A tanker loads at a terminal within the tropical zone. She will enter the summer zone five days after departing the loading port. She will burn off about 45 tons/day and daily water consumption is 8 tons. How many tons may she load over that allowed by her summer load line?
• Load line zones and how the tropical freeboard compares to the summer freeboard • How fuel and water consumption affect displacement and draft over time • Why only the period before entering the summer zone matters for extra loading
• First, think about what happens to the ship’s weight each day as fuel and water are used. Is the ship getting lighter or heavier over time? • Ask yourself: For how many days can the ship legally take advantage of the greater tropical freeboard before she must comply with the stricter summer load line? • How should you combine the daily fuel and water figures to find the total change in displacement over those days?
• Be clear that this question is asking for tons above the summer load line, not the total cargo carried • Confirm the net daily weight loss by considering both fuel burned and water consumed together • Multiply the net daily weight change by the correct number of days in the tropical zone before entering the summer zone
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