Special equipment refers to boilers, pressure vessels (including gas cylinders), pressure pipelines, elevators, lifting machinery, passenger ropeways, large amusement facilities, and specialized motor vehicles in factories that involve life safety and pose significant risks. Special equipment includes the materials used, accompanying safety accessories, safety protection devices, and facilities related to safety protection devices.

A boiler refers to a closed equipment that uses various fuels, electricity, or other energy sources to heat the contained liquid to a certain parameter and carry a certain pressure. Its scope is defined as a pressure steam boiler with a volume greater than or equal to 30L; Pressure bearing hot water boilers with an outlet water pressure greater than or equal to 0.1 MPa (gauge pressure) and a rated power greater than or equal to 0.1 MW; Organic heat carrier boiler.

Pressure vessel refers to a closed equipment that holds gases or liquids and carries a certain pressure. Its scope is defined as fixed and mobile containers for gases, liquefied gases, and liquids with a maximum working pressure greater than or equal to 0.1 MPa (gauge pressure) and a product of pressure and volume greater than or equal to 2.5 MPa · L, and a maximum working temperature greater than or equal to the standard boiling point; Gas cylinders containing gases with a nominal working pressure greater than or equal to 0.2 MPa (gauge pressure) and a product of pressure and volume greater than or equal to 1.0 MPa · L, liquefied gases, and liquids with a standard boiling point equal to or lower than 60 ℃; Oxygen chambers, etc.

Pressure pipeline refers to a tubular equipment used to transport gases or liquids under a certain pressure. Its scope is defined as gas, liquefied gas, steam medium with a maximum working pressure greater than or equal to 0.1 MPa (gauge pressure), or flammable, explosive, toxic, corrosive liquid medium with a maximum working temperature higher than or equal to the standard boiling point, and the nominal diameter is greater than 25mm.