Skip to main content

Action to be taken in case of electrical failure during sailing

  • In the event of loss of main power, there would be an immediate shut down of main propulsion, which would lead to dangerous situation, if they were to be manoeuvring in narrow congested water or near coast line.
  • Although the emergency generator would start and come on load it is not possible to restart the main engine till the main alternators are restarted and taken on load.
  • Communicate with bridge and if vessel is under manoeuvring in high traffic zone then exhibit the "NUC" signal.
  • Raise engineers call alarm. All engineers to proceed to E/R.
  • If stand by generator has not started, start same and take on load. Make sure to keep enough reserve air in the Main Air Bottles to start the other Generators if required or to start the ME which might be required in heavy traffic areas. Run the Emergncy air compressor and fill up the Emcy Air Bottle. Keep an eye on Running of Emcy Equipment.  
  • Confirm sequential start of all essential M/C or start same.
  • Change over M/E control to ECR & reset trips. Resetting of Governor in some cases is required as it gets stuck on a Blackout Situation. This same should be in SMS manual.
  • Restart the plant and confirming all in order, restart M/E after confirming from bridge.
  • Make report of failure and log in E/R log book. Manke sure all time and events are logged and the same are in the Deck Log Book as well.
  • Check continuously for the running generators parameters.

Comments

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as minor is along the  direction of maximum stress.

Shell Expansion Plan

It is a two dimensional drawing of a three dimensional surface of the ship’s hull form. This plan is very useful for the following information:It is used for marking the location of a hull Damage on this plan by identifying the strake number , letter and frame number so that the exact location of the damage and also suggested repairs are marked in a localised copy. The shell expansion can be used for finding areas of painting surfaces such as topside, boot topping and bottom areas by applying Simpsons rules directly.  In the shell expansion the vertical scale used is different from the horizontal scale and a suitable adjustment has to be made when calculating areas. This becomes useful in solving disputes concerning areas of preparation and painting. It gives information on the thickness of the original strake which is indicated by the number in the circle shown in the strake.  The quality of steel used is also shown by letters A,B,D E and AH, BH,DH, EH.