Draft Survey

At Libra Marine, we provide accurate and independent Draft Survey services to determine the quantity of cargo loaded or discharged on board vessels.

Draft Surveys are a widely accepted method for calculating bulk cargo quantities by measuring the vessel’s displacement before and after loading or discharge. This process is essential for shipowners, charterers, traders, and terminals to ensure transparency, prevent disputes, and verify contractual obligations.

Our experienced surveyors carry out precise draft readings, density measurements, and stability calculations, ensuring that all variables are correctly assessed. The final results are presented in clear and reliable reports accepted by all relevant parties.

With strong operational coverage in Houston and Miami, Libra Marine delivers fast and dependable draft survey services across major U.S. ports.

Our Draft Survey Services Include:

• Initial and final draft readings
• Lightship and deadweight calculations
• Seawater density measurement
• Ballast, fuel, and freshwater corrections
• Cargo quantity determination (loading/discharging)
• Trim and list corrections
• Ullage and tank soundings (if required)
• Detailed reporting with calculation sheets