Chapter 7

Question 1

SOLAS Regulation of D/D, EDD (Draw Diagram)

Answer 1

According to SOLAS regulation, every vessel has to undergo two dry docks within a period of 5 years. A ship in dry dock is a ship out of service. In order to deal with this situation, all major classifications societies have a special program called the Extended Dry-Docking (EDD). Under extended dry-docking program, ships have a privilege to extend their dry docking period from 5 to 7.5 years by replacing some dry dockings with in-water surveys (IWS)

Question 2

Factors affecting Blocks (D/D)

Answer 2

Initial height of the block: If the placement and height of the blocks are according to the ship’s hull, the load distribution will be even.

Contact area of the block: If the contact area of the block is smaller in size, this means the load exerted on this block will be lesser than that with a larger contact area.

Material of the block: Different materials will react differently to the load exerted by the ship.

Placement of the block: The blocks in the dry dock need to be arranged as per the docking plan of the ship as there is equipment that can get damaged if the block position is not positioned properly; e.g. echo sounder, anodes, etc.