Measuring apparatus

Today we took in 30 tons of gasoil.
In the extra: the bunkering barge Jaqueline that delivered the fuel.
Before and after bunkering we measure the amount of fuel in the tanks.
Today we did have enough space in the tanks; otherwise one has to measure all the time to prevent pollution.
In this article it will be made clear how to measure.
We do ullage measurement, and use a table with the tank specifications.