Solving For Allowable Increase In Draft

By how much can a ship submerge her load-line in water density 1004 kg/m³, if the her FWA is 185 mm?

Given:

Water density = 1004 kg/ m³

              FWA = 185 mm

What is asked?

Allowable increase in ship's draft

Solution:

Allowable increase is equal to the product of fresh water allowance (FWA) times the change in density, and then divided by 25 which is constant. So this is the formula:

AI = FWA × Density change 
                   25
AI = 185 mm × (1025 - 1004) 
                   25
AI = 155 mm

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