This document stipulates the type and basic parameters, technical requirements, experimental methods and inspection rules of annular electric single-girder cranes (hereinafter referred to as cranes). This document is applicable to general-purpose circular electric single-girder cranes using electric hoists as lifting mechanisms. Other forms or special-purpose cranes can also be used as a reference. This document does not apply to cranes working under the following environmental conditions:
——Explosive gas, combustible dust and corrosive gas environments;
——Lifting molten metal, flammable and explosive items.