ClassNK identifies hidden source of fuel waste
ClassNK researchers have identified a hidden source of fuel waste and engine wear in rough seas that shipping companies may be overlooking: a persistent “speed gap” between commanded and actual main engine speeds.
As explained, when engine orders exceed what the engine can realistically achieve under heavy weather, the governor injects excess fuel in an attempt to close the gap, leading to inefficient combustion. This mismatch, while recognized by engineers, had not previously been quantified in terms of fuel loss and maintenance impact.
ClassNK’s study shows that fuel waste can reach 10–12% during severe conditions, with some trade routes, such
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