Currently in the world there are many hazard analysis methods Scientists have synthesized and classified about 62 hazard analysis methods, used to evaluate the hazards that may occur in industrial plants. The Fire and Explosion Index (F&EI) calculation is a tool to help detennine the areas of greatest loss potential in a particular process when incidents of fire, chemical explosion would occur. So this method is often used to evaluate the hazards causing fire or explosion due to chemicals associated with process unit. But to evaluate hazards in the activities of chemical plants, according to experts can not just use one method in 62 hazard analysis methods, that need to combine methods with each other.