Compared with other industries, the petrochemical industry has a special importance in explosion-proof. This is mainly determined by its production characteristics.a, the petrochemical industry has many explosive sources, such as raw materials, intermediates, and finished products, most of which are flammable and explosive substances; At the same time, there are many ignition sources in the production process, such as open flame, electric spark, electrostatic spark may become the ignition source of explosion. When the mixture of flammable and explosive substances or its steam and oxygen and other combustion-support gases reach a certain proportion, the damage degree of the mixture gas is no less than the power of high explosives when it explodes in the ignition source, which determines the difficulty of the fire prevention and explosion prevention work in the petrochemical industry.b, the petrochemical production has the characteristics of high temperature, high pressure and deep freezing, and most media have relatively high temperature Strong corrosion, coupled with temperature stress, alternating stress and other effects, pressure containers, equipment is often destroyed, resulting in leakage, resulting in a large area of fire and explosion accidents.c, petrochemical production has a high degree of automation, closed, continuous characteristics. The production process conditions are increasingly harsh, the operation requirements are strict, coupled with the coexistence of new and old equipment, most of the equipment has been running for many years, the reliability is reduced, prone to malignant explosion accidents.d, the rapid development of the petrochemical industry, the continuous expansion of production scale, coupled with the lack of understanding of the explosion risk of new technology, the explosion protection design is not perfect, the loss of explosion accidents in operation will be very great Serious.