Draft / Deadweight Surveys

All your maritime needs with

one maritime family

Draft Surveys can improve your shipping accuracy with a wide range of commodities, including grains, cement, coal, iron ore, and fertilizers.

Draft Surveys determine the weight of the cargo aboard the vessel. A draft survey can save substantial costs for the interested party.  These surveys are done to ascertain the quantity of a bulk cargo loaded or discharged by reading the vessel's drafts, measuring the ballast water, fuel, diesel oil, and other liquids on board, and calculating the final quantity by using the vessel's approved dead-weight scales and tank tables.

Our global network of highly qualified draft surveyors operates to a defined draft survey protocol, resulting in accurate draft weights for you at load and discharge points. Dependable and consistent draft weights allow you to monitor and control shrinkage while limiting the financial risks associated with bulk cargo transactions.

In principle, draft surveys require only a measurement of the water displaced by the vessel before and after the cargo is transferred, along with a measurement of the water’s density. Water displacement is measured through draft marks on the ship and converted to a volume using draft tables. The weight of displaced water is calculated by multiplying its volume (displacement) by its density.

 

The difference between the weights of water displaced before and after the cargo transfer will equal the weight of the fertilizer within measurement accuracy limits.

In practice, draft surveys are complicated procedures that require a highly qualified draft surveyor.

Overall accuracy will depend on the surveyor’s skill in dealing with:

checkmark.png

The varying density of sea or river water

checkmark.png

Accuracy of the ship’s draft tables

checkmark.png

Changes in the quantity of ballast between initial and final draft readings

checkmark.png

Condition of the vessel’s draft markings

checkmark.png

Changes in consumables on the vessel between init,ial and final draft readings (fuel oil, potable water, etc.)

checkmark.png

Weather and sea conditions at the time of reading (pitch and swell)

checkmark.png

Allowance for trim, list and deformation corrections (IME uses data from the vessel’s draft tables)

checkmark.png

Weight of the cargo loaded when compared to the total capacity of the vessel

checkmark.png

Weather and day-light

IME has trained draft surveyors who work on a defined draft survey protocol. Raw data are filled into a spreadsheet format, which then calculates the weight loaded or discharged. This result is reviewed before being released to you and the raw data is preserved for further review.

We also perform Deadweight Surveys to determine the amount of cargo a vessel could have loaded if all the available space were utilized to determine the loss of freight due to the short shipment of cargo.

IME - White.png

When experience is needed, trust the experts.

Head Office Address

Building N°0750-D Williamson Place, La Boca Balboa, Ancon Panama, Rep. of Panama P.O. Box 0843-02416 Balboa, Panama Republic of Panama.

Menu

Contact Us

+507 314-1756 / 52