L8 - LECTURE 8 Cavitation in pipelines and in pumps...

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1 LECTURE 8: Cavitation in pipelines and in pumps, NPSH (net positive suction head) 8.1 Cavitation in Pipelines Whenever, pipeline axis is above HGL, negative pressure exists. (Page 112) Vertical distance measured between EGL and HGL Vertical distance measured between HGL and Pipe axis Pipe axis level at summit point Pipe axis level at point A Total Head for point summit Total energy; = = h = EGL HGL H = + ( )
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2 At the submit point, S: and is a fixed positive value “ NEGATIVE PRESSURE EXIST IN THE PIPELINE WHENEVER THE PIPELINE RAISED ABOVE THE HYDRAULIC GRADIENT LINE” Total Head Negative pressure reaches a maximum value at the summit , ( ) Water flow from S to R must flow against pressure gradient. Water always flows toward lower-energy locations. The difference in elevation between S and R should be It is important to maintain pressure at all points in a pipeline above the vapor pressure of water. Vapor pressure of water a negative water column of 10 m at 20 0 C. When the pressure in a
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