Dynamic

Capacity varies with head.

Centrifugal

Low to medium specific speed.

Horizontal

Single stage overhung, process type

Impeller cantilevered beyond bearings.

Horizontal

1

Low

Most common style used in process services.

Two stage overhung, process type

2 impellers cantilevered beyond bearings.

"

2

Low

For heads above single Stage capability.

Single stage impeller between bearings

Impeller between bearings; casing radially or axially split.

"

1

Low

For high flows to 330 m head

Chemical

Casting patterns designed with thin sections for high cost alloys; small sizes.

"

1

Medium

Low pressure and temperature ratings.

Slurry

Large flow passages, erosion control features.

"

1

High

Low speed: adjustable axial clearance.

Canned

Pump and motor enclosed in pressure shell; no stuffing box.

"

1

Low

Low head-capacity limits for models used in chemical services.

Multistaged, horizontally split casing

Nozzles usually in bottom half of casing.

"

Multi

Low

For moderate temperature-pressure ratings.

Multistage, barrel type

Outer casing confines inner stack of diaphragms.

"

Multi

Low

For high temperature-pressure ratings.

Vertical

Single stage process type

Vertical orientation.