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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.
During its production run the Watkins 36 became the flagship of the company product line and its features were incorporated in the newer and smaller boat designs that followed it, including the opening ports, Bomar hatches, through bolted flanged hull joints and the sloping cabin top.
There are O-ring materials which can tolerate temperatures as low as −330 °F (−200 °C) or as high as 480 °F (250 °C). At the low end, nearly all engineering materials become rigid and fail to seal; at the high end, the materials often burn or decompose. Chemical attack can degrade the material, start brittle cracks or cause it to swell.
Soft gasket is a term that refers to a gasket that is cut from a soft (flexible) sheet material and can easily conform to surface irregularities even when the bolt load is low. Soft gaskets are used in applications such as heat exchangers , compressors, bonnet valve and pipe flanges.
Barrier nets catch the wings and fuselage of an aircraft and use an arresting engine or other methods such as anchor chains or bundles of woven textile material to slow the aircraft down. On some land-based airfields where the overrun area is short, a series of concrete blocks referred to as an engineered materials arrestor system (EMAS) is ...
Head gasket with a leak between the rightmost and centre cylinders. A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head ...
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