You have 420 tons of below deck tonnage and 150 tons of above deck cargo on board. You must load 135 tons of liquid mud below deck. How much more deck cargo can you load? See illustration D036DG below.
• USCG stability loading diagram with below deck vs. above deck tonnage • How adding liquid mud below deck shifts your point along the horizontal axis • Using the curve boundary between SAFE LOADING and UNSAFE LOADING to find the maximum allowable deck cargo
• After adding the 135 tons of mud, what is your new total below deck tonnage and where does that place you on the horizontal axis of the graph? • From that new below‑deck value, if you move straight up to the safe‑loading boundary curve, what is the maximum above deck cargo value shown on the vertical axis? • Once you know the maximum allowable above‑deck cargo from the curve, how do you compare it with the 150 tons you already have to find how much more you may load?
• Be sure you add the 135 tons of liquid mud to the below deck total only, not to the deck cargo. • Read the scale carefully on both axes; the graph is in long tons, not metric tons. • Confirm that your final point (new below‑deck total, total deck cargo) lies on or below the safe‑loading curve, not in the "UNSAFE LOADING" area.
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