(1) a boiler means enclosed equipment which heats the liquid it holds to a certain parameter and outputs thermo power by using various fuels, electricity or other energy resources. It ranges from pressure-bearing steam boiler with volume not less than 30 liters, pressure-bearing hot-water boiler with outlet water pressure not less than 0.1 MPa (gauge pressure) and rated power not less than 0.1MW, to organic fluid boiler.
(2) a pressure vessel means enclosed equipment which is capable of holding gas or liquid and carrying a certain pressure. It ranges from stationary vessel or transportable vessel for gas or liquefied gas whose maximum working pressure is not less than 0.1 MPa (gauge pressure) and the product of whose pressure multiplied by volume is not less than 2.5 MPa·L or for liquid whose maximum working temperature is no lower than its standard boiling point, gas cylinder for gas or liquefied gas whose nominal working pressure is not less than 0.2 MPa (gauge pressure) and the product of whose pressure multiplied by volume is not less than 1.0MPa·L or for liquid whose standard boiling point is not more than 60℃, or to hyperbaric oxygen chamber, etc.
(3) a pressure pipeline means pipe-shaped equipment which is capable of transmitting gas or liquid under certain pressure. It is used to transmit gas, liquefied gas, steam medium whose maximum working pressure is not less than 0.1 MPa (gauge pressure), or liquid media which are flammable, explosive, toxic, corrosive and whose maximum working temperature is no lower than the standard boiling point and whose nominal diameter is larger than 25mm.
(4) an elevator means a kind of power-driven machinery used to provide vertical or horizontal transportation of humans or commodities using cars moving along a rigid rail or step-type conveyer moving along fixed rail. It falls into passenger (cargo) elevator, escalator, and automatic moving walk, etc.
(5) a lifting appliance means a kind of machinery used to provide vertical or vertical/horizontal transportation of heavy goods. It ranges from lifter whose rated lifting capacity is not less than 0.5 ton, and crane whose rated lifting capacity is not less than one ton and whose lifting height is not less than two meters, to fixed electric hoist.
(6) a passenger ropeway means a kind of power-driven equipment which transports people by using flexible ropes to haul carriages, including passenger aerial ropeway, passenger trolley, and passenger towing cableway.
(7) a large amusement device means amusement equipment used to transport passengers for business purposes. It is restricted to that whose design maximum operating linear velocity is not less than two m/s or whose operating height is no lower than two meters.
(8) a non-road vehicle means a specialized motor vehicle operating in specific areas such as factory premises, tourist attractions and amusement places, excluding vehicles for road traffic and agriculture.
Special equipment also includes the materials used, auxiliary safety accessories, safety protection devices and other related facilities.