• Rotodynamic Pumps Guideline for NPSH Margin (ANSI/HI 9.6.1-2017)

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Item #: B118
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Description  more details

Scope of Standard: Today’s higher speed, higher energy density pumps might not achieve acceptable service life without an adequate NPSH Margin that ensures pumps operate without excessive vibration and cavitation. ANSI/HI 9.6.1 serves as a guideline for NPSH margin for rotodynamic pumps with absorbed power levels up to 5300 hp and impeller tip speeds less than 130 feet per second. The purpose of this guideline is to establish recommended net positive suction head available (NPSHA) above the published NPSH required (NPSHR) that will lead to acceptable pump performance and service life.

What You Will Learn/Overall Benefits:

  • Understand why it is essential to specify an appropriate NSPH Margin
  • Know requirements of pump design to ensure performance (i.e. pumps sensitive to water react differently in cold water vs. oil)
  • Learn about the negative aspects of specifying an excessive NPSH Margin

Applicable Markets:  This standard applies to all markets worldwide. Specific recommendations are provided for the following applications:

  • Petroleum (hydrocarbon) process pumps
  • Chemical process pumps
  • Electric power plant (non- nuclear) pumps
  • Nuclear power plant pumps
  • Water/wastewater pumps
  • Pulp and paper stock pumps
  • Building services
  • Slurry pumps
  • Oil and gas industry pumping applications
  • General industrial pumping applications

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ISBN: 978-1-935762-57-7
Pages: 33
Approval Date: 2017
Table of Contents: View in PDF format
Also available in secure PDF: View now

Content:  NPSH definition, NPSH margin considerations related to inlet tip speed, larger impeller eye, suction specific speed, impeller vane overlap, pump size, construction materials and duty cycle, change in NPSHA with time, rotative speed limitations in water/ wastewater pumps.

Who Should Buy This Standard:  OEMs, specifiers, end users and engineering consulting companies that should know requirements of pumps to ensure long-term performance.

New Content in 2016 Version:

  • Updated definitions
  • More NPSH margin consideration factors
  • Removed Rotative speed limitations, water and wastewater pumps content from Appendix A to its own appendix


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