Maxum OH1

Heavy-Duty, Horizontal End-Suction Pump

Our heavy-duty, horizontal end-suction pump for handling hydrocarbons and process industry applications, includes flows up to 11,000 GPM.

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HI Approved

Our heavy-duty Pump

Designed as a foot-mounted version of our API centerline-mounted Maxum OH2, the Maxum OH1 is an industry workhorse. The Maxum OH1 can be motor, engine, or turbine-driven and is ideal for water, hydrocarbons, caustic and acid applications. With hydraulic performance to 11,000 GPM and 720 feet of head, this pump family is available in carbon steel, 12% chrome, 316L and duplex stainless steel, according to standard API material codes. In addition to these, higher alloys such as Alloy 20, Hastelloy B or C, Monel and titanium are also available.

As standard these units come with oil-lubricated bearings with labyrinth isolators, and connections for temperature probes. Common options include various cartridge seals and API piping systems. Flanged or NPT auxiliary connections, cooling jackets, spacer couplings, and various levels of performance testing are also available, depending on users’ requirements. Available heavy-duty baseplates result in maximum flange loadings that meet or exceed the requirements of API 610. With some of the most efficient hydraulics in the industry, the Maxum series offers reliability, low lifetime cost, and lasting value that has made Carver one of the most trusted names in pumps.


Flows To

11,000 GPM

2,498 m3/hr
Heads To

720 Ft

220 m
Efficiencies To


Power To

900 HP

670 kW
Speeds To

3,550 RPM

Temperatures To



Hydraulic Coverage



Materials of Construction

Design Data




Class 300 ANSI flanges with centerline discharge assist in self-venting.


Wear Rings

Replaceable casing and backhead wear rings maintain efficiency and balanced axial loads.



Back pull-out design with registered fits and fully confined gaskets assure sealing and alignment of critical fits. Casing drains included as standard. Centerline mount options available in OH2 configuration.



Enclosed, high-efficiency impellers balanced to ISO 1940, Grade G2.5 for vibration-free operation. All impellers are keyed to shaft.


API 610 Seal Chamber

Provides an ideal seal environment for both single/dual, pressurized/unpressurized cartridge mechanical seals. A full range of piping plans is also available to maximize seal life.


Bearing Frame

Heavy-duty bearing housing with cooling fins, fan and labyrinth seals keep oil clean and cool for greater bearing life.


Bearing Lubrication

Oil-lubricated bearings with standard flooded or optional flinger lubrication. Conversion to purge oil mist or pure oil mist is possible without additional machining.


Cooling Fan

Cooling fan allows ambient temperatures to 110° F and fluid temperatures to 300° F. The cooling fan also extends bearing life.



Minimal shaft deflection extends mechnical seal and wear ring life.




Maxum OH1 Brochure

2023 (6 MB)

Technical Manuals

Maxum OH1 – Units Built after January 2023 - IOM (12 MB) Download
Maxum OH1 – Units Built after July 2017 before February 2023 - IOM (2 MB) Download
Maxum OH1 Techbook – Units Built after July 2017 - (5 MB) Download

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