OHH Overhung Single Stage Pumps

The OHH is our API 610 (ISO 13709) Type OH2 overhung, horizontal, centerline mounted, single stage, radially split process pump. It has the broadest performance range in the industry and is used in heavy-duty refinery, petrochemical, gas processing and offshore oil production services.


Main benefits

  • Finned bearing housing and fan cooling for long bearing life
  • Broadest range map in the industry for ISO 13709 (API 610) type OH2 pumps
  • Heavy Duty baseplates with 2x ISO 13709 (API 610) nozzle load option
  • ISO 21049 (API 682) cartridge type mechanical seals for reduced emissions
  • Electric motor or steam turbine drivers

Main applications

  • Seawater booster for critical services
  • High-temperature vacuum bottoms
  • Low pressure unit charge
  • Light Vacuum Gas Oil (LVGO) and Heavy Vacuum Gas Oil (HVGO)
  • Fractionation bottoms

Main design features

  • Robust shaft for minimal deflection
  • Casings designed for 2x ISO 13709 (API 610) nozzle loads
  • Oil ring, purge mist or pure oil mist lubrication available
  • 300 # flange rating standard. 600# optional
  • 11,000 Net Suction Specific Speed (NSS) standard
  • Optional improved suction performance on most sizes

Key characteristics


Up to 2,250 m3/h / 10,000 US gpm


Up to 360m / 1,200 ft


Up to 75 bar / 1,100 psi


From -75 to 425°C / -100 to 800°F

Discharge sizes

From 25 to 400 mm / 1 to 16 inches

Maximum speed of rotation

Up to 3,600 rpm

Performance range

Performance range 50 Hz

OHH performance range 50 HzClick to zoom

Performance range 60 Hz

OHH performance range 60 HzClick to zoom

Switch to tab Documents