Standard 2-runway, double girder Trambeam cranes are cataloged for rated lots to 15 tons and for spans to 100′. Multiple runway and heavier rated load cranes are available.
These cranes may be hand propelled, hand racked or motor driven depending on travel distance, frequency of operation, span, elevation and rated load. However, they are generally motor driven and that data that follows applies to motor driven cranes. When electric hoists operate on the crane, they are equipped with an electrification system.
Service classifications for cranes are described as ANSI MH 27.1specifications for Underhung Cranes and Monorail systems. Cataloged cranes will generally meet the service classification of the hoist selected to operate on the crane and the requirements of the comparable ANSI MH 27.1 service classification.