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Draught calculation
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Dear convert-me.com forum visitors,
Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.
All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page
Thank you for being with us and sorry for any inconveniences this could caused.
2 posts
• Page 1 of 1
Draught calculation
by venu » Tue Apr 26, 2005 6:33 pm
like to know in 1 mtr river draft how much tonnage can load.
- venu
by Guest » Tue Apr 26, 2005 7:28 pm
Complex question. When empty, the boat or barge already draws some water from its own weight.
If the sides are straight in the empty condition, as cargo is loaded, the water displaced is the surface area at the waterline x distance submerged. That displacement multiplied by the density of water has to match the tonnes of cargo.
Fresh water at 4 degrees C is 1 tonne per cubic meter. Actual temperature or ocean water (salinity) affect the calculation slightly.
Bottom line, you have to know the waterline area of the vessel, and the change in waterline area as the draft increases from empty draft. It obviously varies from vessel to vessel, and the only general rule is a tonne of cargo has to be offset by a tonne of additional water displaced
If the sides are straight in the empty condition, as cargo is loaded, the water displaced is the surface area at the waterline x distance submerged. That displacement multiplied by the density of water has to match the tonnes of cargo.
Fresh water at 4 degrees C is 1 tonne per cubic meter. Actual temperature or ocean water (salinity) affect the calculation slightly.
Bottom line, you have to know the waterline area of the vessel, and the change in waterline area as the draft increases from empty draft. It obviously varies from vessel to vessel, and the only general rule is a tonne of cargo has to be offset by a tonne of additional water displaced
- Guest
More info
2 posts
• Page 1 of 1