Ullage survey method is used to determine the amount of liquid cargo such as crude oil, petroleum products, chemicals and similar loaded or discharged on tanker ships. In short, it is a weight determination method. This technique is based on measuring the empty space above the load in the tanks and making some static calculations. In this way, the weight of the cargo carried by the ship is found.

The measurement of the distance (ie the space) between the surface of the liquid in a tank and the top of the inner surface of the tank is called the ullage method. There are ullage tables on the ships. These tables are generated relative to the internal volume of a tank measured from a reference point. The reverse of the Ullage method is the sounding method (ie depth measurement method). In this method, the depth of liquid in a tank is measured from the liquid surface to some reference points at the bottom of the tank.

Ullage expression refers to the free space left in the tanks after the liquids are loaded into the tank. In general, a space is left in oil tankers for the oil to heat up and expand. This void is actually ullage. Petroleum products can expand with atmospheric temperature changes. For this reason, tanks are normally loaded with 98 percent capacity.

In short, ullage is a widely used calculation method in industrial tanks used to store liquids or tanks used to transport liquids in maritime transport. According to the legal regulations in force, pressure tanks on ships cannot be more than 98 percent full, with exceptions.

In some cases, the ullage (space) in a ship’s tanks is related to the ship’s stability. This is all about the ship’s management and management technique. Here, too, the effects of the fluctuation of the liquids in the tanks on the balance of the ship are calculated.

Ullage survey services are also provided by MARINE SERVICE within the scope of ship surveillance services.is. In this way, enterprises learn the amount of load in the tanks reliably and accurately.