API Maxum OH2

API 610 Compliant End-Suction Pump

Our horizontal end-suction pump, specifically designed to meet the needs of the hydrocarbon processing industry.

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HI Approved

API Maxum OH2

The API Maxum OH2 is designed for optimum reliability, featuring rugged construction and state-of-the-art mechanical design. Units are well suited for applications that include petroleum refining/production/distribution, petrochemical/chemical processing, boiler circulation/high- temperature applications, and general industrial use. A workhorse in the industry, these pumps are designed for years of service, in some of the toughest environments imaginable.

This model is fully compliant with latest edition API 610 specifications. Standard features include renewable casing wear rings, API 610 seal chamber sized to accommodate 682 mechanical seals, back pull-out construction, dynamically-balanced impellers, heavy-duty carbon steel/finned bearing housing equipped with labyrinth-type oil seals, and fan cooling. Locations are also included for temperature probes, as standard. Common options include single, double or tandem mechanical seals, and various seal flush systems. Heavy-duty baseplates, casing jackets, and various levels of performance testing are also available.

Together, these features combine to produce some of the most efficient hydraulics in the industry and shaft deflection values meeting or exceeding those of API 610 requirements. The API Maxum OH2 is also available as an OH1 design for lower temperature applications.


Flows To

11,500 US GPM

3,136 m3/hr
Heads To

720 FT.

220 m
Efficiencies To


Power To

900 HP

670 KW
Speeds Up 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.



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 API 682 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 600° F in centerline mount configuration. The cooling fan also extends bearing life.



Minimal shaft deflection extends mechnical seal and wear ring life.




API Maxum OH2

2023 (5 MB)

Technical Manuals

11th Edition API Maxum - IOM (1 MB) Download
10th Edition API Maxum - IOM (2 MB) Download
API Maxum OH2 – Units Built September 2019 – Current - IOM (2 MB) Download
API Maxum OH2 Before August 30, 2019 - IOM (2 MB) Download
API Maxum OH2 Techbook - (7 MB) Download

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