On tankers, the measurement of cargo quantity loaded is simple. We know the density of the cargo and we know the volume. It is easier to know the weight of the cargo loaded.

But with cargoes like coal, urea, phosphate or any bulk cargoes, we cannot measure the weight by just measuring the height of the hold to which cargo is loaded.

This is because unlike liquids, solid cargoes would not take the shape of the hold.

Calculating the cargo loaded with draft survey is the most appropriate way.

But it isn’t only with solid cargoes. Sometimes we have to measure the cargo quantity of liquids by draft survey. One such cargo is molasses.

This cargo has air within it, and thus the density of this cargo is not uniform. Calculating the weight of this cargo using the way we calculate the weights for other liquids will give wrong quantity, so; the draft survey is the solution in this case too.

We measure the vessel’s draft at forward, middle and aft, make sounding for all ballast, fresh water and sewage tanks, taking the figure for bunker and others from C/E to find out the vessel’s constant using  internationally recognized methods and modern equipment for measuring the necessary variables for an accurate outcome.