What does the term "fuel oil gelling" refer to?

The term "fuel oil gelling" refers specifically to the solidification of heating oil at low temperatures. This phenomenon occurs because certain types of fuel oils, particularly those with a higher paraffin content, can change their physical state in cold environments. When fuel oil cools down significantly, wax crystals can form, which leads to the gel-like consistency of the oil. This gelling can create operational issues, such as clogging filters and lines, resulting in reduced efficiency or operational failures in heating systems.

Understanding this process is crucial for anyone working with heating oil, especially in regions with cold climates where fuel management is essential for maintaining heating systems. Recognizing the risk of gelling helps technicians and operators take preventative measures, such as using additives or choosing appropriate types of fuel oil that are less susceptible to gelling under low-temperature conditions.