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Its the marking on the ship's hull indicatiing how deep the ship will be under water in special sea condition .for example because of density differnce between salt water and fresh water , a ship will sink differently in terms of water level on the hull so this markng is produced to show the level of water in different climates when its fully loaded .
It’s the level of the ship at a certain load to calculate the free board and the draft. It’s the intersection of the sea level and she ship hull and can be read on the marks put on the front of the ship.
Shipping lines mark as well as the surface marker must be painted white or yellow on a black or any dark color background and a sign of the surface placed a length of 300 mm line and a thickness of 25 mm, and the middle of this line is the middle of the length of the ship between the two columns and upper edge of this line represents the measurement point free order; The circle shipping line marker which defines the sign Plimsol mark put down the roof line so that the distance Banalhafh upper surface and the center of the circle is to be free limit line summer load appropriated. To the front side of the center of the circle and the After 540 mm different shipping lines are placed, which describes the maximum draft of vessels for certain seasons own time zone, loading lines placed a thickness of 25 mm and the upper edge of each of them is the measurement limit.
And Load Lines describes as follows: Download Summer Line S: It is an extension of the line equitable Department Plimsoll. Winter W loading line: It falls under the summer load line a distance of 1 ÷ 48 of the sunken loading the summer. Tropical load line T: Tops loading Summer line a distance of 1 ÷ 48 of the sunken loading the summer. Loading line to the North Atlantic WNA: It falls for the winter load line a distance of 50 mm, which illustrates the ships length of 100 m Oooql. Download Summer fresh water line F: Above the load line by the summer to allow for fresh water. Download summer line of tropical fresh water TF: Above the load line tropical by allowing fresh water
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