In this paper, through the analysis of fires in the Rijeka oil refinery, the facility for primary distillation of crude oil treats the extinguishing of flammable liquids. Flammable fluid fires represent a number of specificities that make them a separate class of fire. Knowledge of the physical and chemical properties of flammable liquids, the types and characteristics of extinguishing agents and techniques, and the tactical appearances of interventions with flammable liquids is a necessary prerequisite that should be fulfilled in order to make the best possible analysis of specific events. Therefore, the first section is dedicated to the units visited. The concept of fire extinguishing analysis is designed to enable the description of all relevant information on the installations visited, from the central administration and sources of danger to the extent of fire and explosion protection. This is followed by a reconstruction of the event, which chronologically lists all procedures and actions related to the work of the fire forces, from the notification to the completion of the firefighting. The analysis ends with an evaluation of each individual work and a process of ongoing interventions with the allocation of potential better solutions. The conclusion of the paper combines all factors related to raising the level of professionalism, which ensures greater efficiency in interventions in the most credible way.