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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.
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.
A key aspect of container ship specialization is the design of the hatches, the openings from the main deck to the cargo holds. [41] The hatch openings stretch the entire breadth of the cargo holds, and are surrounded by a raised steel structure known as the hatch coaming. [40] [41] On top of the hatch coamings are the hatch covers.
Hatch cover clearance; Visibility; The stowage plan shows cross sections of the ship bay by bay, to indicate where all the containers should be loaded. The plans change with each port of call as container are discharged or re-stowed and new containers are taken on board. [3] [14]
A hatch or hatchway is the opening at the top of a cargo hold. The mechanical devices which allow hatches to be opened and closed are called hatch cover. In general, hatch covers are between 45% and 60% of the ship's breadth, or beam, and 57% to 67% of the length of the holds. [4]
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.
For this purpose there is a long sliding hatch-cover above the bow section for access to the vehicle deck. There are no facilities for helicopters. The Soviet Navy commissioned a total of 28 ships of this type from 1975 to 1991. The last three ships were of the improved variant Project 775M, also called Ropucha II.
Although he secured his ship's deck, Captain Albert Stiglin did not have his crew place tarpaulins on the twelve leaf-type "Telescoping" hatch covers; since these were not watertight, they allowed some water to seep into the cargo holds. Around 8 pm one of the leaves on the number 11 hatch worked loose and allowed water to pour into the hold.