Pressure vessel is a comprehensive product involving many industries and disciplines. Its construction technology involves many industries, such as metallurgy, mechanical processing, corrosion and anticorrosion, non-destructive testing, safety protection and so on. Pressure vessels are widely used in chemical industry, petroleum, machinery, power, metallurgy, nuclear energy, aviation, aerospace, marine and other sectors. It is an indispensable core equipment in the production process, and an important symbol of a country's equipment manufacturing level. For example, reactor, heat exchanger, shell of separator, gas-liquid tank, pressure shell of nuclear power reactor and steam drum in boiler system of power plant are all pressure vessels in chemical production. With the continuous progress of metallurgy, mechanical processing, welding and non-destructive testing technology.

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