Determining the weight of a cargo while on board a vessel
The draught survey is the way the weight of a cargo on board a vessel is measured. Specially trained and highly qualified inspectors employed by Inspectorate are used to the complexities of determining the weight of cargoes on board a vessel. There are many elements and variable to be taken into account. For example, the draught marks allow a draught surveyor to measure how deep the vessel lies in the water which permits the displacement of the vessel and its cargo to be calculated.
However, there are many factors here that also impact on the vessel. These include the salinity of the harbour water, which will vary from port to port. On board measurements need to be taken from the ballast tanks to assess the impact of those on vessel weight. The ballast can have a significant impact depending on the density of the liquid used; seawater has a different density to fresh water. Inspectors will need to establish the ‘constant’, which is difference between the theoretical and the calculated weight of the vessel weight of the vessel and is made up of various weights such as sludge, stores and the crew. This forms part of the vessel’s history.
Key Benefits of Bureau Veritas' Draught Surveys
- Independent check on weight of material, loaded or discharged
- Qualified and experienced surveyors
- Independent and experienced personnel are based in all key ports worldwide
- Enhanced product value
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