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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: StandardsSubscriptions@ansi.org or 1-212-642-4980 or Request Proposal Price.

Below are HI's best-selling standards. To find additional standards, please use the search bar above.

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ANSI/HI 9.8-2018

Rotodynamic Pumps for Pump Intake Design

Ideally, the flow of liquid into any pump should be uniform, steady, and free from swirl and entrained air. Lack of uniformity through inlet connection can result in pumps not operating to optimum design condition and at a lower hydraulic efficiency. This technically advanced standard discusses the proper design for rectangular intakes, formed suction intakes, circular pump stations, trench-type intakes for clear liquids and for solids-bearing liquids, tanks – pump suction, can vertical turbine pump intakes, unconfined intakes, and circular plan wet pit for solids-bearing liquids.


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 9.6.1-2017

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.


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 14.3:2019

Rotodynamic Pumps for Design and Application

The purpose of this standard is to provide guidance and recommendations for the general application and design of rotodynamic pumps. This standard provides accepted methods for the evaluation of the hydraulic performance and design of all related and supporting equipment.


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 9.8-2012

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 14.1-14.2:2019

Rotodynamic Pumps for Nomenclature and Definitions

This standard is for types, nomenclature, and definitions of rotodynamic pumps with radial, mixed flow, and axial flow impellers, as well as regenerative turbine, Pitot tube, vertical diffuser, submersible motor deep-well and shortset pumps, commonly defined as vertically suspended rotor and vertical overhung impeller types (that may be driven by vertical electric motors or horizontal engines with right-angle gears) of all industrial/commercial types.


ANSI/HI 14.4-2018

Rotodynamic Pumps for Installation, Operation, and Maintenance

This standard applies to IOM manuals for all rotodynamic pumps For additional instructions on sealless rotodynamic pumps, see ANSI/HI 5.1-5.6 Sealless Rotodynamic Pumps for Nomenclature, Definitions, Application, Operation, and Test For additional information on rotodynamic pumps types, see ANSI/HI 14.1-14.2 Rotodynamic Pump for Nomenclature and Definitions.


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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.

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