- The Cross Curves Of Stability are used to determine the length of the righting arm at any angle of inclination for a given displacement.
- To draw the curve of statical stability, we need GZ values for various angles of heel.
- For this we use the GZ cross curves of stability.
- These curves are provided for an assumed KG, tabulating GZ values for various displacements and angles of list.
- Called cross curves because the various curves actually ‘cross’ each other.
- Since the curves are plotted for an assumed KG, if the actual KG differs from this a correction (GG1Sineθ) needs to be applied.
- This correction is positive if the actual KG is less than the assumed KG and vice-versa.
- After obtaining the GZ values at various angles, the curve of statical stability is prepared
Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation...
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