- C/E to be informed and then inform bridge. If steaming then there is some buffer time to sort out the fault.
- Trace the alarm events in the data logger; this will give some lead to what might have been the initial problem.
- Man the E/R if UMS ship. Or Change over the boiler and see if the other is working fine on Auto.
- call for assistance and report matter to Electrical officer
- If total automation failure then run on Emergency Mode. Procedures will be laid down in the SMS Manual
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.