Hydraulic Institute Standards

HI is a pump association of positive displacement and rotodynamic, centrifugal pump manufacturers and suppliers.
HI standards cover pump design and applications, installation, operation and maintenance, pump testing, definitions
and nomenclature and address such topics as allowable vibration, pump efficiency, nozzle loads, pump piping,
viscosity correction and more.

Applied Flow Technology first joined HI back in 2005 as an associate member. Today, our participation includes:

Committee Members

AFT employees are members of the new Waterhammer Advisory Committee,  Pump Viscosity Correction Standard ANSI/HI 9.6.7, and many more.

Webinar Presenters

Several AFT employees present webinars each year pertaining to waterhammer and other pumping system related topics. Our webinars have excellent participation.

Conference Participation

AFT attends regularly attends the HI Annual Conference, Technical Conference, and Fall Conference. We are often session presenters and exhibitors.

HI Standards Used in AFT Fathom (as of 2-8-22)

ANSI/HI 9.6.7

  • Effects of Liquid Viscosity on Rotodynamic (Centrifugal and Vertical) Pump Performance
  • Pump viscosity corrections
This standard outlines the method for predicting the performance of rotodynamic pumps in Newtonian liquids of viscosity greater than water. The scope of this guideline is the rotodynamic radial flow pumps of overhung (OH) between bearing (BB) or vertical (VS) type of conventional design, within the allowable operating range, pumping Newtonian fluids.
ANSI/HI 9.6.7
ANSI/HI 9.6.7

ANSI/HI 12.1-12.6

  • Rotodynamic (Centrifugal) Slurry Pumps
  • Slurry pump de-rating
This standard covers the definition, design and application, installation, operation and maintenance, and specific testing of centrifugal slurry pumps. Slurry pumps are used for pumping and/or transporting mixtures of solids and liquids. Slurries are often abrasive and, if not considered, may cause high wear and shortened life of pumps. Unlike clear water, slurries alter the performance of the pumps and cause wear to the wet-end parts. Below a certain velocity, some slurries also settle out in the piping, causing blockages. These differences are such that if they are not taken into account, the pumps will not work satisfactorily or not at all.

ANSI/HI 9.6.3-2017

  • Guideline for Operating Regions
  • Calculation of AOR and POR

This standard defines the preferred operating region (POR) for rotodynamic pumps based on pump specific speed. Additionally, factors that are considered in the setting of the allowable operating region (AOR) are detailed, and the effects of operating away from the pumps best efficiency point (BEP) are discussed. This standard applies to all rotodynamic pump and markets. It aids the specifying engineer and pump system designer to design a design the system and select pumps that will operate efficiently and reliably. 

ANSI/HI 9.6.3-2017
ANSI/HI 9.6.3-2017


  • Rotodynamic Pumps for Pump Intake Design
  • Pump Submergence calculation
This standard applies to the design of new intakes as well as the modification of existing designs used with rotodynamic pumps. It outlines standard intake designs based on certain criteria, beyond which requires a physical model study to be in compliance with the standard. 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, at a lower hydraulic efficiency and result in poor relialbity.

ANSI/HI 6.1-6.5

  • Reciprocating Power Pumps For Nomenclature, Definitions, Application, And Operation
  • Acceleration head loss calculation
This standard is a basic overview on reciprocating power pumps, design and application considerations related to the selection of the right pump for specific industry use as well as pump operating and maintenance procedures. The standard addresses a variety of reciprocating power pumps in these categories: horizontal (single /double acting – piston / plunger, simplex/duplex/multiplex) and vertical (single / double acting – piston / plunger, simplex/duplex/multiplex)
ANSI/HI 9.6.3-2017

HI Guidebooks (as of 2-8-22)

Pump Life Cycle Costs: A Guide to Lcc Analysis for Pumping Systems – 2nd Edition

Pump System Optimization: A Guide for Improved Energy Efficiency, Reliability, and Profitability

Pump Systems
Body of

Guideline for
Variable Speed

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