If a product is used for ballast, to what percentage should the tank not be filled?

When using a product for ballast in a tank, it is crucial to leave a sufficient ullage, or space, above the liquid level. This practice is important to accommodate expansion, prevent overflow, and ensure proper functioning of the system. Typically, a minimum of 5% ullage is recommended to avoid any operational issues.

Therefore, if the tank is to be filled to allow for ballast purposes, it should not exceed 95% of its total capacity. This ensures that there is adequate space to account for any changes in liquid volume, such as those due to temperature fluctuations, and facilitates safe handling and operation of the system. By adhering to the 95% fill guideline, operators can maintain the integrity and efficiency of the tank, while also minimizing risks associated with overfilling.