Fresh Water Allowance And Dock Water allowance Formula
A vessel has a mean draft of 25'-00", her displacement is 10000 tons and the TPI is 42. Find the increase of draft in a water density 1010 kgs/m³.
Given:
Displacement = 10, 000 tons
Water density = 1010 kgs/m³
TPI = 42
Solution:
We are going to use two formulas to solve this problem.
1. Fresh Water Allowance = Displacement
40 x TPI
= 10000 tons
40 x 42 tons per inches immersion
= 5.95 inches
2. DWA = FWA x (1025 - New Density)
25
= 5.95" x (1025-1010)
25
= 3.57" is our final answer
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