Draught survey - Secomar

A draught survey is a precise and widely recognized method for determining the weight of cargo loaded or discharged from a vessel.

The process involves measuring the vessel’s draft — the depth to which the ship sits in the water — both before and after cargo operations.

By analyzing these measurements and applying corrections for factors such as trim, water density, and ballast conditions, the surveyor can accurately calculate the displacement difference, which corresponds to the cargo’s weight.

Draught surveys are essential in bulk cargo operations, where precision and transparency are critical. They provide an independent and objective assessment of cargo quantity, helping shipowners, charterers, and cargo interests avoid disputes and maintain accurate documentation for commercial and legal purposes.

Our team of experienced marine surveyors conducts draught surveys in compliance with international standards and industry best practices, ensuring reliable, traceable, and verifiable results. Whether for loading, discharge, or internal quantity checks, we deliver accurate data that supports informed decision-making across all types of bulk and general cargoes.

Why is a draught survey important?

A draught survey ensures accurate cargo weight measurement, helping prevent losses, discrepancies, and contractual disputes between shippers, charterers, and receivers.

How accurate is a draught survey?

When performed by skilled surveyors under proper conditions, a draught survey can achieve accuracy within 0.5% to 1% of the cargo’s actual weight, depending on vessel condition and environmental factors.

When should a draught survey be conducted?

A draught survey should be performed before loading (initial reading) and after loading/discharge (final reading) to determine the cargo quantity transferred during the operation.