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Principles of naval engineering - Historic Naval Ships Association

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IChapter 12- PROPULSION STEAM TURBINESHIGHPRESSUREVALVES2HIGH PRESSURE STEAMV////A INTERMEDIATE PRESSURE STEAMLOW PRESSURE STEAMEXHAUST STEAMFigure 12-23,— Flow <strong>of</strong> steam in Type IV propulsionunit (cruising turbine in use).147.98the operating personnel. The fuel performanceratio is the ratio <strong>of</strong> the am.ount <strong>of</strong> fuel oil usedas compared to the amount <strong>of</strong> fuel oil allowedfor a certain speed or steaming condition.The fuel performance ratio, which is reportedon the Monthly Summary, is a general indication<strong>of</strong> the ship's readiness to operate economicallyand within established standards. Indetermining the economy <strong>of</strong> a ship's <strong>engineering</strong>plant, the same consideration is given to337

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