OHHL Low Flow High Head Pumps

The OHHL is our API 610 (ISO 13709) Type OH2 low-flow horizontal overhung process pump. It covers the low-flow end of the OHH range map. The unique low-flow impeller design provides gap-free coverage for low-flow, high-head applications. The bearing frame and mechanical seals from OHH are utilized to minimize spares inventory.


Main benefits

  • Stable head-capacity curves achieved with unique low-flow impeller-diffuser design
  • Low-flow, high-head gap-free coverage
  • Heavy-duty baseplates with 2x ISO 13709 (API 610) nozzle load option
  • ISO 21049 (API 682) cartridge type mechanical seals for reduced emissions
  • Interchangeable parts reduce spares inventory

Main applications

  • Seawater booster for critical services
  • Pump around services
  • High head makeup services
  • Light hydrocarbon boosting
  • Light Vacuum Gas Oil (LVGO) and Heavy Vacuum Gas Oil (HVGO) services

Main design features

  • Unique low-flow impeller-diffusers create stable H-Q curves
  • Robust OHH bearings, bearing housing and isolators
  • ISO 21049 (API 682) mechanical seals interchangeable with OHH pumps
  • Casings designed for 2x ISO 13709 (API 610) nozzle loads
  • Grouted, non-grouted or pre-grouted baseplates are available

Key characteristics


From 1 to 60 m3/h / 4 to 260 US gpm


From 20 to 450m / 65 to 1 500 ft


Up to 51 bar / 740 psi


From -75 to 425°C / -100 to 800°F

Discharge sizes

From 25 to 50 mm / 1 to 2 inches

Maximum speed of rotation

Up to 3,600 rpm

Performance range

Performance range 50 Hz

OHHL performance range 50 HzClick to zoom

Performance range 60 Hz

OHHL performance range 60 HzClick to zoom

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