Remember Law of Archimedes,
The mass of a floating body of vessel including ship + bunkers + stores + consumables + cargo, was equals the mass of the displaced volume.
Don't forget the main steps of draft survey as follows:
1. Reading the draft
2. Correction to perpendiculars
3. Mean-draft calculation for hull deformation
4. Calculation of corresponding displacement
5. Displacement correction for the effects of trim and list (First, second trim correction, list correction, last if required)
6. Displacement correction for water density
7. Measurement of liquids on board. ie ballast sounding (measuring)
8. Soundings trim correction
9. Liquids volume calculation
10. Measuring the density of sounded/measured liquids
11. Calculation of weight of liquids in ship’s tanks
11. Determination of constant: Constant=Displacement-Light Ship-Weight of Liquids
12. Weight of loaded/discharged cargo calculation as the difference between final and initial draft surveys
If you want, i have formula for calculation draft survey, it easy to use and applicable for beginner surveyor, Junior surveyor andd senior surveyor or everyone who interest about draft survey,
please email to
ruly.abdillah@gmail.com with subject Draft Survey Calculation.
