Fairbanks Nijhuis

BiFlow Pumps - BF Series

During loading and off-loading of ships the anti-heeling and ballast system is in full operation and crucial for the duration of the process. Since time is money, ship owners desire a quick turn around when in ports. The Pentair Fairbanks Nijhuis' innovative anti-heeling/ballast BiFlow is the answer to this demand.

The BiFlow is a bi-directional, in-line pump/turbine. It is specially designed for the transport of large amounts of ballast water, in situations with limited space.


Drawing of the BiFlow ballast and anti-heeling pump


  • High capacity: 1,000 - 3,000 m³/h (4,403 - 13,208 USgpm)
  • Differential head: up to 25m (82 feet)
  • Bi-directional operation
  • In-line assembly; only one pump with  high efficiencies
  • Compact design, less pumps needed in the ballast system
  • Large performance envelope
  • Symmetrical forward and reverse performance
  • Fast control response
  • Low noise and vibration levels
  • Dry and submersible configuration

functional description


  •  Static or dynamic ballast control
  •  Ship locks and docks
  •  Bow thrusters

The BiFlow is a bi-directional, inline anti-heeling/ballast pump/turbine combination, specially designed for pumping large amounts of ballast water. The assembly is symmetrical, consisting of two counter-rotating impellers with variable speed. The driver is submerged and completely integrated.

This configuration ensures high efficiency and controlled flow in both directions to opposing ballast tanks. Compared to conventional ballast systems, the BiFlow delivers better performance with capacities up to 3.000 m3 per hour, enabling ships to ballast quickly and save considerable time and costs in port. In addition, the BiFlow saves space; it can be installed in the double bottom section of the ship, submerged or dry.

BiFlow - BF series





BF2-400.450  BF2-450.650  BF2-500.550 

 pump speed 1/min

-1500 +1500  -1200 +1200   -1000 +1000 -900 +900  -800 +800 
 nominal flow m3/h  -1150 + 1150   -1400 +1400  -1600 +1600  -2000 +2000 -2500 +2500 
 nominal head m3/h -18 +18 -16 +16   -16 +16  -16 +16   -16 +16  
 installed power kW 2x55   2x60 2x75  2x90   2x110
 connection ISODIN 300 NP10  350 NP10  400 NP10   450 NP10 500 NP10 
 LxHxB m/m 1500x570x680*  1750x670x790*  2000x760x900  2500x810x930 2500x950x1130* 
* not certified