Sounding of Tanks The process of quantifying the quantity of liquid present inside a tank is called “sounding”. We all are aware of storing water in head/gravity tank in our house. Frequently we ensure the level of water is maintained by checking the level in the tank. We fill up the water to the required level and stop filling. We can also say that we “sound” the tank level. In the same way, a ship’s fuel oil (bunker) tank or cargo oil tank has to be checked for its increase/decrease of its lev