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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.
The large M/D Center Section (1) covers most of the hatch to protect it from the meteoroid/debris environment. It has several straps and openings, depending on installed location. Most covers have a flap (2) over the hatch window, as seen here during STS-120. The flap is restrained by "hook and loop" closure, held with a snap.
Hatch dogs around a door on the R/V Knorr. The watertight doors that allow passage through bulkheads between compartments inside a ship can be closed during emergencies to seal off one compartment from another, thus isolating flooding, smoke and heat from adjoining compartments. The objects that are wedged against the door to hold it closed are ...
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]
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 "cross-hatch" pattern is used to retain oil or grease to ensure proper lubrication and ring seal of pistons in cylinders. A smooth glazed cylinder wall can cause piston ring and cylinder scuffing. The "cross-hatch" pattern is used on brake rotors and flywheels. [citation needed]
A crosshead as part of a reciprocating piston and slider-crank linkage mechanism. Cylindrical trunk guide Hudswell Clarke Nunlow; crosshead and two slide bars. In mechanical engineering, a crosshead [1] is a mechanical joint used as part of the slider-crank linkages of long stroke reciprocating engines (either internal combustion or steam) and reciprocating compressors [2] to eliminate ...