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HI: Hydraulic Institute

HI, the Hydraulic Institute, is a nonprofit organization that develops and publishes pump standards. Headquartered in Parsippany, United States, HI membership includes most major U.S. pump manufacturers as active members. With HI standardization efforts closely linked to those of several other SDOs, HI influence goes on to spread far beyond even its own robust membership. Standards from HI are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: or 1-212-642-4980 or Request Proposal Price.

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ANSI/HI 14.6-2016

Rotodynamic Pumps for Hydraulic Performance Acceptance Tests

This standard covers hydraulic performance tests for acceptance of rotodynamic pumps (centrifugal, mixed flow, and axial flow pumps). It is intended to be used for pump acceptance testing at pump test facilities, such as manufacturers pump test facilities or laboratories only. Industry experience shows that it is very difficult to perform measurements accurate enough to satisfy the acceptance requirements in this standard when testing is performed in the field. Information in the standard may be applied to pumps of any size and to any pumped liquids behaving as clear water.

ANSI/HI 9.6.4-2016

Rotodynamic Pumps for Vibration Measurement and Allowable Values

This standard pertains to evaluation of vibration when the vibration measurements are made on nonrotating parts (bearing housings) of rotodynamic pumps. It provides specific maximum allowable vibration values measured on bearing housings of rotodynamic pumps in field and factory test environments.

ANSI/HI 9.8-2012

Rotodynamic Pumps for Pump Intake Design

This standard applies to the design of new intakes as well as the modification of existing designs

ANSI/HI 11.6-2012

Rotodynamic Submersible Pumps: for Hydraulic Performance, Hydrostatic Pressure, Mechanical and Electrical Acceptance Tests

This submersible pump test standard represents a major departure from the previous submersible pump test standard (ANSI/HI 11.6 - 2001) in that the submersible pump is guaranteed and tested as a complete close-coupled unit. If pump efficiency or pump power has been guaranteed, then the pump wire-to-water efficiency or electric input power is guaranteed and tested, in addition to the mandatory flow and head test.

ANSI/HI 3.6-2016

Rotary Pump Tests

This standard recognizes various performance test levels designed to permit a reasonable selection of tests, tolerances, and accuracy requirements appropriate for the application and the customer's needs.

ANSI/HI 1.3-2013

Rotodynamic Centrifugal Pumps for Design and Application

This standard is for rotodynamic centrifugal, regenerative turbine, and Pitot tube pumps of all industrial/commercial types except vertical single and multistage diffuser pump types. It includes design and application.

ANSI/HI 9.6.2-2015

Rotodynamic Pumps for Assessment of Applied Nozzle Loads

This standard includes recommendations for assessment of applied nozzle loads for the following pump types. When specified by the user, pumps supplied shall conform to these requirements. a) Horizontal end suction single stage (ANSI/ASME B73.1, B73.3, and B73.5M) b) Vertical in-line single stage (ANSI/ASME B73.2) c) Axial split case single and two stage d) Vertical turbine short set pumps

ANSI/HI 9.6.3-2017

Rotodynamc (Centrifugal and Vertical) Pumps - Guideline for Allowable Operating Region

This guideline discusses the effects of operating a rotodynamic pump continuously or for a long duration at rates of flow greater than or less than the pump's best efficiency point (BEP) rate of flow.

ANSI/HI 9.6.7-2015

Rotodynamic Pumps - Guideline for Effects of Liquid Viscosity on Performance

ANSI/HI 9.6.7 outlines the method for predicting performance of rotodynamic pumps in Newtonian liquids of viscosity greater than water. The standard applies to single and multi-stage rotodynamic pumps having radial impellers ns = 60, (Ns = 3000), handling liquids exhibiting Newtonian behavior, and a kinematic viscosity greater than 1 and less than 4000 centistokes.

ANSI/HI 9.6.1-2017

Rotodynamic Pumps Guideline for NPSH Margin

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.


As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.