Initially it was 33KW. Now it has reduced to 18.3 KW. Difference is 14.7 KW and that is the savings

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