Chemical equipment refers to devices that are stationary or equipped with a small number of transmission mechanisms in chemical production, mainly used to complete processes such as heat transfer, mass transfer, and chemical reactions, or for storing materials. Chemical equipment is usually classified in the following way. 1. According to structural characteristics and purposes, it is divided into: containers, towers, heat exchangers, reactors (including reactors, fixed beds or fluidized beds, and tube furnaces), separators, and storage devices. 2. According to materials, it is divided into metal equipment (carbon steel, alloy steel, cast iron, aluminum, copper, etc.) and non-metallic equipment (lined with rubber, plastic, refractory materials, enamel, etc.), among which carbon steel equipment is more commonly used. 3. According to the pressure situation, it is divided into external pressure equipment (including vacuum equipment) and internal pressure equipment. Internal pressure equipment is also divided into atmospheric pressure equipment (operating pressure<=0.7MPA), low pressure equipment (0.1 MPa<p<10MPA), medium pressure equipment (1.6 MPa<p10 MPA), high pressure equipment (10 MPa<p<100MPA), ultra-high pressure equipment (p>100MPA). 4. According to whether the equipment is stationary or not, it can be divided into static equipment and dynamic equipment. Static equipment (tower, kettle, heat exchanger, dryer, storage tank, etc.) Dynamic equipment (compressor, centrifuge, fan, pump, solid crushing machinery, etc.).