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Draft formula pdf

welcome to this video about drafts away well job surveys used to calculate cargo loaded or discharged if it is conducted in a right way the accuracy can be within 0.5 percent of the cargo well a draft survey involves careful reading of drafts taking into account all the prevailing circumstances now let us first understand about hydrostatic draft well draft at the center of flotation is called hydrostatic draft the center of flotation is the point about which the ship trims so here this is the vessel and this is the point here about which the vessel trims so we can say the vessel trims like this at some point so the hydrostatic draft is the draft at center of flotation and this is very very important because all the hydrostatic particulars like a displacement TPC that distance per centimeter MC TC that is moment to change the trim by 1 centimeter LCB longitudinal center of buoyancy LCF longitudinal center of floatation KB that is centre of buoyancy from keel and that is meta Center transverse meta Center and this one a longitudinal metacenter so all the hydrostatic particulars in a ship stability booklet are tabulated against the hydrostatic draft and that is the Draft at a center of flotation and center of flotation is the point where the ship trims so if the vessel is that even keel trim is 0 and the draft is the high static draft so in case of even-keel it is pretty easy to find the initial hydrostatic draft and from the table we can also find the initial displacement if we look at this table here suppose draft was three meter we can find the displacement as five four seven eight done similarly if I have the initial hydrostatic draft so I can easily find the initial displacement now if I have some cargo and I load the cargo like this the ship goes like this so I have final hydrostatic draft and similarly I can find the final displacement all I know now that if I have the initial displacement and I add something which is the cargo I have loaded or subtract if any I have consumption or I add something like if I loaded some ballast also or loaded some bunkers also I have the final displacement and this equation is very very useful I can easily find the quantity of cargo loaded with this equation and that is the basic principle of jobs away so our objective is to find the hydrostatic draft well we need to read the draft from all six positions that means on the forward port side and starboard side midship port side and starboard side and aft also port side and starboard side the drafts are read to the nearest a centimeter that is that can be seen so these drafts are corrected to the centerline so if I have the port side draft and starboard side draft so I need to take...