Other benefits are an integrated power plant with the use of more efficient propellers, manoeuvrability and better employment of space due to installation flexibility.
An integrated power plant means a “Central power station" concept with the minimum of auxiliary prime movers, which can lead to a significant reduction in the total installed power, together with general use of a single fuel-grade. It is also clear that a “Total energy” concept should be adopted, witli heal, recovery where possible.
The most efficient propeller combination can be used due to the freedom of choice of speed and torque.
Examples of ship types particularly suitable lor application of superconductive drive motors are icebreakers, large tugs and tankers.
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Starting Control from ECR Navigation
By shifting the telegraph lever from FULL AHEAD to NAVIGATION, a gradual acceleration program is activated; the program is adjustable and enables the engine to reach navigation RPM’s in the desired lapse of time. If any fault occurs during gradual load take-over the engine load increase is interrupted; the engine stabilizes at the value reached at the moment in which the fault occurred and remains in that condition until the fault disappears.
Automatic resumption of power increase takes place according to the preset gradient.
If one of the stand-by causes persists beyond a given time the device automatically starts decreasing the load, beginning from stand-by position and persists until its determining cause disappears. The decrease may occur according to two adjustable speeds which are automatically selected by the programme as a function of the seriousness of the fault.
The following are some, of the anomalous conditions which determine the limiting and safety functions described above: fresh cooling water high temperature at ttie outlet of each cylinder; cylinder exhaust gas high temperature versus average value; cylinder exhaust gas mean temperature;
thrust bearing, journal bearing, stern tube bearing, crosshead bearing, and big end bearing high temperatures;
cylinder average high temperature, piston cooling fluid low flow rate;
engine luboil high temperature;
fuel injectors cooling fluid flow failure.
If any of the above variables, in particular bearing temperature and luboil pressure, reach exceptionally critical values, RPM reduction is converted to an engine lockout.
Shield push-buttons are provided both on Bridge and ECR. By means of these push-buttons some safety and protection facilities may be excluded (RPM reduction, torque limitation, acceleration gradient, engine power manual limitation).