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Engine

Bunkers, fuel, propeller and generators, from the third engineer to the chief.

7 pagesThird Engineer – Chief Engineer

  1. Third Engineer

    1.Bunker figure: from the gauged volume to tonnes in airBunkers are figured as weight in air = GSV × (density at 15 °C − 0.0011); the VCF brings the warm oil to 15 °C; the 0.0011 turns the weight in vacuum into the weight in air.
  2. 2.Propeller apparent slip: engine distance against the logApparent slip = (engine distance − log distance) ÷ engine distance × 100, using the distance through the water, never the one over the ground, and always dividing by the engine distance.
  3. 3.Specific fuel oil consumption: fuel per kWh of brake powerSFOC = fuel burned in the hour (g) ÷ brake power (kW); you divide by the brake power she developed that hour, not the shaft power or the rated output.

  4. Second Engineer

    4.Generator margin: how much more load before the preferential tripsMargin = rating × trip fraction − the load carried, machines on the bars only; the preferential trips shed load before the nameplate is reached.
  5. 5.Sulphur content of a blended tank: a mass balanceA blend's sulphur is a mass balance, (m₁ × S₁ + m₂ × S₂) ÷ (m₁ + m₂); two percentages are never simply averaged.

  6. Chief Engineer

    6.Burning sludge on passage: incinerator hoursIncinerator hours = (residue − what must stay in the tank) ÷ the throughput for that feed; every hour goes into the Oil Record Book.
  7. 7.Engine power with one unit out: the limit goes on what is leftWith a unit out, the engine may run at (MCR − one unit's output) × the limit fraction; the limit goes on what is left, not on the whole MCR.