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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. The protective metal sheeting or plating protecting against water entry into ventilation shafts in large ships is called a coaming as it fulfills the same water-deflection purpose.
The lightweight all aluminum frame, including the chassis, makes Livin Lite's towable products atypical in the RV industry. Even Airstream, with its aluminum shell and monocoque construction, utilizes a heavier steel chassis and builds its trailers on top of a wood floor. Floor rot and rusted frames are big problems in recreational vehicles ...
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.
As larger and larger submarines were made, and eventually fitted with periscopes, this protrusion grew into a small pressure-hull of its own, typically connected to the control room inside the boat's main pressure-hull via a watertight hatch to mitigate the risk of flooding if the viewports or periscopes were damaged. Thus, the conning tower ...
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.
Stainless steel was widely used for springs, retainers, sleeves and glands. Single and multiple seal arrangements were used as necessary to accomplish the required performance. In 1957, Sealol introduced the edge welded metal bellows seal. Previously, metal bellows seals had used a formed bellows which was much thicker and stiffer. [7]