11. pressure surge due to water hammer is computed to be 100 psi. If the minimum

Question

11. pressure surge due to water hammer is computed to be 100 psi. If the minimum working pressure is The 50 psig, what would the minimum pressure in the pipe be under surge conditions? Note: the pipe is at sea level. 12. Net Positive Suction Head for a pump (circle the single best answer): a. Is related to the maximum pump head a pump can generate. b. Is related to the maximum pressure that can be at the intake (eye) of a pump. c. Is related to the minimum pressure that is required at the intake (eye) of the pump. d. Can e. None of the above be either positive or negative. 13. How is the occurrence of cavitation typically detected in pipelines and valves? Cavitation tyrically occurs either as the result of an increase n the kinetie enexy r an inorease n the pipe elention

Explanation / Answer

Answer-12- (c)- is related to the minimum pressure that is required at the intake of pump

Net Positive Suction Head is minimum pressure required at the suction port of the pump to keep the pump from cavitating.

Answer 13-

1-Loud noise often described as a grinding or “marbles” in the pump

2-Loss of capacity (bubbles are now taking up space where liquid should be)

3-Pitting damage to parts as material is removed by the collapsing bubbles

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