Grundfos centrifugal pumps perform well with low sulphur fuelMay 02, 2011
Grundfos centrifugal pumps perform better with low sulphur fuels than gear pumps and screw pumps because they can better cope with low-viscosity fluids, according to an article from The Motorship, a marine technology magazine. Pump manufacturer Grundfos' traditional gear pump and screw pump systems can falter when attempting to maintain required pressures and capacities with low-viscosity, low-sulfur fuel oils.
The company notes because centrifugal pumps don't need lubrication from a pumped liquid, the lower viscosity doesn't increase the wear or maintenance costs. The centrifugal pumps are also not affected by debris in diesel fuel because its moving parts don't come into contact with each other.
Kim Kirkegaard, Grundfos' business development manager, said that as the fuel changes character, so should the pump. ”The centrifugal pump is best at low viscosities, the screw pump is best at high viscosities," she said. "As we move from high to low, we must go to the product that is designed for low viscosity liquids. That’s the centrifugal pump. In theory, a centrifugal pump can last forever on low sulphur fuels."
According to Kirkegaard, the Grundfos CRN centrifugal pump with MAGdrive is ideal. The pump is hermetically sealed against leaks, with no physical connection between the pump and motor. Magnets drive the shaft and impellers. “When you have a sealed pump, you don’t get oil on the deck,” says Kirkegaard. “You keep your engine room clean.”
The Grundfos Blueflux pumps are said to comply with the third phase of the EU energy standards, due to enter into force in 2017, as well as current 2011 regulations, and to be certified for marine use.