![]() Trim=Frd-Aft=3,15-3,35= – 0.2 but,we must correct Trim and : I would like to check my calculated draft survey if you don’t mind which I have below.ĭiesel-45 mts, Oil-18 mts Lub oil 15 Fw-21 mts Other-12 mts, Constanta:30 mts, oil, l.oil ) what else is included ? What about the ship’s constant ? How do we know the ship’s constant before discharging ? Net displacement means the quantity of the cargo included light ship except ship’s constant. I sew these steps of calculation and wanted to ask you, in the term Deductible ballast, except the ballast quantity, bunker ( f.oil, d. In this case your vessel trim is by stern (+). This table is included all data that we need to complete the calculation.Īs the trim definition is different between aft draft and fore draft I think all necessary data was completed, so we could do calculation. The calculation is uses Displacement Table or usually called Hydrostatic Table. Using Hydrostatic Table provided onboard to begin calculation, Records all in the survey book includes with the density for Ballast and Bilges, and for Oil complete it with density and temperature. Records the water dock density as survey data.ĭetermining of deductible weights by measuring and soundingĭeductible Weight could measure by sounding the tanks which used the Sounding Tape or gauging the tank level by visual inspection. Any deductible weight such as Ballast Water, Fresh Water, Fuel and Diesel Oil, and Bilges is notify to check. Inserted the Hygrometer on to the water sample on the Sampling Can or Tube, then we could check the scale pointed on the surface of the sampling water. To determine the density of water, we need the instrument named Hydrometer or Density Meter. The sea water density is indeed at density 1.025 and the fresh water at density 1.000. Where as the water density is subject to changes which follow with water tide that carrying different water salinity and temperature on to the ship dock. Why? Because the ship draft will not be the same at different water densities (at the lower density means the ship more sink and at the higher density means the ship more float). Sampling and testing the sea water or dock water densityĪfter reading the draftmark, directly engage with the sampling of sea water or river water around the ship’s dock. The draftmark read is recorded on the surveyor notebook, do not try to remember it or write down in your palm hand. I am not saying that other processses is not essensial, but this process is hard to do and involves many rules of conduct to gain the correctness and accuracy of Draft Survey itself (I will post it later). The surveyor should be read all above marks clearly, because reading the draftmark is the first and most essential process. Use the small boat to go around the ship and get as near as possible to the draft mark for best viewing. The draftmark could be find at six (6) points on the below places: ![]() Using Hydrostatic Table provided onboard to calculation.Ĭommonly, all ship are designed with draftmark for working with Draft Survey to determined their actual weight.Determining of deductible weights by measuring and sounding of ballast tanks, fuel oil, fresh water that existing onboard at the time of survey,.Sampling and testing the sea water or dock water density at the place where the vessel floats,.Fore, Midship, and After at both sides of the ship, Reading the draftmark of the ship, which consist of six (6) points of draftmarks, i.e.The Draft Survey procedures and calculation ascertained as the following series : ![]()
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