Type

Construction

Maintenance

Requirement

Notes

Horizontal - Overhung

1 - 2 Impellers cantilevered beyond bearings

Low

Horizontal - Single stage Impeller between bearings

Impeller between bearings, casing radially or axially split

Low

Head above 300 m

Horizontal - Chemical

Casing patters designed with thin sections for high cost alloys, small sizes

Medium

Low pressure and

temperature ratings

Horizontal - Slurry

Large flow passages,

erosion control features

High

Low speed, adjustable axial clearance

Horizontal - Canned

Pump and motor enclosed in pressure shell, no stuffing box

Low

Low head capacity limits for models used in chemical services

Horizontal - Multi staged, split casing

Nozzles usually in bottom half of casing

Low

Moderate temperature - pressure ratings

Horizontal - Multistage, barrel type

Outer casing confines inner stack of diaphragms

Low

High temperature -pressure ratings

Vertical - Single/Multistage

Low Head/stage

Low - Medium

High head capability,  low NPSH requirement

Vertical - Inline

Inline installation

Low

Low cost installation, simplified piping systems

Vertical - High Speed

Speed up to 380 rps, head to 1770 m

Medium

Attractive cost for high head/ low flow

Vertical - Sump

Casing immersed in sump for installation, convenience and priming ease

Low

Low cost installation

Vertical - Multistage Deep Well

Very long shafts

Medium

Water well service with driver at grade

Vertical - Axial (Propeller)

Propeller shaped impeller, usually large size

Low

A few applications in chemical  plants  and refineries

Vertical - Turbine (Regenerative)

Fluted impeller, flow path like screw around periphery

Medium - High

Low flow - high head performance.

Capacity virtually

independent of head