It is good practice to fill a vessel to what percentage with liquid?

Filling a vessel to approximately 80% with liquid is considered good practice in various refrigeration and storage applications. This practice is based on several factors, including the need to allow for thermal expansion of the liquid, which occurs as temperatures change.

When a liquid is heated, it expands and may produce vapor. By leaving space in the vessel, it allows for this expansion without creating excess pressure that could lead to safety hazards such as leaks or pressure relief events. Additionally, leaving 20% of the vessel’s capacity empty helps to accommodate fluctuations in liquid levels due to operational changes and ensures that the liquid can move freely without risking overfilling.

Maintaining an 80% fill level strikes a balance between maximizing the use of the vessel’s capacity while ensuring safety and operational efficiency.