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    marinetales October 26, 2020
    The WNA mark ( Winter North Atlantic mark) is required by the ships lesser than 100 mtrs in length trading in North Atlantic Ocean during the Winter Season. During the first conference on the Loadline convention it was generally agreed that the freeboard of small ships should be especially examined with a view to some increase being made ( in freeboard) . Statistics of ship losses had highlighted the safety problems associated with vessels under 300 ft long and some action was necessary. It was recognized that it was difficult for ships lesser than 100 mtrs ( 328 feet) to (more)
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    marinetales September 7, 2020
    Oil tankers have a lesser freeboard than general cargo ships of the same LBP. They are considered to be safer ships for following reasons- 1. They have much smaller openings on the main deck. 2. They have greater subdivision 3. The cargo of oil has generally more buoyancy than the bulk cargo or general cargo 4. They have more pumps to quickly control the water ones in case of an bilging or flooding incident 5. Cargo oil has a permeability off about 5% compared to grain cargo/bulk cargo which has a permeability of about 50-60% 6. Oil tankers have greater (more)
    marinetales August 27, 2020
    Lightening holes are used to access the tank in ford/aft/athwartship direction. They also reduce the overall weight of the plates and gives strength to the overall design through the grid structure
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    marinetales August 23, 2020
    The allowable limits of Shearing Force and Bending Moments are the values which the structure of the ship is designed to take. The Ship’s capacity to bear SF and BM depends upon its sectional properties (differs from ship to ship). This capacity of the ship to take sheer and bending moment varies from one longitudinal location to other. These values are stated in the Stability Booklet of the vessel and depends upon the Classification Society Rules which lays down such requirements. The values of SF/BM are in Newton-Metre and is defined on a scale of 0% to 100% on loadicator. (more)