The conversion of hydrocarbons to chemical agents is made by “the petrochemical” industry, which is a corner stone of industry and present technologies. The “petrochemical plant” produces plastics, medicines, textiles, kitchen items among many other things that nowadays are considered “normal” and “necessary” (computers, fabrics, toys etc). From petroleum are obtained certain compounds that are the base of diverse productive chains that produce a wide range of products termed petrochemicals which are used for fertilizers, plastics, nutrition, pharmaceuticals, chemicals and textile products, among others. The main petrochemical chains are those of natural gas, light olefins (ethylene, propylene and butylenes) and aromatics. To guarantee the Reliability of the processes of this industry is vital for the harmonious operation of the industries that depend on its products.