What is the routine anchor windlass maintenance?

a. Brake drum should be free of oil, grease and other deposits. The brake drum should
be cleaned periodically with a solvent prescribed by the maker
b. The brake drum and the disk should be checked for wearing out or damage
c. Gear oil should be checked for contaminants and level
d. The direction of tensioning should correspond to the correct operation of the brake. As
the reverse direction for tensioning would render the brake ineffective, check should
be carried out to ensure the same
e. Brake test of the windlass is to be carried out to the pressure mentioned by the
maker on the jack tool. If necessary, the spring tension adjusted. It should be done in
guidance of the instructions and in the tensioning direction. The number of turns on
the drum should also be checked and should be same as to the makers quote
f. The securing device of the tension spring adjust should be checked periodically for
any tamper
g. Anchor windlass testing should be carried out to check the efficiency of the windlass.
The windlass should raise the anchor with chain from 82.5m to 27.5m at a mean
speed of 9m/min
h. The foundation of the windlass should be checked
i. Other routines of the prime mover should also be carried out like for the windlass
electric motor or the hydraulic motor as the case may be

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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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