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Case Study: Vessel Evaluation - MGO/MDO

Comparable data sets from bollard pull tests* monitoring a CAT 18-cylinder engine on a large Bureau Veritas classed vessel.


Data was collected to establish baseline readings of the vessel, in terms of power and torque

produced per litre of fuel consumed, under normal operating conditions, and then with the

addition of SulNOxEco™ Fuel Conditioner for comparison.


Test Results: Dramatically improved engine efficiency The increases in power and torque produced per litre of fuel is clear and consistent at different throttle percentages. It is possible that there is some clipping of the torque data from 75% to 100% power settings, with the meter reaching what appears to be its max 10,000 Nm reading.


The results demonstrate that using SulNOxEco™ Fuel Conditioner provides

significantly better engine running with lower exhaust, oil and coolant temperatures,

meaning reduced emissions, whilst producing more power and torque output.


Details of the evaluation:

  • Measurements were based on four throttle settings, 25/50/75/100%. These settings directly control the flow of fuel, with a higher % meaning more fuel is fed to the engine. Whilst this makes direct comparisons of total consumption impossible, the output of the engine per litre of fuel consumed at each % throttle setting gives an ideal proxy.


  • Outputs monitored were engine power, torque and temperatures. In a real-world scenario (i.e. not a bollard pull) these outputs directly relate to the speed and time taken to travel from point A to point B in a vessel.


  • If the vessel is producing more KW power and Nm Torque when using SulNOx with the same fuel flow (as determined by the throttle setting), then it follows that in practice throttle setting can be lowered, and thus fuel flow rate also lowered, to achieve the same power as pre-SulNOx use, at a correspondingly reduced fuel consumption.



*Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft. It is

defined as the force (in tonnes force, or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and 4 sufficient depth and side clearance for a free propeller stream.







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