This study was conducted to analyze the fire risk in facilities within a petrochemical plant. We confirmed the chemicals used within the petrochemical plant and the hazardous substances and special combustibles stipulated in firefighting laws (Hazardous Materials Safety Management Act and Framework Act on Fire Services). Based on the confirmation results, an actual-scale fire experiment was conducted by constructing wood crib hazardous materials based on the equivalent calorific values of cumene and phenol used in petrochemical plants. In the experiment, a measurement location was selected, and the temperature and heat flux were measured. The fire spread distance was estimated based on the fire spread on the surface of the combustible material and the radiant heat effect of the fire plume, and the variation in flame height with separation distance was analyzed.