Petrochemical industry is a pillar industry in China. In the process of petrochemical production, it needs to undergo many physical and chemical processes, mass transfer and heat transfer unit operation, and some process control conditions are extremely harsh. These harsh conditions put forward strict requirements for the manufacture, maintenance and personnel quality of petrochemical production equipment. Petrochemical production units are large-scale and single-series, with high automation, complex technology, equipment manufacturing and capital intensive. In some large-scale integrated plant areas, the devices are interrelated, so the selection of products is highly demanded. Local problems often affect the overall situation.