Royal Boskalis, the Netherlands


The company selected the M/V Coastway, a dredger then located in Bahrain, to check the capacity of XBEE diesel particulate filter cleaner to reduce greenhouse gas emissions. The first measurement campaign was done on July 19, 2008, for the baseline and the second one on December 15 the same year.


Clear reduction of fuel consumption and gas emissions

E2 average

Comparison of Results

Several parameters can affect the test results, besides the fuel additive. To name a few:
• Climate conditions
• Power fluctuation
• Actual power level
• Cooling and lubricating system
• Fuel quality
• Fuel supply


• Although the accuracy and repeatability of the performed tests is not fully satisfactory, the measurements indicate that the fuel additive XBee affects the engine performance in a positive manner.
A large decrease of CO at all power levels is measured.
• The measured reduction of NOx is significant, however, this is a difficult component dependant on many variables, amongst others ambient conditions. A standard conversion has been applied to correct for these circumstances.
• The observed reduction in specific fuel consumption is questionable due to the accuracy of the measured power, fuel rack, and fuel pump characteristics. However, the measurements also show that more CO2 per MT fuel and less CO is produced, which can indicate that the fuel combusts more efficiently.
• The inspection of the turbine and fuel injectors does not clearly point out that the engine is cleaner.
• Assuming that the price of XBee is about $ 30,000 per m3 and that a reduction in fuel consumption of about 1.4 % can be achieved, XBee becomes financially attractive when the price for a delivered MT of MDO is higher than $ 642.


Royal Boskalis Westminster

Papendrecht, Netherlands