• Procedures Adopted to Ensure Safety During Dry Dock:

Firefighting equipment ready at all times.
Fire detectors and fire alarm in good working condition.
CO2 total flooding system door is locked to prevent accidental actuation.
Safety gear worn while working- safety shoes, helmet, overalls, safety goggles, ear mufflers, and gloves.
Escape routes should be clearly marked.
Proper working permits obtained before carrying any work on board; e.g. hot work permit, enclosed space entry permit.
All lifting gears checked to be in good working condition.
Safety lamps are used - never use a naked lamp.
Co-ordination of work, so no chemical cleaning and hot work around boiler area is done at the same time.
No transfer of oil carried out in dry dock.
No boiler blow downs; in emergency, necessary notice given.
Acetylene and oxygen bottles are properly stored and secured.
Fire officer at site of work and extinguishers available.
No unauthorized personnel or chemicals allowed on board.
Ship properly grounded to shore earth.
Fire line is always ready with 2 hydrants open if no hull work is carried out.
Safety meetings should be carried out every morning before stating the work in dry dock.

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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.

MEOclassIIexamnotes

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