Draft Survey
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The vessel draft survey calculate the displacement of the vessel both before and after the loading or unloading, with the resulting difference between the two displacements representing the amount of cargo loaded or discharged. Our surveyors work according to defined international guidelines when determining the weight of the cargo and consider several key factors while making their surveys.
These factors include:
- Water density of the sea, river or other waterway
- Changes in the ballast quantity between initial and final draft readings
- Changes in the vessel’s consumables (e.g. fuel oil, drinking water) between initial and final draft readings
- Trim and deformation corrections (we use data from the vessel’s draft tables)
The accuracy of a weight determined by draft survey also depends upon the sea conditions (pitch and swell) at the time of loading or discharge. |
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