Main parameters of double beam bridge crane:
Lifting capacity: 5-10 tons, 16 / 3.2-50 / 10 tons, 75 / 20-100 / 20 tons, 100 / 32 tons, 125 / 30-250 / 50 tons, 300 / 40 tons, 350 / 75 tons, 400 / 80 tons, 600 / 150 tons
Span: 10.5-31.5m, 13-31m.
Lifting height: 6-22m.
https://www.dowell-cranes.com/overhead-crane/double-girder-overhead-cranes/european-electric-double-girder-overhead.html