How do you calculate the load capacity of a Spreader Beam?

Spreader beams for cranes Ox Worldwide 5
Our MultiLug Beam at Football Club Barcelona
Capacity of a Spreader Beam | Ox Heavy lifting Equipment
Self powered trolleys Ox Worldwide.Main image.
Spreader beam Ox
DNV certificate for Ox Worldwide Cover
Transfer cars Ox Worldwide slider 3
Spreader beam 600 tons Ox Worldwide image