It is interesting to observe that although the fuel consumption of this dredger has been reduced by 9.84% according to the E2 test cycle, such ships mostly work on loads ranging from 25 to 50%. Taking this into account, the specific fuel consumption is reduced by an average of 13.81%.
According to MM. Smits and Meijer at Boskalis:
- 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.
- The measured reduction of NOx is significant […]
- 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.
Interestingly, the authors of the report chose to minimize the results by basing their calculation of the break-even point fuel price on the lowest reduction of fuel consumption, i.e. 1.4% at 75% load. Even so, such break-even point is set to about $665 per ton of fuel considering prices in 2023.
If we take into account the actual reduction of fuel consumption by -9.84%, XBEE Enzyme Fuel Technology is completely paid when you treat fuel that cost more than $91.4 per ton!