Question

A reservoir has a lower water level set at 200 ft. The pump is set at an elevation of 190 ft. It was determined through analysis that an existing pump is experiencing cavitation. Which of the following will decrease the risk of cavitation? Select all that apply. A) Raise the elevation of the pump. B) Increase the temperature of the water. C) Decrease the diameter of the suction pipeline. D) Operate the pump at a lower speed. E) Increase the size of the pump impeller. Water Properties: Vapor Pressure Head Bulk Modulous of Elastidity Viscosity Temp P.IN F (Ibsec/) 32 40 50 60 70 во 90 100 110 120 130 140 150 160 170 180 190 200 212 Specific Weight Y (1b/ft) 62.42 62.43 62.41 62.37 623 6222 62.11 62 61.86 61.71 61.55 61.38 61.2 61 60.8 60.58 6036 60.12 59.83 Density P [slug/It') 1.940 1.940 1.940 1.938 1.936 1.934 1.931 1.927 1.923 1.918 1.913 1.908 1.902 1.896 1.890 1.883 1.876 1.868 1.860 3.746 3.229 2.735 2.359 2.05 1.799 1.595 1424 1.284 1.168 1.069 0.981 0.905 0.838 0.78 0.726 0.678 0.637 0.593 Kinematic Viscosity 10 (t/sec) 1.931 1.664 1.41 1.217 1.059 0.93 0.826 0.739 0.667 0.609 0.558 0.514 0.476 0.442 0.413 0.385 0.362 0341 0.319 0.2 0.28 0.41 0.59 0.84 1.17 1.61 2.19 2.95 3.91 5.13 6.67 8.58 10.95 13.83 17.33 21.55 26.59 33.9 (lb/in) 293 294 305 311 320 322 323 327 331 333 334 330 328 326 322 313 313 308 300

Answer 1

Cavitation is the formation and occumulation of bubbles! Solution: - Ofund a pump impelles. when those bubbles burst due to pressure the impellea gets canoded and reduses the efficiency of System It can be avoided by Sercaal ways 1 lowed the tempestore 9. Raise the liquid level in the Souchon vesse 3. Reduce Specific Speed. 4. Increase the diamets of the impellea S. Impelles induces. Hence, ophion is conce 기 Increase the size of the impelles",

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