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