indentations,sea chest anchor and chain etc

1             a)   Describe possible faults which may be found during a dry dock inspection of the following and the remedial action taken.

1. Hull indentations                   
2. Anchor and chain                   
3. sea chest                              

hull indentations-

the primary factors to be considered in assessing the effect of indents are as follows

• measure the area and depth od the indentation and record in shell expansion drawing check Whether internal structural members in way.

• Whether internals in way are significantly affected i.e. tripped or adrift from bottom plating. Smooth sccttered indent with small depth with the internals remain intact can be left after the recording. If the depath is large renewal of the section with the similar plate having minimum 300x300mm  should be done any damaged or detached internals must be renewed.

 Anchor and chain

Identification of repairs are done after laying in dock bottom. Washing ,removal of any rust makes it easier for the inspection and caliberation

If the wear down is exceeded the recommended value those chain length are to be renewed with similar chain lengths with classification certificates .

Any missing lugs are to be replaced and loose lugs are to be re welded  joining shakeles securing arrangement and the pin and their end sealing arrangement with lead is checked

Anchor is checked for worn out fluke pin worn out shank pin and hole weight measurement is requirement in some classification societies

A           Steam outlet pipe section inside the sea chest corroded and wasted

B.             Pipe connecting the sea chests are thinned down or erroded (stub pieces are thinned down )

C.               Usually vent pipe is find chocked due to the small pipe diameter  the pipe get chocked

D.             In high sea sucion  upper area corrosion due to the accumulated air in the sea chest may find if the vent               holes are not provided on the top

E.           Sea chest top plates from the engine room side may get thin down due to the water leakages of glands and        accumulated water.

F.            Fouling

G.            Mgps sytem not funtioning

lll          locking arrangements of the gratings   wasted anodes   

 thhic  thickness measurement of sea chest plats and stub pieces should be done overhauling all opening mounted on the sea chest is done steam discharge line should be check anodes fitted are renewed. securing arrangements of the gratings are checked and ensure anodes are uncovered before fitting back the gratings.

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