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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.
Hatch cover clearance – Hatch cover clearance refers to how many "High Cube" (height over 8.6 ft (2.6 m)) containers allowed to load in the hold without preventing the hatch cover from closing correctly. [3] Visibility – The number of High cube containers shouldn't exceed a set number of High cube containers in each row/bay on-deck.
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 holds are box shaped to fit containers and some holds can be equipped with tweendecks to improve flexibility of cargo mixture in same hold. Holds are typically equipped with dehumidifier for sensitive cargo. 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 ...
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.
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.
After the covers were lifted off and placed aside using the hatch crane, the cargo could be dumped into the three holds, which would normally take 3–4 hours to complete. They were unloading used Hulett cranes, which reached into the bottom of the holds and grab 10-15 tons per bite, much like a large playground crane.
SD18 ships had aft superstructure and machinery, and four cargo holds with a capacity totalling 24,345 cubic metres (859,700 cu ft) grain (i.e. loose material). The most forward cargo hold had a hatch with McGregor single-pull hatch covers, the other three cargo holds had double hatches, which were also sealed with McGregor single-pull hatch ...