Hydraulic Institute (HI) has published ANSI/HI 9.6.1–2012 Rotodynamic Pumps Guideline for NPSH Margin, which serves as replacement for 1998 edition. Covering rotodynamic, general-purpose pumps with power levels as high as 5,300 hp and impeller tip speeds less than 130 fps, guideline describes benefits to pump longevity of maintaining suitable NPSH Margin. Document serves as tutorial on NPSH while also providing guidance for determining NPSH Margin.
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