Investigators develop a thorough understanding of the system to be analyzed. This can be accomplished by studying design drawings, equipment specifications, literature and operation procedures, and related information. The fault tree is constructed. The fault tree begins with the top event and addresses any possible equipment failure, human error or environmental factors that could result in the top event. Undeveloped events are not further addressed.
Basic faults are the primary cause of the top event.
They represent an equipment malfunction that occurs within the environment in which the equipment was intended to operate. Each branch of the fault tree eventually should end in either a basic fault or an undeveloped event. Triangles are used to transfer the tree to another location or page. Feedstocks, products and byproducts of pyrolysis are flammable and pose many severe fire hazards. Benzene, which is produced in small amounts, is a known carcinogen.