You have 700 tons of below deck tonnage including liquid mud. Your existing deck cargo is 200 tons with a VCG above the deck of 3.0 feet. What is the maximum additional cargo tonnage you are permitted to load? See illustration D036DG below.
• Use the loading diagram (D036DG): below-deck tonnage is on the horizontal axis, deck cargo on the vertical axis, with a boundary between SAFE LOADING and UNSAFE LOADING. • Instruction 1 on the diagram: draw a vertical line up from the given BELOW DECK load, and a horizontal line across from the ABOVE DECK load; the intersection must lie on or below the limiting curve. • Instruction 2: the maximum deck cargo VCG is 3.0 ft above the deck, which matches the condition in the question.
• At 700 tons of below-deck tonnage, where does your vertical line hit the safe/unsafe boundary curve on the loading diagram? What is the corresponding maximum deck cargo on the vertical axis? • Once you know the maximum allowable deck cargo from the diagram at 700 tons below deck, how do you use your existing 200 tons to figure out the extra tonnage you can still load? • Does your final deck cargo amount place you in Zone I on the diagram, and if so, what special condition from the notes would apply (even though it doesn’t change the numerical answer)?
• Be sure you are reading LONG TONS on both axes, not metric tons or short tons. • Confirm that the point representing your final total deck cargo and 700 tons below deck lies on or just under the curve, not above it. • Verify that you have subtracted the existing 200 tons from the maximum allowable deck cargo from the diagram to get the additional tonnage, rather than trying to work directly from the curve.
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