Top Running Overhead Bridge Cranes vs Under Running ‘Under Hung’ Overhead Bridge Cranes
Your application may require a single girder top running crane, a single girder under running crane (also known as an ‘Under Hung Bridge Crane’), a double girder top running crane or a double girder under running crane.
Top Running Single Girder Bridge Cranes
Provided in CMAA Class A (standby or infrequent service), Class B (light service), Class C (moderate service), Class D (heavy service).
Typical capacities range from 3 ton up to 35 ton with spans up to 90 feet. (Higher capacities and spans are available). Single girder bridge cranes are built from standard I-Beams or Wide Flange Beams, although but custom fabricated monobox, patented track or truss construction can be required. This is determined by an application specialist.
Single Girder Under Running Bridge Cranes
Provided in CMAA Class A, Class B, Class C, and Class D.
Under running bridge cranes are also widely known as underhung bridge cranes or underslung bridge cranes. These cranes can be provided in spans exceeding 80 feet and capacities up to 30 tons. Typically spans do not exceed 65 feet with capacities not exceeding more than 15 tons.
This solution is widely used when applications require loads to be transferred to a parallel bay. This is possible via the under hung bridge crane’s design which allows it to interlock and transfer the load to a monorail and then onto another crane, loading dock or area of your choosing. If your application requires the transferring of loads, your crane will most likely be required to use patented track. Although some applications allow for wide flange beams or use of standard I-beams.