Draft Survey

The “Draft Survey” is a method used to determine the weight of bulk goods loaded or unloaded from a vessel. It is based on Archimedes' principle, which states that an object immersed in a fluid experiences a vertical thrust equal to the weight of the displaced fluid.

The Draft Survey process involves measuring the vessel's drafts before and after loading or unloading goods. The difference between these drafts is used to calculate the volume of water displaced by the vessel. Considerations such as the density of water are then applied to determine the weight of the goods.

However, obtaining accurate results using this technique requires technical knowledge and solid experience on the part of the Damage Commissioner or the personnel in charge of carrying out the calculation. There are several factors that must be controlled and taken into account, as they can affect the measurements obtained. These factors include the density of the water, the trim of the ship (weight distribution along the ship), the trim of the ship (change in draft due to uneven loading or unloading), weather conditions and fuel level, among others. others.

Therefore, it is essential to have trained and experienced professionals in conducting Draft Surveys to obtain accurate and reliable results. These experts must consider all relevant factors and apply any necessary corrections to ensure an accurate measurement.