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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.
MacGregor steel hatch cover Robert MacGregor was a British engineer , who, during the 1920s, concerned over unnecessary losses of North Sea colliers , developed the first steel hatch cover. The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch.
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.
A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
The lid itself has two layers: an inner layer made of vertical planks, providing structural integrity and watertightning, and an outer layer made of horizontal planks that integrates into the outer hull. A short roof above the gun port offers some protection from the elements, and prevents the lid from jamming against the hull.
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.