Multistage, Ring Section Pump

Our process duty, horizontal ring section multistage pump. Designed for moderate to high-pressure pumping, the RS is available in seven basic sizes with overall performance to 2,600 HP.

Talk to a pump expert


HI Approved

For Pressures to 1,500 PSI

The RS is offered with Class 300 ANSI R.F. inlet flanges and Class 600 or 900 ANSI R.F. discharge flanges, depending on the pressures and number of stages involved. Hydraulic performance extends to 2,000 GPM and 3,400 ft. TDH, making it ideally suited for the most demanding industrial and process applications.

The RS design incorporates a product-lubricated, advanced composite material, sleeve-type radial bearing at the outboard (discharge) end. The thrust bearings are two matched angular contact ball bearings located at the inboard (suction) end of the pump. An optional outboard mechanical seal with an inboard radial ball bearing is also available. The RS has oil-lubricated ball bearings, which can be water cooled. Larger units can also be fan cooled.

The available materials of construction, from ductile iron to duplex stainless steel, offer combinations suitable for all applications from general water services to light abrasives and corrosive applications. Our proprietary advanced composite material, available for wear rings and interstage bushings, offers high-temperature performance, and exceptional resistance to wear and corrosion.


Flows To

2,000 US GPM

454 m3/hr
Heads To

3,400 ft.

1,000 m
Pressures To

1,500 psig

100 bar
Temperatures From

-20° F to 300° F

-30° C to 149° C
Speeds To

3,550 RPM

Hydraulic Coverage



Materials of Construction

Design Data




17-4PH stainless steel as standard.


Ball Bearings

Oil lubricated angular contact ball bearings to handle axial thrust in either direction.


Stuffing Box

Accepts either component or cartridge type mechanical seals.



O-ring sealed casing and interstages assure leak-free operation.



Class 300 ANSI R.F. inlet flange and Class 600 or 900 ANSI R.F. discharge flanges.



Ductile iron or CD4MCuN duplex stainless steel casing as standard.


Sleeve Bearings

Radial sleeve-type bearing made of standard Carver composite material.


Optional Ball Bearing Design

Optional matched angular contact ball bearings on outboard end with grooved radial ball bearing on inboard.


Wear Rings

Replaceable front and rear wear rings at each pump stage as standard.


Interstage Bushing

Replaceable interstage bushing made of composite or hardened metal.


First-Stage Impeller

Special low NPSH first-stage impeller


Shaft Sleeves

Stainless steel shaft sleeves as standard.


Optional Cooler

Included when temperatures exceed 220° F.




RS Brochure

2023 (8 MB)

Technical Manuals

RS Series for Units after Dec 2015 – Current - IOM (7 MB) Download
RS Series – Built after July 2010 thru December 2015 - IOM (2 MB) Download
RS Series ATEX Rev 0 – Before July 2010 - IOM (2 MB) Download
RS Series S/N 164313 thru July 2010 - IOM (3 MB) Download
RS Series S/N 158587 thru 164312 - IOM (3 MB) Download
RS Series S/N 158586 and Older - IOM (2 MB) Download
RS Series Techbook - (8 MB) Download

Talk to a pump expert


Featured Story

LACT Systems in the Oil and Gas Production Region of Canada

Carver Pump was contacted by a producer in the Canadian oil and gas production region that was using 20 tanker trucks per day to transfer oil to their customers. Installing booster pumps eliminated the risks involved with over-the-road oil transfer, cut transportation costs and helped save wear and tear on roads.


Contact Our Experts

  • This field is for validation purposes and should be left unchanged.