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Unit Conversions Kinematic & Dynamic Viscosity Conversion Pipe Friction Loss Calculator Line Shaft Bearing Loss Calculator Horizontal Tank Volume Calculator Vertical Tank Volume Calculator Spherical Tank Volume Calculator Atmospheric Pressure Calculator
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  • Definitions & Resources
    • A) Welcome & Introduction
    • B) Acronyms & Definitions
    • C) Pump Types
    • D) References
    • E) Additional Resources
  • Pump Fundamentals
    • A) Foundational Concepts
    • B) System Curves
    • C) Rotodynamic Pump Types
    • D) Rotodynamic Pump Curves
    • E) Pump Principles
    • F) Positive Displacement Pump Types
    • G) Positive Displacement Pump Principles
    • H) Positive Displacement Pump Curves
    • I) Operating Point
  • Fluid Properties
    • A) Water
    • B) Solids and Slurries
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  • Fluid Flow
    • A) Pipe Frictional Losses
    • B) Losses in Valves, Fittings, and Bends
    • C) Losses With Other Fluids
    • D) Losses in Nozzles
    • E) Losses With Paper Stock
  • Pipe, Flange & Motor dimensions
    • A) Steel Pipe
    • B) Stainless Steel Pipe
    • C) Ductile Iron Pipe
    • D) Non-Ferrous Pipe and Tube
    • E) Plastic PVC Pipe
    • F) Flange Dimensions
    • G) Motor Dimensions
  • Calculators
    • A) Unit Conversions
    • B) Kinematic & Dynamic Viscosity Conversion
    • C) Pipe Friction Loss Calculator
    • D) Line Shaft Bearing Loss Calculator
    • E) Horizontal Tank Volume Calculator
    • F) Vertical Tank Volume Calculator
    • G) Spherical Tank Volume Calculator
    • H) Atmospheric Pressure Calculator
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  • A) Welcome & Introduction
  • B) Acronyms & Definitions
  • C) Pump Types
  • D) References
  • E) Additional Resources

  • A) Foundational Concepts
  • B) System Curves
  • C) Rotodynamic Pump Types
  • D) Rotodynamic Pump Curves
  • E) Pump Principles
  • F) Positive Displacement Pump Types
  • G) Positive Displacement Pump Principles
  • H) Positive Displacement Pump Curves
  • I) Operating Point

  • A) Water
  • B) Solids and Slurries
  • C) Viscosity
  • D) Other Fluids

  • A) Pipe Frictional Losses
  • B) Losses in Valves, Fittings, and Bends
  • C) Losses With Other Fluids
  • D) Losses in Nozzles
  • E) Losses With Paper Stock

  • A) Steel Pipe
  • B) Stainless Steel Pipe
  • C) Ductile Iron Pipe
  • D) Non-Ferrous Pipe and Tube
  • E) Plastic PVC Pipe
  • F) Flange Dimensions
  • G) Motor Dimensions

  • A) Unit Conversions
  • B) Kinematic & Dynamic Viscosity Conversion
  • C) Pipe Friction Loss Calculator
  • D) Line Shaft Bearing Loss Calculator
  • E) Horizontal Tank Volume Calculator
  • F) Vertical Tank Volume Calculator
  • G) Spherical Tank Volume Calculator
  • H) Atmospheric Pressure Calculator

  • Releases
  • Members and Contributors

Rotodynamic Pump Types

The Hydraulic Institute standardizes rotodynamic and positive displacement [Link] pump types, definitions and nomenclature. The description for each rotodynamic pump type, and the related industry standard are included.

Rotodynamic pumps impart energy to the pumped fluid by means of a rotating impeller, propeller or rotor. They include centrifugal pumps, and mixed and axial flow pumps.

Index

Pump Types - Rotodynamic Overhung
Pump Types - Rotodynamic Between Bearing
Pump Types - Rotodynamic Vertically Suspended

Pump Types - Rotodynamic Overhung
Pump Types - Rotodynamic Overhung
Acronym Pump Description Reference
OH0 Overhung impeller - flexibly coupled - horizontal - frame mounted - single stage ANSI/HI 14.1-14.2
OH0c Overhung impeller - flexibly coupled - horizontal - axial flow - single stage ANSI/HI 14.1-14.2
OH0d Overhung - flexibly coupled - horizontal - frame mounted - pitot tube pump ANSI/HI 14.1-14.2
OH1 Overhung impeller - flexibly coupled - horizontal - foot mounted - single stage ANSI/HI 14.1-14.2
OH1h Overhung impeller - flexibly coupled - horizontal - foot mounted - self-priming - single stage ANSI/HI 14.1-14.2
OH1i Overhung impeller - flexibly coupled - horizontal - foot mounted - sealless - single stage ANSI/HI 5.1-5.6
OH1j Overhung impeller - flexibly coupled - horizontal - foot mounted -multi-stage ANSI/HI 14.1-14.2
OH2 Overhung impeller - flexibly coupled - horizontal - centerline mounted - single stage ANSI/HI 14.1-14.2
OH3 Overhung impeller - flexibly coupled - vertical - in-line - integral bearing frame - single stage ANSI/HI 14.1-14.2
OH3g Overhung impeller - flexibly coupled - vertical - end suction - single stage ANSI/HI 14.1-14.2
OH4 Overhung impeller - rigidly coupled - vertical - in-line - single stage ANSI/HI 14.1-14.2
OH5 Overhung impeller -close-coupled - vertical - in-line - single stage ANSI/HI 14.1-14.2
OH5g Overhung impeller -close-coupled - vertical - end suction - single stage ANSI/HI 14.1-14.2
OH5i Overhung impeller -close-coupled - vertical - in-line - sealless - single stage ANSI/HI 5.1-5.6
OH6 Overhung impeller - close-coupled - vertical - in-line - high-speed integral gear - single stage ANSI/HI 14.1-14.2
OH7 Overhung impeller - close-coupled - horizontal - single stage ANSI/HI 14.1-14.2
OH7j Overhung impeller - close-coupled - horizontal - multi-stage ANSI/HI 14.1-14.2
OH7i Overhung impeller - close-coupled - horizontal - sealless - single stage ANSI/HI 5.1-5.6
OH8 Overhung impeller - close-coupled - submersible - diffuser - end suction - single stage ANSI/HI 14.1-14.2
OH8b Overhung impeller - close-coupled - submersible - volute - end suction - single stage ANSI/HI 14.1-14.2
OH13j Overhung impeller - rigidly coupled - horizontal - foot mounted - multi-stage ANSI/HI 14.1-14.2
OH13i Overhung impeller - rigidly coupled - horizontal - foot mounted - sealless - single stage ANSI/HI 5.1-5.6
CP1 Circulator pump - close-coupled - sealless - horizontal - in-line ANSI/HI 14.1-14.2
CP2 Circulator pump - close-coupled - horizontal - in-line ANSI/HI 14.1-14.2
CP3 Circulator pump - flexibly coupled - horizontal - in-line ANSI/HI 14.1-14.2
RT1 Regenerative turbine - overhung - side channel ANSI/HI 14.1-14.2
RT2 Regenerative turbine - overhung - peripheral ANSI/HI 14.1-14.2

Pump Types - Rotodynamic Between Bearing
Pump Types - Rotodynamic Between Bearing
Acronym Pump Description Reference
BB1 Between bearing impeller - 1 or 2 stage - axially split ANSI/HI 14.1-14.2
BB2 Between bearing impeller - 1 or 2 stage - radially split ANSI/HI 14.1-14.2
BB3 Between bearing impeller - multi-stage - axially split ANSI/HI 14.1-14.2
BB4 Between bearing impeller - multi-stage - radially split - single casing ANSI/HI 14.1-14.2
BB5 Between bearing impeller - multi-stage - radially split -double casing ANSI/HI 14.1-14.2
RT3 Regenerative turbine - between bearings - side channel ANSI/HI 14.1-14.2
RT4 Regenerative turbine - between bearings - peripheral ANSI/HI 14.1-14.2

Pump Types - Rotodynamic Vertically Suspended
Pump Types - Rotodynamic Vertically Suspended
Acronym Pump Description Reference
VS0 Vertically suspended - single casing - discharge through column - submersible ANSI/HI 14.1-14.2
VS1 Vertically suspended - single casing - discharge through column - diffuser ANSI/HI 14.1-14.2
VS2 Vertically suspended - single casing - discharge through column - volute ANSI/HI 14.1-14.2
VS3 Vertically suspended - single casing - discharge through column - axial flow ANSI/HI 14.1-14.2
VS4 Vertically suspended - single casing - separate discharge - line shaft ANSI/HI 14.1-14.2
VS5 Vertically suspended - single casing - separate discharge - cantilever ANSI/HI 14.1-14.2
VS6 Vertically suspended - double casing - diffuser ANSI/HI 14.1-14.2
VS7 Vertically suspended - double casing - volute ANSI/HI 14.1-14.2
VS7j Vertically suspended - double casing - volute - multi-stage ANSI/HI 14.1-14.2
VS8 Vertically suspended - in-line casing - diffuser ANSI/HI 14.1-14.2

Last updated on August 31, 2026

Related topics

A) Foundational Concepts
B) System Curves
D) Rotodynamic Pump Curves
E) Pump Principles
F) Positive Displacement Pump Types
G) Positive Displacement Pump Principles
H) Positive Displacement Pump Curves
I) Operating Point