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In: Mechanical Engineering

A centrifugal pump has the following pressure - capacity characteristics: Pressure (KPa) 500 495 490 480...

A centrifugal pump has the following pressure - capacity characteristics:

Pressure (KPa) 500 495 490 480 465 455 420 395 360 325 285
Capacity (m3h-1) 0 25 50 75 100 125 150 175 200 225 250

It is planned to use this for a process having the following system characteristic:

Pressure (KPa) 350 370 400 435 465 505 545 595 660 725 800
Capacity (m3h-1) 0 25 50 75 100 125 150 175 200 225 250

(a) Determine the operating point for this pump with this system.

(b) The actual flowrate required by the process is 75 m3h –1 . If the overall efficiency of the pump at this flowrate is 70%, determine the power consumed when the liquid being pumped has a density of 1250 kgm–3 .

(c) A second pump is available which has the following characteristics:

Pressure (KPa) 400 395 390 380 370 360 345 320 305 280 255
Capacity (m3h-1) 0 25 50 75 100 125 150 175 200 225 250

For the same flowrate (75 m3h –1 ), this pump has an overall efficiency of 75%.

(i) Determine the power used by this pump at a flowrate of 75 m3h –1 .

(ii) Would it be a better choice? Give reasons for your answer.

(iii) What other factors should be considered before a final choice is made?

Please can you write clearly as sometime i struggle to read what has been put and please can you be very detailed (put why you cancel something out, where a figure came from that wasnt provided etc) as i have seen a similar question answered with 5 different answers and none of them are the answers from an equation that they give.

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Expert Solution

samet mamat answered 1 year ago
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