Pump Types
The Hydraulic Institute standardizes rotodynamic and positive displacement pump types, definitions and nomenclature. The description for each pump type and acronym, and the related industry standard are included.
Rotodynamic pumps are a class which 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. Positive displacement pumps are a class which trap and move a volume of fluid with each shaft rotation. Positive displacement pumps are divided into reciprocating types, which use pistons, plungers and diaphragms, and rotary types, which utilize meshing components, such as, screws, gears, lobes and vanes.
Index
Pump Types - Rotodynamic Overhung
| 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 Vertically Suspended
| 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 |
Pump Types - Rotary Positive Displacement
| Circumferential piston | ANSI/HI 3.1-3.5 |
| Gear type - sealless | ANSI/HI 4.1-4.6 |
| Gear, external | ANSI/HI 3.1-3.5 |
| Gear, internal with crescent | ANSI/HI 3.1-3.5 |
| Gear, internal without crescent | ANSI/HI 3.1-3.5 |
| Lobe, single | ANSI/HI 3.1-3.5 |
| Lobe, three | ANSI/HI 3.1-3.5 |
| Piston, axial | ANSI/HI 3.1-3.5 |
| Screw type - Sealless | ANSI/HI 4.1-4.6 |
| Screw, single (progressing cavity) | ANSI/HI 3.1-3.5 |
| Screw, three (untimed) | ANSI/HI 3.1-3.5 |
| Screw, two (timed) | ANSI/HI 3.1-3.5 |
| Tube, flexible (peristaltic) | ANSI/HI 3.1-3.5 |
| Vane type - sealless | ANSI/HI 4.1-4.6 |
| Vane, flexible | ANSI/HI 3.1-3.5 |
| Vane, sliding | ANSI/HI 3.1-3.5 |
Pump Types - Reciprocating Positive Displacement
| AOD | Air-operated - Bellows - simplex or duplex | ANSI/HI 10.1-10.6 |
| AOD | Air-operated - Diaphragm - simplex or duplex | ANSI/HI 10.1-10.5 |
| Air-operated - piston | |
| Air-operated - plunger | |
| CVMP | Controlled volume metering - diaphragm | ANSI/HI 7.1-7.5 |
| CVMP | Controlled volume metering - piston | ANSI/HI 7.1-7.5 |
| Piston - direct acting - single or double acting - simplex or duplex | HI 8.1-8.5 |
| Plunger - direct acting - single or double acting - simplex or duplex | HI 8.1-8.5 |
| Piston - single or double acting - simplex or multiplex | HI 6.1-6.5 |
| Plunger- single or double acting - simplex or multiplex | HI 6.1-6.5 |
Last updated on April 19th, 2024
