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.

Answer 1

1) Design the pump suction piping and routing to avoid excess turbulence
2) Reduce the temperature of water
3) Operating the pump at low speed so to avoid more turbulence
4): When net postive suction head is less than that requires
Then cavitation occurs
5) increases as pump head fall
6)Reduce the impeller diameter will lower pump head by 4 times
So larger diameter is needed to get large head and to avoid cavitation

Hence to avoid cavitation

Option A,D,E should be applied