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Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.
Six large cargo hatch covers on a capesize bulk carrier ship as she approaches the Egyptian-Japanese Friendship Bridge. A cargo hatch or deck hatch or hatchway is type of door used on ships and boats to cover the opening to the cargo hold or other lower part of the ship. To make the cargo hold waterproof, most cargo holds have cargo hatch.
Cargo hatch covers for holds are opened and closed by mean of gantry crane. Space on those hatch covers can also be used to carry containers, lumber or project cargoes. [1] Modern open hatch general cargo ships feature advanced designs to enhance efficiency and accommodate diverse cargo types.
Their small size allows Handysize vessels to enter smaller ports to pick up cargoes, and because in most cases they are 'geared' - i.e. fitted with cranes - they can often load and discharge cargoes at ports which lack cranes or other cargo handling systems. Compared to larger bulk carriers, handysizes carry a wider variety of cargo types.
A ship able to remain afloat with any two compartments flooded is called a three-compartment ship, and will withstand damage to one transverse bulkhead. [ 11 ] After the Titanic sinking , safety standards recommended spacing transverse bulkheads so no single point of damage would either submerge the end of the upper bulkhead deck or reduce ...
On container ships the position of containers are identified by a bay-row-tier coordinate system. The bays illustrate the cross sections of the ship and are numbered from bow to stern. The rows run the length of the ship and are numbered from the middle of the ship outwards, even numbers on the port side and odd numbers on the starboard side ...
Hatch coaming (bottom right) on a bugeye. Coaming is any vertical surface on a ship designed to deflect or prevent entry of water. It usually consists of a raised section of deck plating around an opening, such as a cargo hatch. Coamings also provide a frame onto which to fit a hatch cover.
The open hatch bulk carrier, often referred to as OHBC or conbulker, is designed to offer direct access to the hold through cargo hatches which extend the full width of the vessel. As a result, large cargo units can be lowered into place. If it is possible, the holds or hatches are designed around standard cargo unit sizes.