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A watertight hatch with the door dogs clearly visible Three types of doors are commonly used between compartments. A closed watertight door is structurally capable of withstanding the same pressures as the watertight bulkheads they penetrate, although such doors require frequent maintenance to maintain effective seals, and must, of course, be ...
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.
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.
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.
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.
The hatch covers and the edges of the hatch openings, however, tended to warp or get bent in use, destroying the watertight seal. Later vessels had hatch coamings . While this was an improvement, it was not enough to make up for the relatively small size of the hatches: because the sides of the boats curved in, the hatches were not as wide as ...